FTPClient

java.lang.Object
- com.fr.ftp.SocketClient
- - com.fr.ftp.client.FTP
  - - com.fr.ftp.client.FTPClient

所有已实现的接口:

Configurable

直接已知子类:

FTPHTTPClient, FTPSClient
```
public class FTPClient
extends FTP
implements Configurable
```
FTPClient encapsulates all the functionality necessary to store and retrieve files from an FTP server. This class takes care of all low level details of interacting with an FTP server and provides a convenient higher level interface. As with all classes derived from SocketClient, you must first connect to the server with connect before doing anything, and finally disconnect after you're completely finished interacting with the server. Then you need to check the FTP reply code to see if the connection was successful. For example:
```
    FTPClient ftp = new FTPClient();
    FTPClientConfig config = new FTPClientConfig();
    config.setXXX(YYY); // change required options
    // for example config.setServerTimeZoneId("Pacific/Pitcairn")
    ftp.configure(config );
    boolean error = false;
    try {
      int reply;
      String server = "ftp.example.com";
      ftp.connect(server);
      System.out.println("Connected to " + server + ".");
      System.out.print(ftp.getReplyString());

      // After connection attempt, you should check the reply code to verify
      // success.
      reply = ftp.getReplyCode();

      if(!FTPReply.isPositiveCompletion(reply)) {
        ftp.disconnect();
        System.err.println("FTP server refused connection.");
        System.exit(1);
      }
      ... // transfer files
      ftp.logout();
    } catch(IOException e) {
      error = true;
      e.printStackTrace();
    } finally {
      if(ftp.isConnected()) {
        try {
          ftp.disconnect();
        } catch(IOException ioe) {
          // do nothing
        }
      }
      System.exit(error ? 1 : 0);
    }
 
```
Immediately after connecting is the only real time you need to check the reply code (because connect is of type void). The convention for all the FTP command methods in FTPClient is such that they either return a boolean value or some other value. The boolean methods return true on a successful completion reply from the FTP server and false on a reply resulting in an error condition or failure. The methods returning a value other than boolean return a value containing the higher level data produced by the FTP command, or null if a reply resulted in an error condition or failure. If you want to access the exact FTP reply code causing a success or failure, you must call getReplyCode after a success or failure.
The default settings for FTPClient are for it to use FTP.ASCII_FILE_TYPE , FTP.NON_PRINT_TEXT_FORMAT , FTP.STREAM_TRANSFER_MODE , and FTP.FILE_STRUCTURE . The only file types directly supported are FTP.ASCII_FILE_TYPE and FTP.BINARY_FILE_TYPE . Because there are at least 4 different EBCDIC encodings, we have opted not to provide direct support for EBCDIC. To transfer EBCDIC and other unsupported file types you must create your own filter InputStreams and OutputStreams and wrap them around the streams returned or required by the FTPClient methods. FTPClient uses the NetASCII filter streams to provide transparent handling of ASCII files. We will consider incorporating EBCDIC support if there is enough demand.
FTP.NON_PRINT_TEXT_FORMAT , FTP.STREAM_TRANSFER_MODE , and FTP.FILE_STRUCTURE are the only supported formats, transfer modes, and file structures.
Because the handling of sockets on different platforms can differ significantly, the FTPClient automatically issues a new PORT (or EPRT) command prior to every transfer requiring that the server connect to the client's data port. This ensures identical problem-free behavior on Windows, Unix, and Macintosh platforms. Additionally, it relieves programmers from having to issue the PORT (or EPRT) command themselves and dealing with platform dependent issues.
Additionally, for security purposes, all data connections to the client are verified to ensure that they originated from the intended party (host and port). If a data connection is initiated by an unexpected party, the command will close the socket and throw an IOException. You may disable this behavior with setRemoteVerificationEnabled().
You should keep in mind that the FTP server may choose to prematurely close a connection if the client has been idle for longer than a given time period (usually 900 seconds). The FTPClient class will detect a premature FTP server connection closing when it receives a FTPReply.SERVICE_NOT_AVAILABLE response to a command. When that occurs, the FTP class method encountering that reply will throw an FTPConnectionClosedException . FTPConnectionClosedException is a subclass of IOException and therefore need not be caught separately, but if you are going to catch it separately, its catch block must appear before the more general IOException catch block. When you encounter an FTPConnectionClosedException , you must disconnect the connection with disconnect() to properly clean up the system resources used by FTPClient. Before disconnecting, you may check the last reply code and text with getReplyCode , getReplyString , and getReplyStrings. You may avoid server disconnections while the client is idle by periodically sending NOOP commands to the server.
Rather than list it separately for each method, we mention here that every method communicating with the server and throwing an IOException can also throw a MalformedServerReplyException , which is a subclass of IOException. A MalformedServerReplyException will be thrown when the reply received from the server deviates enough from the protocol specification that it cannot be interpreted in a useful manner despite attempts to be as lenient as possible.
Listing API Examples Both paged and unpaged examples of directory listings are available, as follows:
Unpaged (whole list) access, using a parser accessible by auto-detect:
```
    FTPClient f = new FTPClient();
    f.connect(server);
    f.login(username, password);
    FTPFile[] files = f.listFiles(directory);
 
```
Paged access, using a parser not accessible by auto-detect. The class defined in the first parameter of initateListParsing should be derived from com.fr.ftp.ftpFileEntryParser:
```
    FTPClient f = new FTPClient();
    f.connect(server);
    f.login(username, password);
    FTPListParseEngine engine =
       f.initiateListParsing("com.whatever.YourOwnParser", directory);

    while (engine.hasNext()) {
       FTPFile[] files = engine.getNext(25);  // "page size" you want
       //do whatever you want with these files, display them, etc.
       //expensive FTPFile objects not created until needed.
    }
 
```
Paged access, using a parser accessible by auto-detect:
```
    FTPClient f = new FTPClient();
    f.connect(server);
    f.login(username, password);
    FTPListParseEngine engine = f.initiateListParsing(directory);

    while (engine.hasNext()) {
       FTPFile[] files = engine.getNext(25);  // "page size" you want
       //do whatever you want with these files, display them, etc.
       //expensive FTPFile objects not created until needed.
    }
 
```
For examples of using FTPClient on servers whose directory listings
- use languages other than English
- use date formats other than the American English "standard" MM d yyyy
- are in different timezones and you need accurate timestamps for dependency checking as in Ant
see FTPClientConfig.
Control channel keep-alive feature:
Please note: this does not apply to the methods where the user is responsible for writing or reading the data stream, i.e. retrieveFileStream(String) , storeFileStream(String) and the other xxxFileStream methods
During file transfers, the data connection is busy, but the control connection is idle. FTP servers know that the control connection is in use, so won't close it through lack of activity, but it's a lot harder for network routers to know that the control and data connections are associated with each other. Some routers may treat the control connection as idle, and disconnect it if the transfer over the data connection takes longer than the allowable idle time for the router.
One solution to this is to send a safe command (i.e. NOOP) over the control connection to reset the router's idle timer. This is enabled as follows:
```
     ftpClient.setControlKeepAliveTimeout(300); // set timeout to 5 minutes
 
```
This will cause the file upload/download methods to send a NOOP approximately every 5 minutes. The following public methods support this:
This feature does not apply to the methods where the user is responsible for writing or reading the data stream, i.e. retrieveFileStream(String) , storeFileStream(String) and the other xxxFileStream methods. In such cases, the user is responsible for keeping the control connection alive if necessary.
The implementation currently uses a CopyStreamListener which is passed to the Util.copyStream(InputStream, OutputStream, int, long, CopyStreamListener, boolean) method, so the timing is partially dependent on how long each block transfer takes.
另请参阅:
FTP_SYSTEM_TYPE, SYSTEM_TYPE_PROPERTIES, FTP, FTPConnectionClosedException, FTPFileEntryParser, FTPFileEntryParserFactory, DefaultFTPFileEntryParserFactory, FTPClientConfig, MalformedServerReplyException

嵌套类概要

嵌套类
限定符和类型	类和说明
`static interface`	`FTPClient.HostnameResolver` Strategy interface for updating host names received from FTP server for passive NAT workaround.
`static class`	`FTPClient.NatServerResolverImpl` Default strategy for passive NAT workaround (site-local replies are replaced.)

字段概要

字段
限定符和类型	字段和说明
`static int`	`ACTIVE_LOCAL_DATA_CONNECTION_MODE` A constant indicating the FTP session is expecting all transfers to occur between the client (local) and server and that the server should connect to the client's data port to initiate a data transfer.
`static int`	`ACTIVE_REMOTE_DATA_CONNECTION_MODE` A constant indicating the FTP session is expecting all transfers to occur between two remote servers and that the server the client is connected to should connect to the other server's data port to initiate a data transfer.
`static java.lang.String`	`FTP_SYSTEM_TYPE` The system property ("com.fr.ftp.ftp.systemType") which can be used to override the system type.
`static java.lang.String`	`FTP_SYSTEM_TYPE_DEFAULT` The system property ("com.fr.ftp.ftp.systemType.default") which can be used as the default system type.
`static int`	`PASSIVE_LOCAL_DATA_CONNECTION_MODE` A constant indicating the FTP session is expecting all transfers to occur between the client (local) and server and that the server is in passive mode, requiring the client to connect to the server's data port to initiate a transfer.
`static int`	`PASSIVE_REMOTE_DATA_CONNECTION_MODE` A constant indicating the FTP session is expecting all transfers to occur between two remote servers and that the server the client is connected to is in passive mode, requiring the other server to connect to the first server's data port to initiate a data transfer.
`static java.lang.String`	`SYSTEM_TYPE_PROPERTIES` The name of an optional systemType properties file ("/systemType.properties"), which is loaded using `Class.getResourceAsStream(String)`.

从类继承的字段 com.fr.ftp.SocketClient
_defaultPort_, _hostname_, _input_, _output_, _serverSocketFactory_, _socket_, _socketFactory_, _timeout_, connectTimeout, NETASCII_EOL

构造器概要

构造器
构造器和说明

FTPClient()
Default FTPClient constructor.

构造器
构造器和说明
`FTPClient()` Default FTPClient constructor.

方法概要

方法
限定符和类型	方法和说明
`protected void`	`_connectAction_()` Initiates control connections and gets initial reply.
`protected void`	`_connectAction_(java.io.Reader socketIsReader)` Initiates control connections and gets initial reply.
`protected java.net.Socket`	`_openDataConnection_(FTPCmd command, java.lang.String arg)` Establishes a data connection with the FTP server, returning a Socket for the connection if successful.
`protected java.net.Socket`	`_openDataConnection_(java.lang.String command, java.lang.String arg)` Establishes a data connection with the FTP server, returning a Socket for the connection if successful.
`protected void`	`_parseExtendedPassiveModeReply(java.lang.String reply)`
`protected void`	`_parsePassiveModeReply(java.lang.String reply)`
`protected boolean`	`_retrieveFile(java.lang.String command, java.lang.String remote, java.io.OutputStream local)`
`protected java.io.InputStream`	`_retrieveFileStream(java.lang.String command, java.lang.String remote)`
`protected boolean`	`_storeFile(java.lang.String command, java.lang.String remote, java.io.InputStream local)`
`protected java.io.OutputStream`	`_storeFileStream(java.lang.String command, java.lang.String remote)`
`boolean`	`abort()` Abort a transfer in progress.
`boolean`	`allocate(int bytes)` Reserve a number of bytes on the server for the next file transfer.
`boolean`	`allocate(int bytes, int recordSize)` Reserve space on the server for the next file transfer.
`boolean`	`appendFile(java.lang.String remote, java.io.InputStream local)` Appends to a file on the server with the given name, taking input from the given InputStream.
`java.io.OutputStream`	`appendFileStream(java.lang.String remote)` Returns an OutputStream through which data can be written to append to a file on the server with the given name.
`boolean`	`changeToParentDirectory()` Change to the parent directory of the current working directory.
`boolean`	`changeWorkingDirectory(java.lang.String pathname)` Change the current working directory of the FTP session.
`boolean`	`completePendingCommand()` There are a few FTPClient methods that do not complete the entire sequence of FTP commands to complete a transaction.
`void`	`configure(FTPClientConfig config)` Implementation of the `Configurable` interface.
`boolean`	`deleteFile(java.lang.String pathname)` Deletes a file on the FTP server.
`void`	`disconnect()` Closes the connection to the FTP server and restores connection parameters to the default values.
`boolean`	`doCommand(java.lang.String command, java.lang.String params)` Issue a command and wait for the reply.
`java.lang.String[]`	`doCommandAsStrings(java.lang.String command, java.lang.String params)` Issue a command and wait for the reply, returning it as an array of strings.
`void`	`enterLocalActiveMode()` Set the current data connection mode to `ACTIVE_LOCAL_DATA_CONNECTION_MODE`.
`void`	`enterLocalPassiveMode()` Set the current data connection mode to `PASSIVE_LOCAL_DATA_CONNECTION_MODE` .
`boolean`	`enterRemoteActiveMode(java.net.InetAddress host, int port)` Set the current data connection mode to `ACTIVE_REMOTE_DATA_CONNECTION` .
`boolean`	`enterRemotePassiveMode()` Set the current data connection mode to `PASSIVE_REMOTE_DATA_CONNECTION_MODE` .
`boolean`	`features()` Query the server for supported features.
`java.lang.String`	`featureValue(java.lang.String feature)` Query the server for a supported feature, and returns the its value (if any).
`java.lang.String[]`	`featureValues(java.lang.String feature)` Query the server for a supported feature, and returns its values (if any).
`boolean`	`getAutodetectUTF8()` Tells if automatic server encoding detection is enabled or disabled.
`int`	`getBufferSize()` Retrieve the current internal buffer size for buffered data streams.
`int`	`getControlKeepAliveReplyTimeout()` Get how long to wait for control keep-alive message replies.
`long`	`getControlKeepAliveTimeout()` Get the time to wait between sending control connection keepalive messages.
`CopyStreamListener`	`getCopyStreamListener()` Obtain the currently active listener.
`int`	`getDataConnectionMode()` Returns the current data connection mode (one of the `_DATA_CONNECTION_MODE` constants.
`protected java.lang.String`	`getListArguments(java.lang.String pathname)`
`boolean`	`getListHiddenFiles()`
`java.lang.String`	`getModificationTime(java.lang.String pathname)` Issue the FTP MDTM command (not supported by all servers) to retrieve the last modification time of a file.
`java.lang.String`	`getPassiveHost()` Returns the hostname or IP address (in the form of a string) returned by the server when entering passive mode.
`java.net.InetAddress`	`getPassiveLocalIPAddress()` Set the local IP address in passive mode.
`int`	`getPassivePort()` If in passive mode, returns the data port of the passive host.
`int`	`getReceiveDataSocketBufferSize()` Retrieve the value to be used for the data socket SO_RCVBUF option.
`long`	`getRestartOffset()` Fetches the restart offset.
`int`	`getSendDataSocketBufferSize()` Retrieve the value to be used for the data socket SO_SNDBUF option.
`java.lang.String`	`getStatus()` Issue the FTP STAT command to the server.
`java.lang.String`	`getStatus(java.lang.String pathname)` Issue the FTP STAT command to the server for a given pathname.
`java.lang.String`	`getSystemType()` Fetches the system type from the server and returns the string.
`boolean`	`hasFeature(java.lang.String feature)` Query the server for a supported feature.
`boolean`	`hasFeature(java.lang.String feature, java.lang.String value)` Query the server for a supported feature with particular value, for example "AUTH SSL" or "AUTH TLS".
`FTPListParseEngine`	`initiateListParsing()` Using the default autodetect mechanism, initialize an FTPListParseEngine object containing a raw file information for the current working directory on the server This information is obtained through the LIST command.
`FTPListParseEngine`	`initiateListParsing(java.lang.String pathname)` Using the default autodetect mechanism, initialize an FTPListParseEngine object containing a raw file information for the supplied directory.
`FTPListParseEngine`	`initiateListParsing(java.lang.String parserKey, java.lang.String pathname)` Using the supplied parser key, initialize an FTPListParseEngine object containing a raw file information for the supplied directory.
`boolean`	`isRemoteVerificationEnabled()` Return whether or not verification of the remote host participating in data connections is enabled.
`boolean`	`isUseEPSVwithIPv4()` Whether should attempt to use EPSV with IPv4.
`FTPFile[]`	`listDirectories()` Using the default system autodetect mechanism, obtain a list of directories contained in the current working directory.
`FTPFile[]`	`listDirectories(java.lang.String parent)` Using the default system autodetect mechanism, obtain a list of directories contained in the specified directory.
`FTPFile[]`	`listFiles()` Using the default system autodetect mechanism, obtain a list of file information for the current working directory.
`FTPFile[]`	`listFiles(java.lang.String pathname)` Using the default system autodetect mechanism, obtain a list of file information for the current working directory or for just a single file.
`FTPFile[]`	`listFiles(java.lang.String pathname, FTPFileFilter filter)` Version of `listFiles(String)` which allows a filter to be provided.
`java.lang.String`	`listHelp()` Fetches the system help information from the server and returns the full string.
`java.lang.String`	`listHelp(java.lang.String command)` Fetches the help information for a given command from the server and returns the full string.
`java.lang.String[]`	`listNames()` Obtain a list of filenames in the current working directory This information is obtained through the NLST command.
`java.lang.String[]`	`listNames(java.lang.String pathname)` Obtain a list of filenames in a directory (or just the name of a given file, which is not particularly useful).
`boolean`	`login(java.lang.String username, java.lang.String password)` Login to the FTP server using the provided username and password.
`boolean`	`login(java.lang.String username, java.lang.String password, java.lang.String account)` Login to the FTP server using the provided username, password, and account.
`boolean`	`logout()` Logout of the FTP server by sending the QUIT command.
`boolean`	`makeDirectory(java.lang.String pathname)` Creates a new subdirectory on the FTP server in the current directory (if a relative pathname is given) or where specified (if an absolute pathname is given).
`FTPFile`	`mdtmFile(java.lang.String pathname)` Issue the FTP MDTM command (not supported by all servers) to retrieve the last modification time of a file.
`FTPFile[]`	`mlistDir()` Generate a directory listing for the current directory using the MLSD command.
`FTPFile[]`	`mlistDir(java.lang.String pathname)` Generate a directory listing using the MLSD command.
`FTPFile[]`	`mlistDir(java.lang.String pathname, FTPFileFilter filter)` Generate a directory listing using the MLSD command.
`FTPFile`	`mlistFile(java.lang.String pathname)` Get file details using the MLST command
`java.lang.String`	`printWorkingDirectory()` Returns the pathname of the current working directory.
`boolean`	`reinitialize()` Reinitialize the FTP session.
`boolean`	`remoteAppend(java.lang.String filename)` Initiate a server to server file transfer.
`boolean`	`remoteRetrieve(java.lang.String filename)` Initiate a server to server file transfer.
`boolean`	`remoteStore(java.lang.String filename)` Initiate a server to server file transfer.
`boolean`	`remoteStoreUnique()` Initiate a server to server file transfer.
`boolean`	`remoteStoreUnique(java.lang.String filename)` Initiate a server to server file transfer.
`boolean`	`removeDirectory(java.lang.String pathname)` Removes a directory on the FTP server (if empty).
`boolean`	`rename(java.lang.String from, java.lang.String to)` Renames a remote file.
`protected boolean`	`restart(long offset)` Restart a `STREAM_TRANSFER_MODE` file transfer starting from the given offset.
`boolean`	`retrieveFile(java.lang.String remote, java.io.OutputStream local)` Retrieves a named file from the server and writes it to the given OutputStream.
`java.io.InputStream`	`retrieveFileStream(java.lang.String remote)` Returns an InputStream from which a named file from the server can be read.
`boolean`	`sendNoOp()` Sends a NOOP command to the FTP server.
`boolean`	`sendSiteCommand(java.lang.String arguments)` Send a site specific command.
`void`	`setActiveExternalIPAddress(java.lang.String ipAddress)` Set the external IP address in active mode.
`void`	`setActivePortRange(int minPort, int maxPort)` Set the client side port range in active mode.
`void`	`setAutodetectUTF8(boolean autodetect)` Enables or disables automatic server encoding detection (only UTF-8 supported).
`void`	`setBufferSize(int bufSize)` Set the internal buffer size for buffered data streams.
`void`	`setControlKeepAliveReplyTimeout(int timeout)` Set how long to wait for control keep-alive message replies.
`void`	`setControlKeepAliveTimeout(long controlIdle)` Set the time to wait between sending control connection keepalive messages when processing file upload or download.
`void`	`setCopyStreamListener(CopyStreamListener listener)` Set the listener to be used when performing store/retrieve operations.
`void`	`setDataTimeout(int timeout)` Sets the timeout in milliseconds to use when reading from the data connection.
`boolean`	`setFileStructure(int structure)` Sets the file structure.
`boolean`	`setFileTransferMode(int mode)` Sets the transfer mode.
`boolean`	`setFileType(int fileType)` Sets the file type to be transferred.
`boolean`	`setFileType(int fileType, int formatOrByteSize)` Sets the file type to be transferred and the format.
`void`	`setListHiddenFiles(boolean listHiddenFiles)` You can set this to true if you would like to get hidden files when `listFiles(java.lang.String)` too.
`boolean`	`setModificationTime(java.lang.String pathname, java.lang.String timeval)` Issue the FTP MFMT command (not supported by all servers) which sets the last modified time of a file.
`void`	`setParserFactory(FTPFileEntryParserFactory parserFactory)` set the factory used for parser creation to the supplied factory object.
`void`	`setPassiveLocalIPAddress(java.net.InetAddress inetAddress)` Set the local IP address to use in passive mode.
`void`	`setPassiveLocalIPAddress(java.lang.String ipAddress)` Set the local IP address to use in passive mode.
`void`	`setPassiveNatWorkaroundStrategy(FTPClient.HostnameResolver resolver)` Set the workaround strategy to replace the PASV mode reply addresses.
`void`	`setReceieveDataSocketBufferSize(int bufSize)` Sets the value to be used for the data socket SO_RCVBUF option.
`void`	`setRemoteVerificationEnabled(boolean enable)` Enable or disable verification that the remote host taking part of a data connection is the same as the host to which the control connection is attached.
`void`	`setReportActiveExternalIPAddress(java.lang.String ipAddress)` Set the external IP address to report in EPRT/PORT commands in active mode.
`void`	`setRestartOffset(long offset)` Sets the restart offset for file transfers.
`void`	`setSendDataSocketBufferSize(int bufSize)` Sets the value to be used for the data socket SO_SNDBUF option.
`void`	`setUseEPSVwithIPv4(boolean selected)` Set whether to use EPSV with IPv4.
`boolean`	`storeFile(java.lang.String remote, java.io.InputStream local)` Stores a file on the server using the given name and taking input from the given InputStream.
`java.io.OutputStream`	`storeFileStream(java.lang.String remote)` Returns an OutputStream through which data can be written to store a file on the server using the given name.
`boolean`	`storeUniqueFile(java.io.InputStream local)` Stores a file on the server using a unique name assigned by the server and taking input from the given InputStream.
`boolean`	`storeUniqueFile(java.lang.String remote, java.io.InputStream local)` Stores a file on the server using a unique name derived from the given name and taking input from the given InputStream.
`java.io.OutputStream`	`storeUniqueFileStream()` Returns an OutputStream through which data can be written to store a file on the server using a unique name assigned by the server.
`java.io.OutputStream`	`storeUniqueFileStream(java.lang.String remote)` Returns an OutputStream through which data can be written to store a file on the server using a unique name derived from the given name.
`boolean`	`structureMount(java.lang.String pathname)` Issue the FTP SMNT command.

从类继承的方法 com.fr.ftp.client.FTP
__getReplyNoReport, __noop, abor, acct, allo, allo, appe, cdup, cwd, dele, eprt, epsv, feat, getCommandSupport, getControlEncoding, getReply, getReplyCode, getReplyString, getReplyStrings, help, help, isStrictMultilineParsing, isStrictReplyParsing, list, list, mdtm, mfmt, mkd, mlsd, mlsd, mlst, mlst, mode, nlst, nlst, noop, pass, pasv, port, pwd, quit, rein, rest, retr, rmd, rnfr, rnto, sendCommand, sendCommand, sendCommand, sendCommand, setControlEncoding, setStrictMultilineParsing, setStrictReplyParsing, site, smnt, stat, stat, stor, stou, stou, stru, syst, type, type, user

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - FTP_SYSTEM_TYPE
```
public static final java.lang.String FTP_SYSTEM_TYPE
```
    The system property ("com.fr.ftp.ftp.systemType") which can be used to override the system type.
    If defined, the value will be used to create any automatically created parsers.
    
    从以下版本开始:
    
    3.0
    
    另请参阅:
    常量字段值
  - FTP_SYSTEM_TYPE_DEFAULT
```
public static final java.lang.String FTP_SYSTEM_TYPE_DEFAULT
```
    The system property ("com.fr.ftp.ftp.systemType.default") which can be used as the default system type.
    If defined, the value will be used if the SYST command fails.
    
    从以下版本开始:
    
    3.1
    
    另请参阅:
    常量字段值
  - SYSTEM_TYPE_PROPERTIES
```
public static final java.lang.String SYSTEM_TYPE_PROPERTIES
```
    The name of an optional systemType properties file ("/systemType.properties"), which is loaded using Class.getResourceAsStream(String).
    The entries are the systemType (as determined by getSystemType()) and the values are the replacement type or parserClass, which is passed to FTPFileEntryParserFactory.createFileEntryParser(String).
    For example:
```
 Plan 9=Unix
 OS410=com.fr.ftp.ftp.parser.OS400FTPEntryParser
 
```
    从以下版本开始:
    
    3.0
    
    另请参阅:
    常量字段值
  - ACTIVE_LOCAL_DATA_CONNECTION_MODE
```
public static final int ACTIVE_LOCAL_DATA_CONNECTION_MODE
```
    A constant indicating the FTP session is expecting all transfers to occur between the client (local) and server and that the server should connect to the client's data port to initiate a data transfer. This is the default data connection mode when and FTPClient instance is created.
    
    另请参阅:
    常量字段值
  - ACTIVE_REMOTE_DATA_CONNECTION_MODE
```
public static final int ACTIVE_REMOTE_DATA_CONNECTION_MODE
```
    A constant indicating the FTP session is expecting all transfers to occur between two remote servers and that the server the client is connected to should connect to the other server's data port to initiate a data transfer.
    
    另请参阅:
    常量字段值
  - PASSIVE_LOCAL_DATA_CONNECTION_MODE
```
public static final int PASSIVE_LOCAL_DATA_CONNECTION_MODE
```
    A constant indicating the FTP session is expecting all transfers to occur between the client (local) and server and that the server is in passive mode, requiring the client to connect to the server's data port to initiate a transfer.
    
    另请参阅:
    常量字段值
  - PASSIVE_REMOTE_DATA_CONNECTION_MODE
```
public static final int PASSIVE_REMOTE_DATA_CONNECTION_MODE
```
    A constant indicating the FTP session is expecting all transfers to occur between two remote servers and that the server the client is connected to is in passive mode, requiring the other server to connect to the first server's data port to initiate a data transfer.
    
    另请参阅:
    常量字段值
- 构造器详细资料
  - FTPClient
```
public FTPClient()
```
    Default FTPClient constructor. Creates a new FTPClient instance with the data connection mode set to ACTIVE_LOCAL_DATA_CONNECTION_MODE , the file type set to FTP.ASCII_FILE_TYPE , the file format set to FTP.NON_PRINT_TEXT_FORMAT , the file structure set to FTP.FILE_STRUCTURE , and the transfer mode set to FTP.STREAM_TRANSFER_MODE .
    The list parsing auto-detect feature can be configured to use lenient future dates (short dates may be up to one day in the future) as follows:
```
 FTPClient ftp = new FTPClient();
 FTPClientConfig config = new FTPClientConfig();
 config.setLenientFutureDates(true);
 ftp.configure(config );
 
```
- 方法详细资料
  - _parsePassiveModeReply
```
protected void _parsePassiveModeReply(java.lang.String reply)
                               throws MalformedServerReplyException
```
    参数:
    reply - the reply to parse
    
    抛出:
    
    MalformedServerReplyException - if the server reply does not match (n,n,n,n),(n),(n)
    从以下版本开始:
    
    3.1
  - _parseExtendedPassiveModeReply
```
protected void _parseExtendedPassiveModeReply(java.lang.String reply)
                                       throws MalformedServerReplyException
```
    抛出:
    
    MalformedServerReplyException
  - _storeFile
```
protected boolean _storeFile(java.lang.String command,
                 java.lang.String remote,
                 java.io.InputStream local)
                      throws java.io.IOException
```
    参数:
    command - the command to send
    remote - the remote file name
    local - the local file name
    
    返回:
    true if successful
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.1
  - _storeFileStream
```
protected java.io.OutputStream _storeFileStream(java.lang.String command,
                                    java.lang.String remote)
                                         throws java.io.IOException
```
    参数:
    command - the command to send
    remote - the remote file name
    
    返回:
    the output stream to write to
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.1
  - _openDataConnection_
```
protected java.net.Socket _openDataConnection_(FTPCmd command,
                                   java.lang.String arg)
                                        throws java.io.IOException
```
    Establishes a data connection with the FTP server, returning a Socket for the connection if successful. If a restart offset has been set with setRestartOffset(long), a REST command is issued to the server with the offset as an argument before establishing the data connection. Active mode connections also cause a local PORT command to be issued.
    
    参数:
    command - The int representation of the FTP command to send.
    arg - The arguments to the FTP command. If this parameter is set to null, then the command is sent with no argument.
    
    返回:
    A Socket corresponding to the established data connection. Null is returned if an FTP protocol error is reported at any point during the establishment and initialization of the connection.
    
    抛出:
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    从以下版本开始:
    
    3.3
  - _openDataConnection_
```
protected java.net.Socket _openDataConnection_(java.lang.String command,
                                   java.lang.String arg)
                                        throws java.io.IOException
```
    Establishes a data connection with the FTP server, returning a Socket for the connection if successful. If a restart offset has been set with setRestartOffset(long), a REST command is issued to the server with the offset as an argument before establishing the data connection. Active mode connections also cause a local PORT command to be issued.
    
    参数:
    command - The text representation of the FTP command to send.
    arg - The arguments to the FTP command. If this parameter is set to null, then the command is sent with no argument.
    
    返回:
    A Socket corresponding to the established data connection. Null is returned if an FTP protocol error is reported at any point during the establishment and initialization of the connection.
    
    抛出:
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    从以下版本开始:
    
    3.1
  - _connectAction_
```
protected void _connectAction_()
                        throws java.io.IOException
```
    从类复制的说明: FTP
    
    Initiates control connections and gets initial reply. Initializes FTP._controlInput_ and FTP._controlOutput_.
    
    覆盖:
    
    _connectAction_ 在类中 FTP
    
    抛出:
    
    java.io.IOException - (SocketException) if a problem occurs with the socket
  - _connectAction_
```
protected void _connectAction_(java.io.Reader socketIsReader)
                        throws java.io.IOException
```
    从类复制的说明: FTP
    
    Initiates control connections and gets initial reply. Initializes FTP._controlInput_ and FTP._controlOutput_.
    
    覆盖:
    
    _connectAction_ 在类中 FTP
    
    参数:
    socketIsReader - the reader to reuse (if non-null)
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.4
  - setDataTimeout
```
public void setDataTimeout(int timeout)
```
    Sets the timeout in milliseconds to use when reading from the data connection. This timeout will be set immediately after opening the data connection, provided that the value is ≥ 0.
    Note: the timeout will also be applied when calling accept() whilst establishing an active local data connection.
    
    参数:
    timeout - The default timeout in milliseconds that is used when opening a data connection socket. The value 0 means an infinite timeout.
  - setParserFactory
```
public void setParserFactory(FTPFileEntryParserFactory parserFactory)
```
    set the factory used for parser creation to the supplied factory object.
    
    参数:
    parserFactory - factory object used to create FTPFileEntryParsers
    另请参阅:
    FTPFileEntryParserFactory, DefaultFTPFileEntryParserFactory
  - disconnect
```
public void disconnect()
                throws java.io.IOException
```
    Closes the connection to the FTP server and restores connection parameters to the default values.
    
    覆盖:
    
    disconnect 在类中 FTP
    
    抛出:
    
    java.io.IOException - If an error occurs while disconnecting.
  - setRemoteVerificationEnabled
```
public void setRemoteVerificationEnabled(boolean enable)
```
    Enable or disable verification that the remote host taking part of a data connection is the same as the host to which the control connection is attached. The default is for verification to be enabled. You may set this value at any time, whether the FTPClient is currently connected or not.
    
    参数:
    enable - True to enable verification, false to disable verification.
  - isRemoteVerificationEnabled
```
public boolean isRemoteVerificationEnabled()
```
    Return whether or not verification of the remote host participating in data connections is enabled. The default behavior is for verification to be enabled.
    
    返回:
    True if verification is enabled, false if not.
  - login
```
public boolean login(java.lang.String username,
            java.lang.String password)
              throws java.io.IOException
```
    Login to the FTP server using the provided username and password.
    
    参数:
    username - The username to login under.
    password - The password to use.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - login
```
public boolean login(java.lang.String username,
            java.lang.String password,
            java.lang.String account)
              throws java.io.IOException
```
    Login to the FTP server using the provided username, password, and account. If no account is required by the server, only the username and password, the account information is not used.
    
    参数:
    username - The username to login under.
    password - The password to use.
    account - The account to use.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - logout
```
public boolean logout()
               throws java.io.IOException
```
    Logout of the FTP server by sending the QUIT command.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - changeWorkingDirectory
```
public boolean changeWorkingDirectory(java.lang.String pathname)
                               throws java.io.IOException
```
    Change the current working directory of the FTP session.
    
    参数:
    pathname - The new current working directory.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - changeToParentDirectory
```
public boolean changeToParentDirectory()
                                throws java.io.IOException
```
    Change to the parent directory of the current working directory.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - structureMount
```
public boolean structureMount(java.lang.String pathname)
                       throws java.io.IOException
```
    Issue the FTP SMNT command.
    
    参数:
    pathname - The pathname to mount.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - reinitialize
```
public boolean reinitialize()
                     throws java.io.IOException
```
    Reinitialize the FTP session. Not all FTP servers support this command, which issues the FTP REIN command.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    从以下版本开始:
    
    3.4 (made public)
  - enterLocalActiveMode
```
public void enterLocalActiveMode()
```
    Set the current data connection mode to ACTIVE_LOCAL_DATA_CONNECTION_MODE. No communication with the FTP server is conducted, but this causes all future data transfers to require the FTP server to connect to the client's data port. Additionally, to accommodate differences between socket implementations on different platforms, this method causes the client to issue a PORT command before every data transfer.
  - enterLocalPassiveMode
```
public void enterLocalPassiveMode()
```
    Set the current data connection mode to PASSIVE_LOCAL_DATA_CONNECTION_MODE . Use this method only for data transfers between the client and server. This method causes a PASV (or EPSV) command to be issued to the server before the opening of every data connection, telling the server to open a data port to which the client will connect to conduct data transfers. The FTPClient will stay in PASSIVE_LOCAL_DATA_CONNECTION_MODE until the mode is changed by calling some other method such as enterLocalActiveMode()
    N.B. currently calling any connect method will reset the mode to ACTIVE_LOCAL_DATA_CONNECTION_MODE.
  - enterRemoteActiveMode
```
public boolean enterRemoteActiveMode(java.net.InetAddress host,
                            int port)
                              throws java.io.IOException
```
    Set the current data connection mode to ACTIVE_REMOTE_DATA_CONNECTION . Use this method only for server to server data transfers. This method issues a PORT command to the server, indicating the other server and port to which it should connect for data transfers. You must call this method before EVERY server to server transfer attempt. The FTPClient will NOT automatically continue to issue PORT commands. You also must remember to call enterLocalActiveMode() if you wish to return to the normal data connection mode.
    
    参数:
    host - The passive mode server accepting connections for data transfers.
    port - The passive mode server's data port.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - enterRemotePassiveMode
```
public boolean enterRemotePassiveMode()
                               throws java.io.IOException
```
    Set the current data connection mode to PASSIVE_REMOTE_DATA_CONNECTION_MODE . Use this method only for server to server data transfers. This method issues a PASV command to the server, telling it to open a data port to which the active server will connect to conduct data transfers. You must call this method before EVERY server to server transfer attempt. The FTPClient will NOT automatically continue to issue PASV commands. You also must remember to call enterLocalActiveMode() if you wish to return to the normal data connection mode.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - getPassiveHost
```
public java.lang.String getPassiveHost()
```
    Returns the hostname or IP address (in the form of a string) returned by the server when entering passive mode. If not in passive mode, returns null. This method only returns a valid value AFTER a data connection has been opened after a call to enterLocalPassiveMode(). This is because FTPClient sends a PASV command to the server only just before opening a data connection, and not when you call enterLocalPassiveMode().
    
    返回:
    The passive host name if in passive mode, otherwise null.
  - getPassivePort
```
public int getPassivePort()
```
    If in passive mode, returns the data port of the passive host. This method only returns a valid value AFTER a data connection has been opened after a call to enterLocalPassiveMode(). This is because FTPClient sends a PASV command to the server only just before opening a data connection, and not when you call enterLocalPassiveMode().
    
    返回:
    The data port of the passive server. If not in passive mode, undefined.
  - getDataConnectionMode
```
public int getDataConnectionMode()
```
    Returns the current data connection mode (one of the _DATA_CONNECTION_MODE constants.
    
    返回:
    The current data connection mode (one of the _DATA_CONNECTION_MODE constants.
  - setActivePortRange
```
public void setActivePortRange(int minPort,
                      int maxPort)
```
    Set the client side port range in active mode.
    
    参数:
    minPort - The lowest available port (inclusive).
    maxPort - The highest available port (inclusive).
    从以下版本开始:
    
    2.2
  - setActiveExternalIPAddress
```
public void setActiveExternalIPAddress(java.lang.String ipAddress)
                                throws java.net.UnknownHostException
```
    Set the external IP address in active mode. Useful when there are multiple network cards.
    
    参数:
    ipAddress - The external IP address of this machine.
    
    抛出:
    
    java.net.UnknownHostException - if the ipAddress cannot be resolved
    从以下版本开始:
    
    2.2
  - setPassiveLocalIPAddress
```
public void setPassiveLocalIPAddress(java.lang.String ipAddress)
                              throws java.net.UnknownHostException
```
    Set the local IP address to use in passive mode. Useful when there are multiple network cards.
    
    参数:
    ipAddress - The local IP address of this machine.
    
    抛出:
    
    java.net.UnknownHostException - if the ipAddress cannot be resolved
  - setPassiveLocalIPAddress
```
public void setPassiveLocalIPAddress(java.net.InetAddress inetAddress)
```
    Set the local IP address to use in passive mode. Useful when there are multiple network cards.
    
    参数:
    inetAddress - The local IP address of this machine.
  - getPassiveLocalIPAddress
```
public java.net.InetAddress getPassiveLocalIPAddress()
```
    Set the local IP address in passive mode. Useful when there are multiple network cards.
    
    返回:
    The local IP address in passive mode.
  - setReportActiveExternalIPAddress
```
public void setReportActiveExternalIPAddress(java.lang.String ipAddress)
                                      throws java.net.UnknownHostException
```
    Set the external IP address to report in EPRT/PORT commands in active mode. Useful when there are multiple network cards.
    
    参数:
    ipAddress - The external IP address of this machine.
    
    抛出:
    
    java.net.UnknownHostException - if the ipAddress cannot be resolved
    从以下版本开始:
    
    3.1
    
    另请参阅:
    getReportHostAddress()
  - setFileType
```
public boolean setFileType(int fileType)
                    throws java.io.IOException
```
    Sets the file type to be transferred. This should be one of FTP.ASCII_FILE_TYPE , FTP.BINARY_FILE_TYPE, etc. The file type only needs to be set when you want to change the type. After changing it, the new type stays in effect until you change it again. The default file type is FTP.ASCII_FILE_TYPE if this method is never called.
    The server default is supposed to be ASCII (see RFC 959), however many ftp servers default to BINARY. To ensure correct operation with all servers, always specify the appropriate file type after connecting to the server.
    
    N.B. currently calling any connect method will reset the type to FTP.ASCII_FILE_TYPE.
    
    参数:
    fileType - The _FILE_TYPE constant indcating the type of file.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - setFileType
```
public boolean setFileType(int fileType,
                  int formatOrByteSize)
                    throws java.io.IOException
```
    Sets the file type to be transferred and the format. The type should be one of FTP.ASCII_FILE_TYPE , FTP.BINARY_FILE_TYPE , etc. The file type only needs to be set when you want to change the type. After changing it, the new type stays in effect until you change it again. The default file type is FTP.ASCII_FILE_TYPE if this method is never called.
    The server default is supposed to be ASCII (see RFC 959), however many ftp servers default to BINARY. To ensure correct operation with all servers, always specify the appropriate file type after connecting to the server.
    The format should be one of the FTP class TEXT_FORMAT constants, or if the type is FTP.LOCAL_FILE_TYPE , the format should be the byte size for that type. The default format is FTP.NON_PRINT_TEXT_FORMAT if this method is never called.
    N.B. currently calling any connect method will reset the type to FTP.ASCII_FILE_TYPE and the formatOrByteSize to FTP.NON_PRINT_TEXT_FORMAT.
    
    参数:
    fileType - The _FILE_TYPE constant indcating the type of file.
    formatOrByteSize - The format of the file (one of the _FORMAT constants. In the case of LOCAL_FILE_TYPE, the byte size.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - setFileStructure
```
public boolean setFileStructure(int structure)
                         throws java.io.IOException
```
    Sets the file structure. The default structure is FTP.FILE_STRUCTURE if this method is never called or if a connect method is called.
    
    参数:
    structure - The structure of the file (one of the FTP class _STRUCTURE constants).
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - setFileTransferMode
```
public boolean setFileTransferMode(int mode)
                            throws java.io.IOException
```
    Sets the transfer mode. The default transfer mode FTP.STREAM_TRANSFER_MODE if this method is never called or if a connect method is called.
    
    参数:
    mode - The new transfer mode to use (one of the FTP class _TRANSFER_MODE constants).
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - remoteRetrieve
```
public boolean remoteRetrieve(java.lang.String filename)
                       throws java.io.IOException
```
    Initiate a server to server file transfer. This method tells the server to which the client is connected to retrieve a given file from the other server.
    
    参数:
    filename - The name of the file to retrieve.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - remoteStore
```
public boolean remoteStore(java.lang.String filename)
                    throws java.io.IOException
```
    Initiate a server to server file transfer. This method tells the server to which the client is connected to store a file on the other server using the given filename. The other server must have had a remoteRetrieve issued to it by another FTPClient.
    
    参数:
    filename - The name to call the file that is to be stored.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - remoteStoreUnique
```
public boolean remoteStoreUnique(java.lang.String filename)
                          throws java.io.IOException
```
    Initiate a server to server file transfer. This method tells the server to which the client is connected to store a file on the other server using a unique filename based on the given filename. The other server must have had a remoteRetrieve issued to it by another FTPClient.
    
    参数:
    filename - The name on which to base the filename of the file that is to be stored.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - remoteStoreUnique
```
public boolean remoteStoreUnique()
                          throws java.io.IOException
```
    Initiate a server to server file transfer. This method tells the server to which the client is connected to store a file on the other server using a unique filename. The other server must have had a remoteRetrieve issued to it by another FTPClient. Many FTP servers require that a base filename be given from which the unique filename can be derived. For those servers use the other version of remoteStoreUnique
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - remoteAppend
```
public boolean remoteAppend(java.lang.String filename)
                     throws java.io.IOException
```
    Initiate a server to server file transfer. This method tells the server to which the client is connected to append to a given file on the other server. The other server must have had a remoteRetrieve issued to it by another FTPClient.
    
    参数:
    filename - The name of the file to be appended to, or if the file does not exist, the name to call the file being stored.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - completePendingCommand
```
public boolean completePendingCommand()
                               throws java.io.IOException
```
    There are a few FTPClient methods that do not complete the entire sequence of FTP commands to complete a transaction. These commands require some action by the programmer after the reception of a positive intermediate command. After the programmer's code completes its actions, it must call this method to receive the completion reply from the server and verify the success of the entire transaction.
    For example,
```
 InputStream input;
 OutputStream output;
 input  = new FileInputStream("foobaz.txt");
 output = ftp.storeFileStream("foobar.txt")
 if(!FTPReply.isPositiveIntermediate(ftp.getReplyCode())) {
     input.close();
     output.close();
     ftp.logout();
     ftp.disconnect();
     System.err.println("File transfer failed.");
     System.exit(1);
 }
 Util.copyStream(input, output);
 input.close();
 output.close();
 // Must call completePendingCommand() to finish command.
 if(!ftp.completePendingCommand()) {
     ftp.logout();
     ftp.disconnect();
     System.err.println("File transfer failed.");
     System.exit(1);
 }
 
```
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - retrieveFile
```
public boolean retrieveFile(java.lang.String remote,
                   java.io.OutputStream local)
                     throws java.io.IOException
```
    Retrieves a named file from the server and writes it to the given OutputStream. This method does NOT close the given OutputStream. If the current file type is ASCII, line separators in the file are converted to the local representation.
    Note: if you have used setRestartOffset(long), the file data will start from the selected offset.
    
    参数:
    remote - The name of the remote file.
    local - The local OutputStream to which to write the file.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    CopyStreamException - If an I/O error occurs while actually transferring the file. The CopyStreamException allows you to determine the number of bytes transferred and the IOException causing the error. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - _retrieveFile
```
protected boolean _retrieveFile(java.lang.String command,
                    java.lang.String remote,
                    java.io.OutputStream local)
                         throws java.io.IOException
```
    参数:
    command - the command to get
    remote - the remote file name
    local - the local file name
    
    返回:
    true if successful
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.1
  - retrieveFileStream
```
public java.io.InputStream retrieveFileStream(java.lang.String remote)
                                       throws java.io.IOException
```
    Returns an InputStream from which a named file from the server can be read. If the current file type is ASCII, the returned InputStream will convert line separators in the file to the local representation. You must close the InputStream when you finish reading from it. The InputStream itself will take care of closing the parent data connection socket upon being closed.
    To finalize the file transfer you must call completePendingCommand and check its return value to verify success. If this is not done, subsequent commands may behave unexpectedly.
    Note: if you have used setRestartOffset(long), the file data will start from the selected offset.
    
    参数:
    remote - The name of the remote file.
    
    返回:
    An InputStream from which the remote file can be read. If the data connection cannot be opened (e.g., the file does not exist), null is returned (in which case you may check the reply code to determine the exact reason for failure).
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - _retrieveFileStream
```
protected java.io.InputStream _retrieveFileStream(java.lang.String command,
                                      java.lang.String remote)
                                           throws java.io.IOException
```
    参数:
    command - the command to send
    remote - the remote file name
    
    返回:
    the stream from which to read the file
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.1
  - storeFile
```
public boolean storeFile(java.lang.String remote,
                java.io.InputStream local)
                  throws java.io.IOException
```
    Stores a file on the server using the given name and taking input from the given InputStream. This method does NOT close the given InputStream. If the current file type is ASCII, line separators in the file are transparently converted to the NETASCII format (i.e., you should not attempt to create a special InputStream to do this).
    
    参数:
    remote - The name to give the remote file.
    local - The local InputStream from which to read the file.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    CopyStreamException - If an I/O error occurs while actually transferring the file. The CopyStreamException allows you to determine the number of bytes transferred and the IOException causing the error. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - storeFileStream
```
public java.io.OutputStream storeFileStream(java.lang.String remote)
                                     throws java.io.IOException
```
    Returns an OutputStream through which data can be written to store a file on the server using the given name. If the current file type is ASCII, the returned OutputStream will convert line separators in the file to the NETASCII format (i.e., you should not attempt to create a special OutputStream to do this). You must close the OutputStream when you finish writing to it. The OutputStream itself will take care of closing the parent data connection socket upon being closed.
    To finalize the file transfer you must call completePendingCommand and check its return value to verify success. If this is not done, subsequent commands may behave unexpectedly.
    
    参数:
    remote - The name to give the remote file.
    
    返回:
    An OutputStream through which the remote file can be written. If the data connection cannot be opened (e.g., the file does not exist), null is returned (in which case you may check the reply code to determine the exact reason for failure).
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - appendFile
```
public boolean appendFile(java.lang.String remote,
                 java.io.InputStream local)
                   throws java.io.IOException
```
    Appends to a file on the server with the given name, taking input from the given InputStream. This method does NOT close the given InputStream. If the current file type is ASCII, line separators in the file are transparently converted to the NETASCII format (i.e., you should not attempt to create a special InputStream to do this).
    
    参数:
    remote - The name of the remote file.
    local - The local InputStream from which to read the data to be appended to the remote file.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    CopyStreamException - If an I/O error occurs while actually transferring the file. The CopyStreamException allows you to determine the number of bytes transferred and the IOException causing the error. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - appendFileStream
```
public java.io.OutputStream appendFileStream(java.lang.String remote)
                                      throws java.io.IOException
```
    Returns an OutputStream through which data can be written to append to a file on the server with the given name. If the current file type is ASCII, the returned OutputStream will convert line separators in the file to the NETASCII format (i.e., you should not attempt to create a special OutputStream to do this). You must close the OutputStream when you finish writing to it. The OutputStream itself will take care of closing the parent data connection socket upon being closed.
    To finalize the file transfer you must call completePendingCommand and check its return value to verify success. If this is not done, subsequent commands may behave unexpectedly.
    
    参数:
    remote - The name of the remote file.
    
    返回:
    An OutputStream through which the remote file can be appended. If the data connection cannot be opened (e.g., the file does not exist), null is returned (in which case you may check the reply code to determine the exact reason for failure).
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - storeUniqueFile
```
public boolean storeUniqueFile(java.lang.String remote,
                      java.io.InputStream local)
                        throws java.io.IOException
```
    Stores a file on the server using a unique name derived from the given name and taking input from the given InputStream. This method does NOT close the given InputStream. If the current file type is ASCII, line separators in the file are transparently converted to the NETASCII format (i.e., you should not attempt to create a special InputStream to do this).
    
    参数:
    remote - The name on which to base the unique name given to the remote file.
    local - The local InputStream from which to read the file.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    CopyStreamException - If an I/O error occurs while actually transferring the file. The CopyStreamException allows you to determine the number of bytes transferred and the IOException causing the error. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - storeUniqueFileStream
```
public java.io.OutputStream storeUniqueFileStream(java.lang.String remote)
                                           throws java.io.IOException
```
    Returns an OutputStream through which data can be written to store a file on the server using a unique name derived from the given name. If the current file type is ASCII, the returned OutputStream will convert line separators in the file to the NETASCII format (i.e., you should not attempt to create a special OutputStream to do this). You must close the OutputStream when you finish writing to it. The OutputStream itself will take care of closing the parent data connection socket upon being closed.
    To finalize the file transfer you must call completePendingCommand and check its return value to verify success. If this is not done, subsequent commands may behave unexpectedly.
    
    参数:
    remote - The name on which to base the unique name given to the remote file.
    
    返回:
    An OutputStream through which the remote file can be written. If the data connection cannot be opened (e.g., the file does not exist), null is returned (in which case you may check the reply code to determine the exact reason for failure).
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - storeUniqueFile
```
public boolean storeUniqueFile(java.io.InputStream local)
                        throws java.io.IOException
```
    Stores a file on the server using a unique name assigned by the server and taking input from the given InputStream. This method does NOT close the given InputStream. If the current file type is ASCII, line separators in the file are transparently converted to the NETASCII format (i.e., you should not attempt to create a special InputStream to do this).
    
    参数:
    local - The local InputStream from which to read the file.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    CopyStreamException - If an I/O error occurs while actually transferring the file. The CopyStreamException allows you to determine the number of bytes transferred and the IOException causing the error. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - storeUniqueFileStream
```
public java.io.OutputStream storeUniqueFileStream()
                                           throws java.io.IOException
```
    Returns an OutputStream through which data can be written to store a file on the server using a unique name assigned by the server. If the current file type is ASCII, the returned OutputStream will convert line separators in the file to the NETASCII format (i.e., you should not attempt to create a special OutputStream to do this). You must close the OutputStream when you finish writing to it. The OutputStream itself will take care of closing the parent data connection socket upon being closed.
    To finalize the file transfer you must call completePendingCommand and check its return value to verify success. If this is not done, subsequent commands may behave unexpectedly.
    
    返回:
    An OutputStream through which the remote file can be written. If the data connection cannot be opened (e.g., the file does not exist), null is returned (in which case you may check the reply code to determine the exact reason for failure).
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - allocate
```
public boolean allocate(int bytes)
                 throws java.io.IOException
```
    Reserve a number of bytes on the server for the next file transfer.
    
    参数:
    bytes - The number of bytes which the server should allocate.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - features
```
public boolean features()
                 throws java.io.IOException
```
    Query the server for supported features. The server may reply with a list of server-supported exensions. For example, a typical client-server interaction might be (from RFC 2389):
```
        C> feat
        S> 211-Extensions supported:
        S>  MLST size*;create;modify*;perm;media-type
        S>  SIZE
        S>  COMPRESSION
        S>  MDTM
        S> 211 END
 
```
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    2.2
    
    另请参阅:
    http://www.faqs.org/rfcs/rfc2389.html
  - featureValues
```
public java.lang.String[] featureValues(java.lang.String feature)
                                 throws java.io.IOException
```
    Query the server for a supported feature, and returns its values (if any). Caches the parsed response to avoid resending the command repeatedly.
    
    参数:
    feature - the feature to check
    
    返回:
    if the feature is present, returns the feature values (empty array if none) Returns null if the feature is not found or the command failed. Check FTP.getReplyCode() or FTP.getReplyString() if so.
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.0
  - featureValue
```
public java.lang.String featureValue(java.lang.String feature)
                              throws java.io.IOException
```
    Query the server for a supported feature, and returns the its value (if any). Caches the parsed response to avoid resending the command repeatedly.
    
    参数:
    feature - the feature to check
    
    返回:
    if the feature is present, returns the feature value or the empty string if the feature exists but has no value. Returns null if the feature is not found or the command failed. Check FTP.getReplyCode() or FTP.getReplyString() if so.
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.0
  - hasFeature
```
public boolean hasFeature(java.lang.String feature)
                   throws java.io.IOException
```
    Query the server for a supported feature. Caches the parsed response to avoid resending the command repeatedly.
    
    参数:
    feature - the name of the feature; it is converted to upper case.
    
    返回:
    true if the feature is present, false if the feature is not present or the FTP.feat() command failed. Check FTP.getReplyCode() or FTP.getReplyString() if it is necessary to distinguish these cases.
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.0
  - hasFeature
```
public boolean hasFeature(java.lang.String feature,
                 java.lang.String value)
                   throws java.io.IOException
```
    Query the server for a supported feature with particular value, for example "AUTH SSL" or "AUTH TLS". Caches the parsed response to avoid resending the command repeatedly.
    
    参数:
    feature - the name of the feature; it is converted to upper case.
    value - the value to find.
    
    返回:
    true if the feature is present, false if the feature is not present or the FTP.feat() command failed. Check FTP.getReplyCode() or FTP.getReplyString() if it is necessary to distinguish these cases.
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.0
  - allocate
```
public boolean allocate(int bytes,
               int recordSize)
                 throws java.io.IOException
```
    Reserve space on the server for the next file transfer.
    
    参数:
    bytes - The number of bytes which the server should allocate.
    recordSize - The size of a file record.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - doCommand
```
public boolean doCommand(java.lang.String command,
                java.lang.String params)
                  throws java.io.IOException
```
    Issue a command and wait for the reply.
    Should only be used with commands that return replies on the command channel - do not use for LIST, NLST, MLSD etc.
    
    参数:
    command - The command to invoke
    params - The parameters string, may be null
    
    返回:
    True if successfully completed, false if not, in which case call FTP.getReplyCode() or FTP.getReplyString() to get the reason.
    
    抛出:
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    从以下版本开始:
    
    3.0
  - doCommandAsStrings
```
public java.lang.String[] doCommandAsStrings(java.lang.String command,
                                    java.lang.String params)
                                      throws java.io.IOException
```
    Issue a command and wait for the reply, returning it as an array of strings.
    Should only be used with commands that return replies on the command channel - do not use for LIST, NLST, MLSD etc.
    
    参数:
    command - The command to invoke
    params - The parameters string, may be null
    
    返回:
    The array of replies, or null if the command failed, in which case call FTP.getReplyCode() or FTP.getReplyString() to get the reason.
    
    抛出:
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    从以下版本开始:
    
    3.0
  - mlistFile
```
public FTPFile mlistFile(java.lang.String pathname)
                  throws java.io.IOException
```
    Get file details using the MLST command
    
    参数:
    pathname - the file or directory to list, may be null
    
    返回:
    the file details, may be null
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.0
  - mlistDir
```
public FTPFile[] mlistDir()
                   throws java.io.IOException
```
    Generate a directory listing for the current directory using the MLSD command.
    
    返回:
    the array of file entries
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.0
  - mlistDir
```
public FTPFile[] mlistDir(java.lang.String pathname)
                   throws java.io.IOException
```
    Generate a directory listing using the MLSD command.
    
    参数:
    pathname - the directory name, may be null
    
    返回:
    the array of file entries
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.0
  - mlistDir
```
public FTPFile[] mlistDir(java.lang.String pathname,
                 FTPFileFilter filter)
                   throws java.io.IOException
```
    Generate a directory listing using the MLSD command.
    
    参数:
    pathname - the directory name, may be null
    filter - the filter to apply to the responses
    
    返回:
    the array of file entries
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    3.0
  - restart
```
protected boolean restart(long offset)
                   throws java.io.IOException
```
    Restart a STREAM_TRANSFER_MODE file transfer starting from the given offset. This will only work on FTP servers supporting the REST comand for the stream transfer mode. However, most FTP servers support this. Any subsequent file transfer will start reading or writing the remote file from the indicated offset.
    
    参数:
    offset - The offset into the remote file at which to start the next file transfer.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    从以下版本开始:
    
    3.1 (changed from private to protected)
  - setRestartOffset
```
public void setRestartOffset(long offset)
```
    Sets the restart offset for file transfers.
    The restart command is not sent to the server immediately. It is sent when a data connection is created as part of a subsequent command. The restart marker is reset to zero after use.
    
    Note: This method should only be invoked immediately prior to the transfer to which it applies.
    
    参数:
    offset - The offset into the remote file at which to start the next file transfer. This must be a value greater than or equal to zero.
  - getRestartOffset
```
public long getRestartOffset()
```
    Fetches the restart offset.
    
    返回:
    offset The offset into the remote file at which to start the next file transfer.
  - rename
```
public boolean rename(java.lang.String from,
             java.lang.String to)
               throws java.io.IOException
```
    Renames a remote file.
    
    参数:
    from - The name of the remote file to rename.
    to - The new name of the remote file.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - abort
```
public boolean abort()
              throws java.io.IOException
```
    Abort a transfer in progress.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - deleteFile
```
public boolean deleteFile(java.lang.String pathname)
                   throws java.io.IOException
```
    Deletes a file on the FTP server.
    
    参数:
    pathname - The pathname of the file to be deleted.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - removeDirectory
```
public boolean removeDirectory(java.lang.String pathname)
                        throws java.io.IOException
```
    Removes a directory on the FTP server (if empty).
    
    参数:
    pathname - The pathname of the directory to remove.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - makeDirectory
```
public boolean makeDirectory(java.lang.String pathname)
                      throws java.io.IOException
```
    Creates a new subdirectory on the FTP server in the current directory (if a relative pathname is given) or where specified (if an absolute pathname is given).
    
    参数:
    pathname - The pathname of the directory to create.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - printWorkingDirectory
```
public java.lang.String printWorkingDirectory()
                                       throws java.io.IOException
```
    Returns the pathname of the current working directory.
    
    返回:
    The pathname of the current working directory. If it cannot be obtained, returns null.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - sendSiteCommand
```
public boolean sendSiteCommand(java.lang.String arguments)
                        throws java.io.IOException
```
    Send a site specific command.
    
    参数:
    arguments - The site specific command and arguments.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - getSystemType
```
public java.lang.String getSystemType()
                               throws java.io.IOException
```
    Fetches the system type from the server and returns the string. This value is cached for the duration of the connection after the first call to this method. In other words, only the first time that you invoke this method will it issue a SYST command to the FTP server. FTPClient will remember the value and return the cached value until a call to disconnect.
    If the SYST command fails, and the system property FTP_SYSTEM_TYPE_DEFAULT is defined, then this is used instead.
    
    返回:
    The system type obtained from the server. Never null.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server (and the default system type property is not defined)
    从以下版本开始:
    
    2.2
  - listHelp
```
public java.lang.String listHelp()
                          throws java.io.IOException
```
    Fetches the system help information from the server and returns the full string.
    
    返回:
    The system help string obtained from the server. null if the information could not be obtained.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - listHelp
```
public java.lang.String listHelp(java.lang.String command)
                          throws java.io.IOException
```
    Fetches the help information for a given command from the server and returns the full string.
    
    参数:
    command - The command on which to ask for help.
    
    返回:
    The command help string obtained from the server. null if the information could not be obtained.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - sendNoOp
```
public boolean sendNoOp()
                 throws java.io.IOException
```
    Sends a NOOP command to the FTP server. This is useful for preventing server timeouts.
    
    返回:
    True if successfully completed, false if not.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - listNames
```
public java.lang.String[] listNames(java.lang.String pathname)
                             throws java.io.IOException
```
    Obtain a list of filenames in a directory (or just the name of a given file, which is not particularly useful). This information is obtained through the NLST command. If the given pathname is a directory and contains no files, a zero length array is returned only if the FTP server returned a positive completion code, otherwise null is returned (the FTP server returned a 550 error No files found.). If the directory is not empty, an array of filenames in the directory is returned. If the pathname corresponds to a file, only that file will be listed. The server may or may not expand glob expressions.
    
    参数:
    pathname - The file or directory to list. Warning: the server may treat a leading '-' as an option introducer. If so, try using an absolute path, or prefix the path with ./ (unix style servers). Some servers may support "--" as meaning end of options, in which case "-- -xyz" should work.
    
    返回:
    The list of filenames contained in the given path. null if the list could not be obtained. If there are no filenames in the directory, a zero-length array is returned.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - listNames
```
public java.lang.String[] listNames()
                             throws java.io.IOException
```
    Obtain a list of filenames in the current working directory This information is obtained through the NLST command. If the current directory contains no files, a zero length array is returned only if the FTP server returned a positive completion code, otherwise, null is returned (the FTP server returned a 550 error No files found.). If the directory is not empty, an array of filenames in the directory is returned.
    
    返回:
    The list of filenames contained in the current working directory. null if the list could not be obtained. If there are no filenames in the directory, a zero-length array is returned.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - listFiles
```
public FTPFile[] listFiles(java.lang.String pathname)
                    throws java.io.IOException
```
    Using the default system autodetect mechanism, obtain a list of file information for the current working directory or for just a single file.
    This information is obtained through the LIST command. The contents of the returned array is determined by the FTPFileEntryParser used.
    N.B. the LIST command does not generally return very precise timestamps. For recent files, the response usually contains hours and minutes (not seconds). For older files, the output may only contain a date. If the server supports it, the MLSD command returns timestamps with a precision of seconds, and may include milliseconds. See mlistDir()
    
    参数:
    pathname - The file or directory to list. Since the server may or may not expand glob expressions, using them here is not recommended and may well cause this method to fail. Also, some servers treat a leading '-' as being an option. To avoid this interpretation, use an absolute pathname or prefix the pathname with ./ (unix style servers). Some servers may support "--" as meaning end of options, in which case "-- -xyz" should work.
    
    返回:
    The list of file information contained in the given path in the format determined by the autodetection mechanism
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    
    ParserInitializationException - Thrown if the parserKey parameter cannot be resolved by the selected parser factory. In the DefaultFTPEntryParserFactory, this will happen when parserKey is neither the fully qualified class name of a class implementing the interface com.fr.ftp.ftp.FTPFileEntryParser nor a string containing one of the recognized keys mapping to such a parser or if class loader security issues prevent its being loaded.
    另请参阅:
    DefaultFTPFileEntryParserFactory, FTPFileEntryParserFactory, FTPFileEntryParser
  - listFiles
```
public FTPFile[] listFiles()
                    throws java.io.IOException
```
    Using the default system autodetect mechanism, obtain a list of file information for the current working directory.
    This information is obtained through the LIST command. The contents of the returned array is determined by the FTPFileEntryParser used.
    N.B. the LIST command does not generally return very precise timestamps. For recent files, the response usually contains hours and minutes (not seconds). For older files, the output may only contain a date. If the server supports it, the MLSD command returns timestamps with a precision of seconds, and may include milliseconds. See mlistDir()
    
    返回:
    The list of file information contained in the current directory in the format determined by the autodetection mechanism.
    NOTE: This array may contain null members if any of the individual file listings failed to parse. The caller should check each entry for null before referencing it.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    
    ParserInitializationException - Thrown if the parserKey parameter cannot be resolved by the selected parser factory. In the DefaultFTPEntryParserFactory, this will happen when parserKey is neither the fully qualified class name of a class implementing the interface com.fr.ftp.ftp.FTPFileEntryParser nor a string containing one of the recognized keys mapping to such a parser or if class loader security issues prevent its being loaded.
    另请参阅:
    DefaultFTPFileEntryParserFactory, FTPFileEntryParserFactory, FTPFileEntryParser
  - listFiles
```
public FTPFile[] listFiles(java.lang.String pathname,
                  FTPFileFilter filter)
                    throws java.io.IOException
```
    Version of listFiles(String) which allows a filter to be provided. For example: listFiles("site", FTPFileFilters.DIRECTORY);
    
    参数:
    pathname - the initial path, may be null
    filter - the filter, non-null
    
    返回:
    the list of FTPFile entries.
    
    抛出:
    
    java.io.IOException - on error
    从以下版本开始:
    
    2.2
  - listDirectories
```
public FTPFile[] listDirectories()
                          throws java.io.IOException
```
    Using the default system autodetect mechanism, obtain a list of directories contained in the current working directory.
    This information is obtained through the LIST command. The contents of the returned array is determined by the FTPFileEntryParser used.
    N.B. the LIST command does not generally return very precise timestamps. For recent files, the response usually contains hours and minutes (not seconds). For older files, the output may only contain a date. If the server supports it, the MLSD command returns timestamps with a precision of seconds, and may include milliseconds. See mlistDir()
    
    返回:
    The list of directories contained in the current directory in the format determined by the autodetection mechanism.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    
    ParserInitializationException - Thrown if the parserKey parameter cannot be resolved by the selected parser factory. In the DefaultFTPEntryParserFactory, this will happen when parserKey is neither the fully qualified class name of a class implementing the interface com.fr.ftp.ftp.FTPFileEntryParser nor a string containing one of the recognized keys mapping to such a parser or if class loader security issues prevent its being loaded.
    从以下版本开始:
    
    3.0
    
    另请参阅:
    DefaultFTPFileEntryParserFactory, FTPFileEntryParserFactory, FTPFileEntryParser
  - listDirectories
```
public FTPFile[] listDirectories(java.lang.String parent)
                          throws java.io.IOException
```
    Using the default system autodetect mechanism, obtain a list of directories contained in the specified directory.
    This information is obtained through the LIST command. The contents of the returned array is determined by the FTPFileEntryParser used.
    N.B. the LIST command does not generally return very precise timestamps. For recent files, the response usually contains hours and minutes (not seconds). For older files, the output may only contain a date. If the server supports it, the MLSD command returns timestamps with a precision of seconds, and may include milliseconds. See mlistDir()
    
    参数:
    parent - the starting directory
    
    返回:
    The list of directories contained in the specified directory in the format determined by the autodetection mechanism.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    
    ParserInitializationException - Thrown if the parserKey parameter cannot be resolved by the selected parser factory. In the DefaultFTPEntryParserFactory, this will happen when parserKey is neither the fully qualified class name of a class implementing the interface com.fr.ftp.ftp.FTPFileEntryParser nor a string containing one of the recognized keys mapping to such a parser or if class loader security issues prevent its being loaded.
    从以下版本开始:
    
    3.0
    
    另请参阅:
    DefaultFTPFileEntryParserFactory, FTPFileEntryParserFactory, FTPFileEntryParser
  - initiateListParsing
```
public FTPListParseEngine initiateListParsing()
                                       throws java.io.IOException
```
    Using the default autodetect mechanism, initialize an FTPListParseEngine object containing a raw file information for the current working directory on the server This information is obtained through the LIST command. This object is then capable of being iterated to return a sequence of FTPFile objects with information filled in by the FTPFileEntryParser used.
    This method differs from using the listFiles() methods in that expensive FTPFile objects are not created until needed which may be an advantage on large lists.
    
    返回:
    A FTPListParseEngine object that holds the raw information and is capable of providing parsed FTPFile objects, one for each file containing information contained in the given path in the format determined by the parser parameter. Null will be returned if a data connection cannot be opened. If the current working directory contains no files, an empty array will be the return.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    
    ParserInitializationException - Thrown if the autodetect mechanism cannot resolve the type of system we are connected with.
    另请参阅:
    FTPListParseEngine
  - initiateListParsing
```
public FTPListParseEngine initiateListParsing(java.lang.String pathname)
                                       throws java.io.IOException
```
    Using the default autodetect mechanism, initialize an FTPListParseEngine object containing a raw file information for the supplied directory. This information is obtained through the LIST command. This object is then capable of being iterated to return a sequence of FTPFile objects with information filled in by the FTPFileEntryParser used.
    The server may or may not expand glob expressions. You should avoid using glob expressions because the return format for glob listings differs from server to server and will likely cause this method to fail.
    This method differs from using the listFiles() methods in that expensive FTPFile objects are not created until needed which may be an advantage on large lists.
```
    FTPClient f=FTPClient();
    f.connect(server);
    f.login(username, password);
    FTPListParseEngine engine = f.initiateListParsing(directory);

    while (engine.hasNext()) {
       FTPFile[] files = engine.getNext(25);  // "page size" you want
       //do whatever you want with these files, display them, etc.
       //expensive FTPFile objects not created until needed.
    }
 
```
    参数:
    pathname - the starting directory
    
    返回:
    A FTPListParseEngine object that holds the raw information and is capable of providing parsed FTPFile objects, one for each file containing information contained in the given path in the format determined by the parser parameter. Null will be returned if a data connection cannot be opened. If the current working directory contains no files, an empty array will be the return.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    
    ParserInitializationException - Thrown if the autodetect mechanism cannot resolve the type of system we are connected with.
    另请参阅:
    FTPListParseEngine
  - initiateListParsing
```
public FTPListParseEngine initiateListParsing(java.lang.String parserKey,
                                     java.lang.String pathname)
                                       throws java.io.IOException
```
    Using the supplied parser key, initialize an FTPListParseEngine object containing a raw file information for the supplied directory. This information is obtained through the LIST command. This object is then capable of being iterated to return a sequence of FTPFile objects with information filled in by the FTPFileEntryParser used.
    The server may or may not expand glob expressions. You should avoid using glob expressions because the return format for glob listings differs from server to server and will likely cause this method to fail.
    This method differs from using the listFiles() methods in that expensive FTPFile objects are not created until needed which may be an advantage on large lists.
    
    参数:
    parserKey - A string representing a designated code or fully-qualified class name of an FTPFileEntryParser that should be used to parse each server file listing. May be null, in which case the code checks first the system property FTP_SYSTEM_TYPE, and if that is not defined the SYST command is used to provide the value. To allow for arbitrary system types, the return from the SYST command is used to look up an alias for the type in the SYSTEM_TYPE_PROPERTIES properties file if it is available.
    pathname - the starting directory
    
    返回:
    A FTPListParseEngine object that holds the raw information and is capable of providing parsed FTPFile objects, one for each file containing information contained in the given path in the format determined by the parser parameter. Null will be returned if a data connection cannot be opened. If the current working directory contains no files, an empty array will be the return.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
    
    ParserInitializationException - Thrown if the parserKey parameter cannot be resolved by the selected parser factory. In the DefaultFTPEntryParserFactory, this will happen when parserKey is neither the fully qualified class name of a class implementing the interface com.fr.ftp.ftp.FTPFileEntryParser nor a string containing one of the recognized keys mapping to such a parser or if class loader security issues prevent its being loaded.
    另请参阅:
    FTPListParseEngine
  - getListArguments
```
protected java.lang.String getListArguments(java.lang.String pathname)
```
    参数:
    pathname - the initial pathname
    
    返回:
    the adjusted string with "-a" added if necessary
    从以下版本开始:
    
    2.0
  - getStatus
```
public java.lang.String getStatus()
                           throws java.io.IOException
```
    Issue the FTP STAT command to the server.
    
    返回:
    The status information returned by the server.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - getStatus
```
public java.lang.String getStatus(java.lang.String pathname)
                           throws java.io.IOException
```
    Issue the FTP STAT command to the server for a given pathname. This should produce a listing of the file or directory.
    
    参数:
    pathname - the filename
    
    返回:
    The status information returned by the server.
    
    抛出:
    
    FTPConnectionClosedException - If the FTP server prematurely closes the connection as a result of the client being idle or some other reason causing the server to send FTP reply code 421. This exception may be caught either as an IOException or independently as itself.
    
    java.io.IOException - If an I/O error occurs while either sending a command to the server or receiving a reply from the server.
  - getModificationTime
```
public java.lang.String getModificationTime(java.lang.String pathname)
                                     throws java.io.IOException
```
    Issue the FTP MDTM command (not supported by all servers) to retrieve the last modification time of a file. The modification string should be in the ISO 3077 form "YYYYMMDDhhmmss(.xxx)?". The timestamp represented should also be in GMT, but not all FTP servers honour this.
    
    参数:
    pathname - The file path to query.
    
    返回:
    A string representing the last file modification time in YYYYMMDDhhmmss format.
    
    抛出:
    
    java.io.IOException - if an I/O error occurs.
    从以下版本开始:
    
    2.0
  - mdtmFile
```
public FTPFile mdtmFile(java.lang.String pathname)
                 throws java.io.IOException
```
    Issue the FTP MDTM command (not supported by all servers) to retrieve the last modification time of a file. The modification string should be in the ISO 3077 form "YYYYMMDDhhmmss(.xxx)?". The timestamp represented should also be in GMT, but not all FTP servers honour this.
    
    参数:
    pathname - The file path to query.
    
    返回:
    A FTPFile representing the last file modification time, may be null. The FTPFile timestamp will be null if a parse error occurs.
    
    抛出:
    
    java.io.IOException - if an I/O error occurs.
    从以下版本开始:
    
    3.4
  - setModificationTime
```
public boolean setModificationTime(java.lang.String pathname,
                          java.lang.String timeval)
                            throws java.io.IOException
```
    Issue the FTP MFMT command (not supported by all servers) which sets the last modified time of a file. The timestamp should be in the form YYYYMMDDhhmmss. It should also be in GMT, but not all servers honour this. An FTP server would indicate its support of this feature by including "MFMT" in its response to the FEAT command, which may be retrieved by FTPClient.features()
    
    参数:
    pathname - The file path for which last modified time is to be changed.
    timeval - The timestamp to set to, in YYYYMMDDhhmmss format.
    
    返回:
    true if successfully set, false if not
    
    抛出:
    
    java.io.IOException - if an I/O error occurs.
    从以下版本开始:
    
    2.2
    
    另请参阅:
    http://tools.ietf.org/html/draft-somers-ftp-mfxx-04
  - setBufferSize
```
public void setBufferSize(int bufSize)
```
    Set the internal buffer size for buffered data streams.
    
    参数:
    bufSize - The size of the buffer. Use a non-positive value to use the default.
  - getBufferSize
```
public int getBufferSize()
```
    Retrieve the current internal buffer size for buffered data streams.
    
    返回:
    The current buffer size.
  - setSendDataSocketBufferSize
```
public void setSendDataSocketBufferSize(int bufSize)
```
    Sets the value to be used for the data socket SO_SNDBUF option. If the value is positive, the option will be set when the data socket has been created.
    
    参数:
    bufSize - The size of the buffer, zero or negative means the value is ignored.
    从以下版本开始:
    
    3.3
  - getSendDataSocketBufferSize
```
public int getSendDataSocketBufferSize()
```
    Retrieve the value to be used for the data socket SO_SNDBUF option.
    
    返回:
    The current buffer size.
    从以下版本开始:
    
    3.3
  - setReceieveDataSocketBufferSize
```
public void setReceieveDataSocketBufferSize(int bufSize)
```
    Sets the value to be used for the data socket SO_RCVBUF option. If the value is positive, the option will be set when the data socket has been created.
    
    参数:
    bufSize - The size of the buffer, zero or negative means the value is ignored.
    从以下版本开始:
    
    3.3
  - getReceiveDataSocketBufferSize
```
public int getReceiveDataSocketBufferSize()
```
    Retrieve the value to be used for the data socket SO_RCVBUF option.
    
    返回:
    The current buffer size.
    从以下版本开始:
    
    3.3
  - configure
```
public void configure(FTPClientConfig config)
```
    Implementation of the Configurable interface. In the case of this class, configuring merely makes the config object available for the factory methods that construct parsers.
    
    指定者:
    
    configure 在接口中 Configurable
    
    参数:
    config - FTPClientConfig object used to provide non-standard configurations to the parser.
    从以下版本开始:
    
    1.4
  - setListHiddenFiles
```
public void setListHiddenFiles(boolean listHiddenFiles)
```
    You can set this to true if you would like to get hidden files when listFiles(java.lang.String) too. A LIST -a will be issued to the ftp server. It depends on your ftp server if you need to call this method, also dont expect to get rid of hidden files if you call this method with "false".
    
    参数:
    listHiddenFiles - true if hidden files should be listed
    从以下版本开始:
    
    2.0
  - getListHiddenFiles
```
public boolean getListHiddenFiles()
```
    返回:
    the current state
    从以下版本开始:
    
    2.0
    
    另请参阅:
    setListHiddenFiles(boolean)
  - isUseEPSVwithIPv4
```
public boolean isUseEPSVwithIPv4()
```
    Whether should attempt to use EPSV with IPv4. Default (if not set) is false
    
    返回:
    true if should attempt EPSV
    从以下版本开始:
    
    2.2
  - setUseEPSVwithIPv4
```
public void setUseEPSVwithIPv4(boolean selected)
```
    Set whether to use EPSV with IPv4. Might be worth enabling in some circumstances. For example, when using IPv4 with NAT it may work with some rare configurations. E.g. if FTP server has a static PASV address (external network) and the client is coming from another internal network. In that case the data connection after PASV command would fail, while EPSV would make the client succeed by taking just the port.
    
    参数:
    selected - value to set.
    从以下版本开始:
    
    2.2
  - setCopyStreamListener
```
public void setCopyStreamListener(CopyStreamListener listener)
```
    Set the listener to be used when performing store/retrieve operations. The default value (if not set) is null.
    
    参数:
    listener - to be used, may be null to disable
    从以下版本开始:
    
    3.0
  - getCopyStreamListener
```
public CopyStreamListener getCopyStreamListener()
```
    Obtain the currently active listener.
    
    返回:
    the listener, may be null
    从以下版本开始:
    
    3.0
  - setControlKeepAliveTimeout
```
public void setControlKeepAliveTimeout(long controlIdle)
```
    Set the time to wait between sending control connection keepalive messages when processing file upload or download.
    
    参数:
    controlIdle - the wait (in secs) between keepalive messages. Zero (or less) disables.
    从以下版本开始:
    
    3.0
    
    另请参阅:
    setControlKeepAliveReplyTimeout(int)
  - getControlKeepAliveTimeout
```
public long getControlKeepAliveTimeout()
```
    Get the time to wait between sending control connection keepalive messages.
    
    返回:
    the number of seconds between keepalive messages.
    从以下版本开始:
    
    3.0
  - setControlKeepAliveReplyTimeout
```
public void setControlKeepAliveReplyTimeout(int timeout)
```
    Set how long to wait for control keep-alive message replies.
    
    参数:
    timeout - number of milliseconds to wait (defaults to 1000)
    从以下版本开始:
    
    3.0
    
    另请参阅:
    setControlKeepAliveTimeout(long)
  - getControlKeepAliveReplyTimeout
```
public int getControlKeepAliveReplyTimeout()
```
    Get how long to wait for control keep-alive message replies.
    
    返回:
    wait time in msec
    从以下版本开始:
    
    3.0
  - setPassiveNatWorkaroundStrategy
```
public void setPassiveNatWorkaroundStrategy(FTPClient.HostnameResolver resolver)
```
    Set the workaround strategy to replace the PASV mode reply addresses. This gets around the problem that some NAT boxes may change the reply. The default implementation is NatServerResolverImpl, i.e. site-local replies are replaced.
    
    参数:
    resolver - strategy to replace internal IP's in passive mode or null to disable the workaround (i.e. use PASV mode reply address.)
    从以下版本开始:
    
    3.6
  - setAutodetectUTF8
```
public void setAutodetectUTF8(boolean autodetect)
```
    Enables or disables automatic server encoding detection (only UTF-8 supported).
    Does not affect existing connections; must be invoked before a connection is established.
    
    参数:
    autodetect - If true, automatic server encoding detection will be enabled.
  - getAutodetectUTF8
```
public boolean getAutodetectUTF8()
```
    Tells if automatic server encoding detection is enabled or disabled.
    
    返回:
    true, if automatic server encoding detection is enabled.

类 FTPClient

嵌套类概要

字段概要

从类继承的字段 com.fr.ftp.client.FTP

从类继承的字段 com.fr.ftp.SocketClient

构造器概要

方法概要

从类继承的方法 com.fr.ftp.client.FTP

从类继承的方法 com.fr.ftp.SocketClient

从类继承的方法 java.lang.Object

字段详细资料

FTP_SYSTEM_TYPE

FTP_SYSTEM_TYPE_DEFAULT

SYSTEM_TYPE_PROPERTIES

ACTIVE_LOCAL_DATA_CONNECTION_MODE

ACTIVE_REMOTE_DATA_CONNECTION_MODE

PASSIVE_LOCAL_DATA_CONNECTION_MODE

PASSIVE_REMOTE_DATA_CONNECTION_MODE

构造器详细资料

FTPClient

方法详细资料

_parsePassiveModeReply

_parseExtendedPassiveModeReply

_storeFile

_storeFileStream

_openDataConnection_

_openDataConnection_

_connectAction_

_connectAction_

setDataTimeout

setParserFactory

disconnect

setRemoteVerificationEnabled

isRemoteVerificationEnabled

login

login

logout

changeWorkingDirectory

changeToParentDirectory

structureMount

reinitialize

enterLocalActiveMode

enterLocalPassiveMode

enterRemoteActiveMode

enterRemotePassiveMode

getPassiveHost

getPassivePort

getDataConnectionMode

setActivePortRange

setActiveExternalIPAddress

setPassiveLocalIPAddress

setPassiveLocalIPAddress

getPassiveLocalIPAddress

setReportActiveExternalIPAddress

setFileType

setFileType

setFileStructure

setFileTransferMode

remoteRetrieve

remoteStore

remoteStoreUnique

remoteStoreUnique

remoteAppend

completePendingCommand

retrieveFile

_retrieveFile

retrieveFileStream

_retrieveFileStream

storeFile

storeFileStream

appendFile

appendFileStream

storeUniqueFile

storeUniqueFileStream

storeUniqueFile

storeUniqueFileStream

allocate

features

featureValues

featureValue