org.apache.commons.net.ftp

Class FTP


public class FTP
extends SocketClient

FTP provides the basic the functionality necessary to implement your own FTP client. It extends org.apache.commons.net.SocketClient since extending TelnetClient was causing unwanted behavior (like connections that did not time out properly).

To derive the full benefits of the FTP class requires some knowledge of the FTP protocol defined in RFC 959. However, there is no reason why you should have to use the FTP class. The FTPClient class, derived from FTP, implements all the functionality required of an FTP client. The FTP class is made public to provide access to various FTP constants and to make it easier for adventurous programmers (or those with special needs) to interact with the FTP protocol and implement their own clients. A set of methods with names corresponding to the FTP command names are provided to facilitate this interaction.

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 FTP 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 . FTPConectionClosedException 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 FTP. 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 periodicaly 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 org.apache.commons.net.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.

See Also:
FTPClient, FTPConnectionClosedException, org.apache.commons.net.MalformedServerReplyException

Field Summary

static int
ASCII_FILE_TYPE
A constant used to indicate the file(s) being transfered should be treated as ASCII.
static int
BINARY_FILE_TYPE
A constant used to indicate the file(s) being transfered should be treated as a binary image, i.e., no translations should be performed.
static int
BLOCK_TRANSFER_MODE
A constant used to indicate a file is to be transfered as a series of blocks.
static int
CARRIAGE_CONTROL_TEXT_FORMAT
A constant used to indicate a text file contains ASA vertical format control characters.
static int
COMPRESSED_TRANSFER_MODE
A constant used to indicate a file is to be transfered as FTP compressed data.
static String
DEFAULT_CONTROL_ENCODING
The default character encoding used for communicating over an FTP control connection.
static int
DEFAULT_DATA_PORT
The default FTP data port (20).
static int
DEFAULT_PORT
The default FTP control port (21).
static int
EBCDIC_FILE_TYPE
A constant used to indicate the file(s) being transfered should be treated as EBCDIC.
static int
FILE_STRUCTURE
A constant used to indicate a file is to be treated as a continuous sequence of bytes.
static int
LOCAL_FILE_TYPE
A constant used to indicate the file(s) being transfered should be treated as a local type.
static int
NON_PRINT_TEXT_FORMAT
A constant used for text files to indicate a non-print text format.
static int
PAGE_STRUCTURE
A constant used to indicate a file is to be treated as a set of independent indexed pages.
static int
RECORD_STRUCTURE
A constant used to indicate a file is to be treated as a sequence of records.
static int
STREAM_TRANSFER_MODE
A constant used to indicate a file is to be transfered as a stream of bytes.
static int
TELNET_TEXT_FORMAT
A constant used to indicate a text file contains format vertical format control characters.
protected ProtocolCommandSupport
_commandSupport_
A ProtocolCommandSupport object used to manage the registering of ProtocolCommandListeners and te firing of ProtocolCommandEvents.
protected String
_controlEncoding
protected BufferedReader
_controlInput_
Wraps SocketClient._input_ to facilitate the writing of text to the FTP control connection.
protected BufferedWriter
_controlOutput_
Wraps SocketClient._output_ to facilitate the reading of text from the FTP control connection.
protected boolean
_newReplyString
protected int
_replyCode
protected ArrayList
_replyLines
protected String
_replyString
protected boolean
strictMultilineParsing
This is used to signal whether a block of multiline responses beginning with xxx must be terminated by the same numeric code xxx See section 4.2 of RFX 959 for details.

Constructor Summary

FTP()
The default FTP constructor.

Method Summary

int
abor()
A convenience method to send the FTP ABOR command to the server, receive the reply, and return the reply code.
int
acct(String account)
A convenience method to send the FTP ACCT command to the server, receive the reply, and return the reply code.
void
addProtocolCommandListener(ProtocolCommandListener listener)
Adds a ProtocolCommandListener.
int
allo(int bytes)
A convenience method to send the FTP ALLO command to the server, receive the reply, and return the reply code.
int
allo(int bytes, int recordSize)
A convenience method to send the FTP ALLO command to the server, receive the reply, and return the reply code.
int
appe(String pathname)
A convenience method to send the FTP APPE command to the server, receive the reply, and return the reply code.
int
cdup()
A convenience method to send the FTP CDUP command to the server, receive the reply, and return the reply code.
int
cwd(String directory)
A convenience method to send the FTP CWD command to the server, receive the reply, and return the reply code.
int
dele(String pathname)
A convenience method to send the FTP DELE command to the server, receive the reply, and return the reply code.
String
getControlEncoding()
int
getReply()
Fetches a reply from the FTP server and returns the integer reply code.
int
getReplyCode()
Returns the integer value of the reply code of the last FTP reply.
String
getReplyString()
Returns the entire text of the last FTP server response exactly as it was received, including all end of line markers in NETASCII format.
String[]
getReplyStrings()
Returns the lines of text from the last FTP server response as an array of strings, one entry per line.
int
help()
A convenience method to send the FTP HELP command to the server, receive the reply, and return the reply code.
int
help(String command)
A convenience method to send the FTP HELP command to the server, receive the reply, and return the reply code.
boolean
isStrictMultilineParsing()
Return whether strict multiline parsing is enabled, as per RFX 959, section 4.2.
int
list()
A convenience method to send the FTP LIST command to the server, receive the reply, and return the reply code.
int
list(String pathname)
A convenience method to send the FTP LIST command to the server, receive the reply, and return the reply code.
int
mdtm(String file)
int
mkd(String pathname)
A convenience method to send the FTP MKD command to the server, receive the reply, and return the reply code.
int
mode(int mode)
A convenience method to send the FTP MODE command to the server, receive the reply, and return the reply code.
int
nlst()
A convenience method to send the FTP NLST command to the server, receive the reply, and return the reply code.
int
nlst(String pathname)
A convenience method to send the FTP NLST command to the server, receive the reply, and return the reply code.
int
noop()
A convenience method to send the FTP NOOP command to the server, receive the reply, and return the reply code.
int
pass(String password)
A convenience method to send the FTP PASS command to the server, receive the reply, and return the reply code.
int
pasv()
A convenience method to send the FTP PASV command to the server, receive the reply, and return the reply code.
int
port(InetAddress host, int port)
A convenience method to send the FTP PORT command to the server, receive the reply, and return the reply code.
int
pwd()
A convenience method to send the FTP PWD command to the server, receive the reply, and return the reply code.
int
quit()
A convenience method to send the FTP QUIT command to the server, receive the reply, and return the reply code.
int
rein()
A convenience method to send the FTP REIN command to the server, receive the reply, and return the reply code.
void
removeProtocolCommandListener(ProtocolCommandListener listener)
Removes a ProtocolCommandListener.
int
rest(String marker)
A convenience method to send the FTP REST command to the server, receive the reply, and return the reply code.
int
retr(String pathname)
A convenience method to send the FTP RETR command to the server, receive the reply, and return the reply code.
int
rmd(String pathname)
A convenience method to send the FTP RMD command to the server, receive the reply, and return the reply code.
int
rnfr(String pathname)
A convenience method to send the FTP RNFR command to the server, receive the reply, and return the reply code.
int
rnto(String pathname)
A convenience method to send the FTP RNTO command to the server, receive the reply, and return the reply code.
int
sendCommand(String command)
Sends an FTP command with no arguments to the server, waits for a reply and returns the numerical response code.
int
sendCommand(String command, String args)
Sends an FTP command to the server, waits for a reply and returns the numerical response code.
int
sendCommand(int command)
Sends an FTP command with no arguments to the server, waits for a reply and returns the numerical response code.
int
sendCommand(int command, String args)
Sends an FTP command to the server, waits for a reply and returns the numerical response code.
void
setControlEncoding(String encoding)
Sets the character encoding used by the FTP control connection.
void
setStrictMultilineParsing(boolean strictMultilineParsing)
Set strict multiline parsing.
int
site(String parameters)
A convenience method to send the FTP SITE command to the server, receive the reply, and return the reply code.
int
smnt(String dir)
A convenience method to send the FTP SMNT command to the server, receive the reply, and return the reply code.
int
stat()
A convenience method to send the FTP STAT command to the server, receive the reply, and return the reply code.
int
stat(String pathname)
A convenience method to send the FTP STAT command to the server, receive the reply, and return the reply code.
int
stor(String pathname)
A convenience method to send the FTP STOR command to the server, receive the reply, and return the reply code.
int
stou()
A convenience method to send the FTP STOU command to the server, receive the reply, and return the reply code.
int
stou(String pathname)
A convenience method to send the FTP STOU command to the server, receive the reply, and return the reply code.
int
stru(int structure)
A convenience method to send the FTP STRU command to the server, receive the reply, and return the reply code.
int
syst()
A convenience method to send the FTP SYST command to the server, receive the reply, and return the reply code.
int
type(int fileType)
A convenience method to send the FTP TYPE command to the server, receive the reply, and return the reply code.
int
type(int fileType, int formatOrByteSize)
A convenience method to send the FTP TYPE command for text files to the server, receive the reply, and return the reply code.
int
user(String username)
A convenience method to send the FTP USER command to the server, receive the reply, and return the reply code.
protected @Override
void _connectAction_()
Initiates control connections and gets initial reply.
@Override
void disconnect()
Closes the control connection to the FTP server and sets to null some internal data so that the memory may be reclaimed by the garbage collector.

Field Details

ASCII_FILE_TYPE

public static final int ASCII_FILE_TYPE
A constant used to indicate the file(s) being transfered should be treated as ASCII. This is the default file type. All constants ending in FILE_TYPE are used to indicate file types.
Field Value:
0

BINARY_FILE_TYPE

public static final int BINARY_FILE_TYPE
A constant used to indicate the file(s) being transfered should be treated as a binary image, i.e., no translations should be performed. All constants ending in FILE_TYPE are used to indicate file types.
Field Value:
2

BLOCK_TRANSFER_MODE

public static final int BLOCK_TRANSFER_MODE
A constant used to indicate a file is to be transfered as a series of blocks. All constants ending in TRANSFER_MODE are used to indicate file transfer modes.
Field Value:
11

CARRIAGE_CONTROL_TEXT_FORMAT

public static final int CARRIAGE_CONTROL_TEXT_FORMAT
A constant used to indicate a text file contains ASA vertical format control characters. All constants ending in TEXT_FORMAT are used to indicate text formatting for text transfers (both ASCII and EBCDIC).
Field Value:
6

COMPRESSED_TRANSFER_MODE

public static final int COMPRESSED_TRANSFER_MODE
A constant used to indicate a file is to be transfered as FTP compressed data. All constants ending in TRANSFER_MODE are used to indicate file transfer modes.
Field Value:
12

DEFAULT_CONTROL_ENCODING

public static final String DEFAULT_CONTROL_ENCODING

DEFAULT_DATA_PORT

public static final int DEFAULT_DATA_PORT
The default FTP data port (20). **
Field Value:
20

DEFAULT_PORT

public static final int DEFAULT_PORT
The default FTP control port (21). **
Field Value:
21

EBCDIC_FILE_TYPE

public static final int EBCDIC_FILE_TYPE
A constant used to indicate the file(s) being transfered should be treated as EBCDIC. Note however that there are several different EBCDIC formats. All constants ending in FILE_TYPE are used to indicate file types.
Field Value:
1

FILE_STRUCTURE

public static final int FILE_STRUCTURE
A constant used to indicate a file is to be treated as a continuous sequence of bytes. This is the default structure. All constants ending in _STRUCTURE are used to indicate file structure for file transfers.
Field Value:
7

LOCAL_FILE_TYPE

public static final int LOCAL_FILE_TYPE
A constant used to indicate the file(s) being transfered should be treated as a local type. All constants ending in FILE_TYPE are used to indicate file types.
Field Value:
3

NON_PRINT_TEXT_FORMAT

public static final int NON_PRINT_TEXT_FORMAT
A constant used for text files to indicate a non-print text format. This is the default format. All constants ending in TEXT_FORMAT are used to indicate text formatting for text transfers (both ASCII and EBCDIC).
Field Value:
4

PAGE_STRUCTURE

public static final int PAGE_STRUCTURE
A constant used to indicate a file is to be treated as a set of independent indexed pages. All constants ending in _STRUCTURE are used to indicate file structure for file transfers.
Field Value:
9

RECORD_STRUCTURE

public static final int RECORD_STRUCTURE
A constant used to indicate a file is to be treated as a sequence of records. All constants ending in _STRUCTURE are used to indicate file structure for file transfers.
Field Value:
8

STREAM_TRANSFER_MODE

public static final int STREAM_TRANSFER_MODE
A constant used to indicate a file is to be transfered as a stream of bytes. This is the default transfer mode. All constants ending in TRANSFER_MODE are used to indicate file transfer modes.
Field Value:
10

TELNET_TEXT_FORMAT

public static final int TELNET_TEXT_FORMAT
A constant used to indicate a text file contains format vertical format control characters. All constants ending in TEXT_FORMAT are used to indicate text formatting for text transfers (both ASCII and EBCDIC).
Field Value:
5

_commandSupport_

protected ProtocolCommandSupport _commandSupport_
A ProtocolCommandSupport object used to manage the registering of ProtocolCommandListeners and te firing of ProtocolCommandEvents.

_controlEncoding

protected String _controlEncoding

_controlInput_

protected BufferedReader _controlInput_
Wraps SocketClient._input_ to facilitate the writing of text to the FTP control connection. Do not access the control connection via SocketClient._input_. This member starts with a null value, is initialized in FTP, and set to null in FTP.

_controlOutput_

protected BufferedWriter _controlOutput_
Wraps SocketClient._output_ to facilitate the reading of text from the FTP control connection. Do not access the control connection via SocketClient._output_. This member starts with a null value, is initialized in FTP, and set to null in FTP.

_newReplyString

protected boolean _newReplyString

_replyCode

protected int _replyCode

_replyLines

protected ArrayList _replyLines

_replyString

protected String _replyString

strictMultilineParsing

protected boolean strictMultilineParsing
This is used to signal whether a block of multiline responses beginning with xxx must be terminated by the same numeric code xxx See section 4.2 of RFX 959 for details.

Constructor Details

FTP

public FTP()
The default FTP constructor. Sets the default port to DEFAULT_PORT and initializes internal data structures for saving FTP reply information.

Method Details

abor

public int abor()
            throws IOException
A convenience method to send the FTP ABOR command to the server, receive the reply, and return the reply code.

Returns:
The reply code received from the server.

acct

public int acct(String account)
            throws IOException
A convenience method to send the FTP ACCT command to the server, receive the reply, and return the reply code.

Parameters:
account - The account name to access.
Returns:
The reply code received from the server.

addProtocolCommandListener

public void addProtocolCommandListener(ProtocolCommandListener listener)
Parameters:
listener - The ProtocolCommandListener to add.

allo

public int allo(int bytes)
            throws IOException
A convenience method to send the FTP ALLO command to the server, receive the reply, and return the reply code.

Parameters:
bytes - The number of bytes to allocate.
Returns:
The reply code received from the server.

allo

public int allo(int bytes,
                int recordSize)
            throws IOException
A convenience method to send the FTP ALLO command to the server, receive the reply, and return the reply code.

Parameters:
bytes - The number of bytes to allocate.
recordSize - The size of a record.
Returns:
The reply code received from the server.

appe

public int appe(String pathname)
            throws IOException
Parameters:
pathname - The pathname to use for the file when stored at the remote end of the transfer.
Returns:
The reply code received from the server.

cdup

public int cdup()
            throws IOException
A convenience method to send the FTP CDUP command to the server, receive the reply, and return the reply code.

Returns:
The reply code received from the server.

cwd

public int cwd(String directory)
            throws IOException
A convenience method to send the FTP CWD command to the server, receive the reply, and return the reply code.

Parameters:
directory - The new working directory.
Returns:
The reply code received from the server.

dele

public int dele(String pathname)
            throws IOException
A convenience method to send the FTP DELE command to the server, receive the reply, and return the reply code.

Parameters:
pathname - The pathname to delete.
Returns:
The reply code received from the server.

getControlEncoding

public String getControlEncoding()
Returns:
The character encoding used to communicate over the control connection.

getReply

public int getReply()
            throws IOException
Fetches a reply from the FTP server and returns the integer reply code. After calling this method, the actual reply text can be accessed from either calling getReplyString or getReplyStrings. Only use this method if you are implementing your own FTP client or if you need to fetch a secondary response from the FTP server.

Returns:
The integer value of the reply code of the fetched FTP reply.

getReplyCode

public int getReplyCode()
Returns the integer value of the reply code of the last FTP reply. You will usually only use this method after you connect to the FTP server to check that the connection was successful since connect is of type void.

Returns:
The integer value of the reply code of the last FTP reply.

getReplyString

public String getReplyString()
Returns the entire text of the last FTP server response exactly as it was received, including all end of line markers in NETASCII format.

Returns:
The entire text from the last FTP response as a String.

getReplyStrings

public String[] getReplyStrings()
Returns the lines of text from the last FTP server response as an array of strings, one entry per line. The end of line markers of each are stripped from each line.

Returns:
The lines of text from the last FTP response as an array.

help

public int help()
            throws IOException
A convenience method to send the FTP HELP command to the server, receive the reply, and return the reply code.

Returns:
The reply code received from the server.

help

public int help(String command)
            throws IOException
A convenience method to send the FTP HELP command to the server, receive the reply, and return the reply code.

Parameters:
command - The command name on which to request help.
Returns:
The reply code received from the server.

isStrictMultilineParsing

public boolean isStrictMultilineParsing()
Return whether strict multiline parsing is enabled, as per RFX 959, section 4.2.
Returns:
True if strict, false if lenient
Since:
2.0

list

public int list()
            throws IOException
Returns:
The reply code received from the server.

list

public int list(String pathname)
            throws IOException
Parameters:
pathname - The pathname to list.
Returns:
The reply code received from the server.

mdtm

public int mdtm(String file)
            throws IOException
Since:
2.0

mkd

public int mkd(String pathname)
            throws IOException
A convenience method to send the FTP MKD command to the server, receive the reply, and return the reply code.

Parameters:
pathname - The pathname of the new directory to create.
Returns:
The reply code received from the server.

mode

public int mode(int mode)
            throws IOException
A convenience method to send the FTP MODE command to the server, receive the reply, and return the reply code.

Parameters:
mode - The transfer mode to use (one of the TRANSFER_MODE constants).
Returns:
The reply code received from the server.

nlst

public int nlst()
            throws IOException
Returns:
The reply code received from the server.

nlst

public int nlst(String pathname)
            throws IOException
Parameters:
pathname - The pathname to list.
Returns:
The reply code received from the server.

noop

public int noop()
            throws IOException
A convenience method to send the FTP NOOP command to the server, receive the reply, and return the reply code.

Returns:
The reply code received from the server.

pass

public int pass(String password)
            throws IOException
A convenience method to send the FTP PASS command to the server, receive the reply, and return the reply code.
Parameters:
password - The plain text password of the username being logged into.
Returns:
The reply code received from the server.

pasv

public int pasv()
            throws IOException
A convenience method to send the FTP PASV command to the server, receive the reply, and return the reply code. Remember, it's up to you to interpret the reply string containing the host/port information.

Returns:
The reply code received from the server.

port

public int port(InetAddress host,
                int port)
            throws IOException
A convenience method to send the FTP PORT command to the server, receive the reply, and return the reply code.

Parameters:
host - The host owning the port.
port - The new port.
Returns:
The reply code received from the server.

pwd

public int pwd()
            throws IOException
A convenience method to send the FTP PWD command to the server, receive the reply, and return the reply code.

Returns:
The reply code received from the server.

quit

public int quit()
            throws IOException
A convenience method to send the FTP QUIT command to the server, receive the reply, and return the reply code.

Returns:
The reply code received from the server.

rein

public int rein()
            throws IOException
A convenience method to send the FTP REIN command to the server, receive the reply, and return the reply code.

Returns:
The reply code received from the server.

removeProtocolCommandListener

public void removeProtocolCommandListener(ProtocolCommandListener listener)
Parameters:
listener - The ProtocolCommandListener to remove.

rest

public int rest(String marker)
            throws IOException
A convenience method to send the FTP REST command to the server, receive the reply, and return the reply code.

Parameters:
marker - The marker at which to restart a transfer.
Returns:
The reply code received from the server.

retr

public int retr(String pathname)
            throws IOException
Parameters:
pathname - The pathname of the file to retrieve.
Returns:
The reply code received from the server.

rmd

public int rmd(String pathname)
            throws IOException
A convenience method to send the FTP RMD command to the server, receive the reply, and return the reply code.

Parameters:
pathname - The pathname of the directory to remove.
Returns:
The reply code received from the server.

rnfr

public int rnfr(String pathname)
            throws IOException
A convenience method to send the FTP RNFR command to the server, receive the reply, and return the reply code.

Parameters:
pathname - The pathname to rename from.
Returns:
The reply code received from the server.

rnto

public int rnto(String pathname)
            throws IOException
A convenience method to send the FTP RNTO command to the server, receive the reply, and return the reply code.

Parameters:
pathname - The pathname to rename to
Returns:
The reply code received from the server.

sendCommand

public int sendCommand(String command)
            throws IOException
Parameters:
command - The text representation of the FTP command to send.
Returns:
The integer value of the FTP reply code returned by the server in response to the command.

sendCommand

public int sendCommand(String command,
                       String args)
            throws IOException
Parameters:
command - The text representation of the FTP command to send.
args - The arguments to the FTP command. If this parameter is set to null, then the command is sent with no argument.
Returns:
The integer value of the FTP reply code returned by the server in response to the command.

sendCommand

public int sendCommand(int command)
            throws IOException
Parameters:
command - The FTPCommand constant corresponding to the FTP command to send.
Returns:
The integer value of the FTP reply code returned by the server in response to the command.

sendCommand

public int sendCommand(int command,
                       String args)
            throws IOException
Parameters:
command - The FTPCommand constant corresponding to the FTP command to send.
args - The arguments to the FTP command. If this parameter is set to null, then the command is sent with no argument.
Returns:
The integer value of the FTP reply code returned by the server in response to the command.

setControlEncoding

public void setControlEncoding(String encoding)
Sets the character encoding used by the FTP control connection. Some FTP servers require that commands be issued in a non-ASCII encoding like UTF-8 so that filenames with multi-byte character representations (e.g, Big 8) can be specified.
Parameters:
encoding - The new character encoding for the control connection.

setStrictMultilineParsing

public void setStrictMultilineParsing(boolean strictMultilineParsing)
Set strict multiline parsing.
Parameters:
strictMultilineParsing -
Since:
2.0

site

public int site(String parameters)
            throws IOException
A convenience method to send the FTP SITE command to the server, receive the reply, and return the reply code.

Parameters:
parameters - The site parameters to send.
Returns:
The reply code received from the server.

smnt

public int smnt(String dir)
            throws IOException
A convenience method to send the FTP SMNT command to the server, receive the reply, and return the reply code.

Parameters:
dir - The directory name.
Returns:
The reply code received from the server.

stat

public int stat()
            throws IOException
A convenience method to send the FTP STAT command to the server, receive the reply, and return the reply code.

Returns:
The reply code received from the server.

stat

public int stat(String pathname)
            throws IOException
A convenience method to send the FTP STAT command to the server, receive the reply, and return the reply code.

Parameters:
pathname - A pathname to list.
Returns:
The reply code received from the server.

stor

public int stor(String pathname)
            throws IOException
Parameters:
pathname - The pathname to use for the file when stored at the remote end of the transfer.
Returns:
The reply code received from the server.

stou

public int stou()
            throws IOException
Returns:
The reply code received from the server.

stou

public int stou(String pathname)
            throws IOException
Parameters:
pathname - The base pathname to use for the file when stored at the remote end of the transfer. Some FTP servers require this.
Returns:
The reply code received from the server.

stru

public int stru(int structure)
            throws IOException
A convenience method to send the FTP STRU command to the server, receive the reply, and return the reply code.

Parameters:
structure - The structure of the file (one of the _STRUCTURE constants).
Returns:
The reply code received from the server.

syst

public int syst()
            throws IOException
A convenience method to send the FTP SYST command to the server, receive the reply, and return the reply code.

Returns:
The reply code received from the server.

type

public int type(int fileType)
            throws IOException
A convenience method to send the FTP TYPE command to the server, receive the reply, and return the reply code.

Parameters:
fileType - The type of the file (one of the FILE_TYPE constants).
Returns:
The reply code received from the server.

type

public int type(int fileType,
                int formatOrByteSize)
            throws IOException
A convenience method to send the FTP TYPE command for text files to the server, receive the reply, and return the reply code.
Parameters:
fileType - The type of the file (one of the FILE_TYPE constants).
formatOrByteSize - The format of the file (one of the _FORMAT constants. In the case of LOCAL_FILE_TYPE, the byte size.
Returns:
The reply code received from the server.

user

public int user(String username)
            throws IOException
A convenience method to send the FTP USER command to the server, receive the reply, and return the reply code.

Parameters:
username - The username to login under.
Returns:
The reply code received from the server.

void _connectAction_

protected @Override void _connectAction_()
            throws IOException

void disconnect

public @Override void disconnect()
            throws IOException