Package com.enterprisedt.net.ftp

Class FileTransferClient

java.lang.Object

com.enterprisedt.net.ftp.FileTransferClient

All Implemented Interfaces:

FileTransferClientInterface

public class FileTransferClient
extends Object
implements FileTransferClientInterface

Easy to use FTP client that is thread safe and provides true FTP streams. This class is intended to replace FTPClient, which will eventually be deprecated.

Version:

$Revision$

Author:

Bruce Blackshaw

Field Summary

Fields

Modifier and Type	Field	Description
protected com.enterprisedt.net.ftp.internal.EventAggregator	eventAggregator
protected EventListener	listener	Event listeners
protected com.enterprisedt.net.ftp.internal.ConnectionContext	masterContext	Context for the client that is the starting point for all new tasks.

Constructor Summary

Constructors

Constructor	Description
FileTransferClient()	Default constructor

Method Summary

Modifier and Type	Method	Description
void	cancelAllTransfers()	Cancel current transfer if underway
void	changeDirectory(String directoryName)	Change directory on the FTP server.
void	changeToParentDirectory()	Change to parent directory on the FTP server.
protected void	checkConnection(boolean shouldBeConnected)	Checks if the client has connected to the server and throws an exception if it hasn't.
void	connect()	Make a connection to the FTP server.
void	createDirectory(String directoryName)	Create directory on the FTP server.
void	deleteDirectory(String directoryName)	Delete directory on the FTP server.
void	deleteFile(String remoteFileName)	Deletes a remote file.
FTPFile[]	directoryList()	List the current directory on the FTP server.
FTPFile[]	directoryList(String directoryName)	List a directory on the FTP server.
void	directoryList(String directoryName, DirectoryListCallback lister)	List a directory on the FTP server.
String[]	directoryNameList()	List the names of files and directories in the current directory on the FTP server.
String[]	directoryNameList(String directoryName, boolean isLongListing)	List the names of files and directories of a directory on the FTP server.
void	disconnect()	Disconnect from the FTP server.
void	disconnect(boolean immediate)	Disconnect from the FTP server.
byte[]	downloadByteArray(String remoteFileName)	Download a file from the FTP server into a byte array.
void	downloadFile(String localFileName, String remoteFileName)	Download a file from the FTP server .
void	downloadFile(String localFileName, String remoteFileName, WriteMode writeMode)	Download a file from the FTP server .
FileTransferInputStream	downloadStream(String remoteFileName)	Download a file from the FTP server as a stream.
static void	downloadURLFile(String localFileName, String ftpURL)	Downloads the given file to the given FTP URL.
static FileTransferInputStream	downloadURLStream(String ftpURL)	Open an InputStream for the given FTP URL.
String	executeCommand(String command)	Request that the remote server execute the literal command supplied.
boolean	exists(String remoteFileName)	Determine if a remote file exists.
AdvancedFTPSettings	getAdvancedFTPSettings()	Get the advanced FTP configuration parameters object
AdvancedGeneralSettings	getAdvancedSettings()	Get the advanced general configuration parameters object, for none protocol specific parameters
FTPTransferType	getContentType()	Get the current content type for all connections.
FTPReply	getLastReply()	Gets the last reply from the server, whether valid or not
Date	getModifiedTime(String remoteFileName)	Get the modified-time of a remote file.
int	getNetworkBufferSize()	Get the size of the network buffers (SO_SNDBUF and SO_RCVBUF).
String	getPassword()	Get the current user password.
String	getRemoteDirectory()	Get the current remote directory.
String	getRemoteHost()	Returns the IP address or name of the remote host.
int	getRemotePort()	Returns the port being connected to on the remote server.
long	getSize(String remoteFileName)	Get the size of a remote file.
FileStatistics	getStatistics()	Get statistics on file transfers and deletions.
String	getSystemType()	Get a string that represents the remote system that the client is logged into.
int	getTimeout()	Returns the timeout for socket connections.
String	getUserName()	Get the current user name.
boolean	isConnected()	Is this client currently connected to the server?
boolean	isDetectContentType()	Get the detect content type flag
void	manualLogin()	Perform a manual login using the credentials that have been set.
protected static void	prepareURLTransfer(URL url, FileTransferClientInterface client)
void	rename(String renameFromName, String renameToName)	Rename a remote file or directory.
void	setContentType(FTPTransferType type)	Set the transfer type for all connections, either ASCII or binary.
void	setDetectContentType(boolean detectContentType)	Set auto detect of filetypes on or off.
void	setEventListener(EventListener listener)	Set the event listener for transfer event notification
void	setModifiedTime(String remoteFileName, Date modifiedTime)	Set the modified-time of a remote file.
void	setNetworkBufferSize(int networkBufferSize)	Set the size of the network buffers (SO_SNDBUF and SO_RCVBUF).
void	setPassword(String password)	Set the password of the user to log in with.
void	setRemoteHost(String remoteHost)	Set the IP address or name of the remote host This may only be done if the client is not already connected to the server.
void	setRemotePort(int remotePort)	Set the port to connect to on the remote server.
void	setTimeout(int timeout)	Set the timeout for socket connections.
void	setUserName(String userName)	Set the name of the user to log in with.
String	uploadFile(String localFileName, String remoteFileName)	Upload a file to the FTP server.
String	uploadFile(String localFileName, String remoteFileName, WriteMode writeMode)	Upload a file to the FTP server.
FileTransferOutputStream	uploadStream(String remoteFileName)	Upload a file to the FTP server by writing to a stream.
FileTransferOutputStream	uploadStream(String remoteFileName, WriteMode writeMode)	Upload a file to the FTP server by writing to a stream.
static void	uploadURLFile(String localFileName, String ftpURL)	Uploads the given file to the given FTP URL.
static FileTransferOutputStream	uploadURLStream(String ftpURL)	Open an OutputStream for the given FTP URL.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

masterContext

protected com.enterprisedt.net.ftp.internal.ConnectionContext masterContext

Context for the client that is the starting point for all new tasks. If we have a change directory task, when it is completed it will update this master context and the updated context will be used for all future tasks

eventAggregator

protected com.enterprisedt.net.ftp.internal.EventAggregator eventAggregator

listener

protected EventListener listener

Event listeners

Constructor Details

FileTransferClient

public FileTransferClient()

Default constructor

Method Details

checkConnection

protected void checkConnection(boolean shouldBeConnected)
                        throws FTPException

Checks if the client has connected to the server and throws an exception if it hasn't. This is only intended to be used by subclasses

Throws:

FTPException - Thrown if the client has not connected to the server.

isConnected

public boolean isConnected()

Is this client currently connected to the server?

Specified by:

isConnected in interface FileTransferClientInterface

Returns:

true if connected, false otherwise

getRemoteHost

public String getRemoteHost()

Returns the IP address or name of the remote host.

Specified by:

getRemoteHost in interface FileTransferClientInterface

Returns:

Returns the remote host.

setRemoteHost

public void setRemoteHost(String remoteHost)
                   throws FTPException

Set the IP address or name of the remote host This may only be done if the client is not already connected to the server.

Specified by:

setRemoteHost in interface FileTransferClientInterface

Parameters:

remoteHost - The IP address or name of the remote host

Throws:

FTPException - Thrown if the client is already connected to the server.

getTimeout

public int getTimeout()

Returns the timeout for socket connections.

Specified by:

getTimeout in interface FileTransferClientInterface

Returns:

Returns the connection timeout in milliseconds

setTimeout

public void setTimeout(int timeout)
                throws FTPException

Set the timeout for socket connections. Can only do this if not already connected.

Specified by:

setTimeout in interface FileTransferClientInterface

Parameters:

timeout - the timeout to use in milliseconds

Throws:

FTPException - Thrown if the client is already connected to the server.

getNetworkBufferSize

public int getNetworkBufferSize()

Get the size of the network buffers (SO_SNDBUF and SO_RCVBUF).

Specified by:

getNetworkBufferSize in interface FileTransferClientInterface

Returns:

network buffer size

setNetworkBufferSize

public void setNetworkBufferSize(int networkBufferSize)
                          throws FTPException

Set the size of the network buffers (SO_SNDBUF and SO_RCVBUF).

Specified by:

setNetworkBufferSize in interface FileTransferClientInterface

Parameters:

networkBufferSize - new buffer size to set

Throws:

FTPException

getRemotePort

public int getRemotePort()

Returns the port being connected to on the remote server.

Specified by:

getRemotePort in interface FileTransferClientInterface

Returns:

Returns the port being connected to on the remote server.

setRemotePort

public void setRemotePort(int remotePort)
                   throws FTPException

Set the port to connect to on the remote server. Can only do this if not already connected.

Specified by:

setRemotePort in interface FileTransferClientInterface

Parameters:

remotePort - The port to use.

Throws:

FTPException - Thrown if the client is already connected to the server.

setContentType

public void setContentType(FTPTransferType type)
                    throws IOException,
FTPException

Set the transfer type for all connections, either ASCII or binary. Setting applies to all subsequent transfers that are initiated.

Specified by:

setContentType in interface FileTransferClientInterface

Parameters:

type - transfer type

Throws:

FTPException

IOException

FTPException

getContentType

public FTPTransferType getContentType()

Get the current content type for all connections.

Specified by:

getContentType in interface FileTransferClientInterface

Returns:

transfer type

setDetectContentType

public void setDetectContentType(boolean detectContentType)

Set auto detect of filetypes on or off. If on, the transfer mode is switched from ASCII to binary and vice versa depending on the extension of the file. After the transfer, the mode is always returned to what it was before the transfer was performed. The default is off. If the filetype is unknown, the transfer mode is unchanged

Specified by:

setDetectContentType in interface FileTransferClientInterface

Parameters:

detectContentType - true if detecting content type, false if not

isDetectContentType

public boolean isDetectContentType()

Get the detect content type flag

Specified by:

isDetectContentType in interface FileTransferClientInterface

Returns:

true if we are detecting binary and ASCII transfers from the file type

setUserName

public void setUserName(String userName)
                 throws FTPException

Set the name of the user to log in with. Can only do this if not already connected.

Specified by:

setUserName in interface FileTransferClientInterface

Parameters:

userName - user-name to log in with.

Throws:

FTPException

getPassword

public String getPassword()

Get the current user password.

Specified by:

getPassword in interface FileTransferClientInterface

Returns:

current user password

setPassword

public void setPassword(String password)
                 throws FTPException

Set the password of the user to log in with. Can only do this if not already connected.

Specified by:

setPassword in interface FileTransferClientInterface

Parameters:

password - password to log in with.

Throws:

FTPException

getUserName

public String getUserName()

Get the current user name.

Specified by:

getUserName in interface FileTransferClientInterface

Returns:

current user name

getAdvancedFTPSettings

public AdvancedFTPSettings getAdvancedFTPSettings()

Get the advanced FTP configuration parameters object

Specified by:

getAdvancedFTPSettings in interface FileTransferClientInterface

Returns:

advanced parameters

getAdvancedSettings

public AdvancedGeneralSettings getAdvancedSettings()

Get the advanced general configuration parameters object, for none protocol specific parameters

Specified by:

getAdvancedSettings in interface FileTransferClientInterface

Returns:

advanced parameters

setEventListener

public void setEventListener(EventListener listener)

Set the event listener for transfer event notification

Specified by:

setEventListener in interface FileTransferClientInterface

Parameters:

listener - event listener reference

connect

public void connect()
             throws FTPException,
IOException

Make a connection to the FTP server.

Specified by:

connect in interface FileTransferClientInterface

Throws:

FTPException

IOException

manualLogin

public void manualLogin()
                 throws FTPException,
IOException

Perform a manual login using the credentials that have been set. This should only be performed if auto login is disabled - normally connect() performs the login automatically.

Throws:

FTPException

IOException

prepareURLTransfer

protected static void prepareURLTransfer(URL url,
 FileTransferClientInterface client)
                                  throws IOException,
FTPException

Throws:

IOException

FTPException

getStatistics

public FileStatistics getStatistics()

Get statistics on file transfers and deletions.

Specified by:

getStatistics in interface FileTransferClientInterface

Returns:

FTPStatistics

executeCommand

public String executeCommand(String command)
                      throws FTPException,
IOException

Request that the remote server execute the literal command supplied. In FTP, this is the equivalent of 'quote'. It could be used to send a SITE command to the server, e.g. "SITE recfm=FB lrecl=180 blksize=5400".

Specified by:

executeCommand in interface FileTransferClientInterface

Parameters:

command - command string

Returns:

result string returned by server

Throws:

FTPException

IOException

cancelAllTransfers

public void cancelAllTransfers()

Cancel current transfer if underway

Specified by:

cancelAllTransfers in interface FileTransferClientInterface

getLastReply

public FTPReply getLastReply()

Gets the last reply from the server, whether valid or not

Returns:

reply object encapsulating last server response

getSystemType

public String getSystemType()
                     throws FTPException,
IOException

Get a string that represents the remote system that the client is logged into.

Specified by:

getSystemType in interface FileTransferClientInterface

Returns:

system string

Throws:

FTPException

IOException

directoryNameList

public String[] directoryNameList()
                           throws FTPException,
IOException

List the names of files and directories in the current directory on the FTP server. Most servers return an empty directory listing if a directory does not exist, and this is also what this method does. To establish whether or not a directory exists, try changing into it.

Specified by:

directoryNameList in interface FileTransferClientInterface

Returns:

String[]

Throws:

FTPException

IOException

directoryNameList

public String[] directoryNameList(String directoryName,
 boolean isLongListing)
                           throws FTPException,
IOException

List the names of files and directories of a directory on the FTP server. Most servers return an empty directory listing if a directory does not exist, and this is also what this method does. To establish whether or not a directory exists, try changing into it.

Specified by:

directoryNameList in interface FileTransferClientInterface

Parameters:

directoryName - name of the directory (generally not a path). Some servers will accept a wildcard.

isLongListing - true if the listing is a long format listing

Returns:

String[]

Throws:

FTPException

IOException

directoryList

public FTPFile[] directoryList()
                        throws FTPException,
IOException,
ParseException

List the current directory on the FTP server. Most servers return an empty directory listing if a directory does not exist, and this is also what this method does. To establish whether or not a directory exists, try changing into it.

Specified by:

directoryList in interface FileTransferClientInterface

Throws:

ParseException

FTPException

IOException

directoryList

public FTPFile[] directoryList(String directoryName)
                        throws FTPException,
IOException,
ParseException

List a directory on the FTP server. Most servers return an empty directory listing if a directory does not exist, and this is also what this method does. To establish whether or not a directory exists, try changing into it.

Specified by:

directoryList in interface FileTransferClientInterface

Parameters:

directoryName - name of the directory (generally not a path). Some servers will accept a wildcard.

Throws:

ParseException

FTPException

IOException

directoryList

public void directoryList(String directoryName,
 DirectoryListCallback lister)
                   throws FTPException,
IOException,
ParseException

List a directory on the FTP server. Most servers return an empty directory listing if a directory does not exist, and this is also what this method does. To establish whether or not a directory exists, try changing into it.

Specified by:

directoryList in interface FileTransferClientInterface

Parameters:

directoryName - name of the directory (generally not a path)

Throws:

FTPException

IOException

ParseException

downloadByteArray

public byte[] downloadByteArray(String remoteFileName)
                         throws FTPException,
IOException

Download a file from the FTP server into a byte array.

Specified by:

downloadByteArray in interface FileTransferClientInterface

Parameters:

remoteFileName - name of the remote file to be downloaded

Throws:

FTPException

IOException

downloadFile

public void downloadFile(String localFileName,
 String remoteFileName)
                  throws FTPException,
IOException

Download a file from the FTP server .

Specified by:

downloadFile in interface FileTransferClientInterface

Parameters:

localFileName - name (or full path) of the local file to be downloaded to

remoteFileName - name of the remote file to be downloaded

Throws:

FTPException

IOException

downloadFile

public void downloadFile(String localFileName,
 String remoteFileName,
 WriteMode writeMode)
                  throws FTPException,
IOException

Download a file from the FTP server .

Specified by:

downloadFile in interface FileTransferClientInterface

Parameters:

localFileName - name (or full path) of the local file to be downloaded to

remoteFileName - name of the remote file to be downloaded

writeMode - mode in which the file is written to the client machine

Throws:

FTPException

IOException

downloadURLStream

public static FileTransferInputStream downloadURLStream(String ftpURL)
                                                 throws MalformedURLException,
IOException,
FTPException

Open an InputStream for the given FTP URL. The URL must be of the form ftp://[user[:password]@]host[:port]/path. The stream should be closed when the transfer is complete.

Parameters:

ftpURL - The URL must be of the form ftp://[user[:password]@]host[:port]/path.

Returns:

FileTransferInputStream for the given URL. The stream should be closed when the transfer is complete.

Throws:

MalformedURLException - Thrown when an invalid URL is provided.

IOException - Thrown when an I/O-related error occurs.

FTPException - Thrown when an FTP-protocol-related error occurs.

downloadURLFile

public static void downloadURLFile(String localFileName,
 String ftpURL)
                            throws MalformedURLException,
IOException,
FTPException

Downloads the given file to the given FTP URL. The URL must be of the form ftp://[user[:password]@]host[:port]/path.

Parameters:

localFileName - Path to local file

ftpURL - The URL must be of the form ftp://[user[:password]@]host[:port]/path.

Throws:

MalformedURLException - Thrown when an invalid URL is provided.

IOException - Thrown when an I/O-related error occurs.

FTPException - Thrown when an FTP-protocol-related error occurs.

downloadStream

public FileTransferInputStream downloadStream(String remoteFileName)
                                       throws FTPException,
IOException

Download a file from the FTP server as a stream. The close() method must be called on the stream once the stream has been read.

Specified by:

downloadStream in interface FileTransferClientInterface

Parameters:

remoteFileName - name of the remote file to be downloaded

Returns:

InputStream

Throws:

FTPException

IOException

uploadFile

public String uploadFile(String localFileName,
 String remoteFileName)
                  throws FTPException,
IOException

Upload a file to the FTP server. If a null is supplied as the remoteFileName, the STOU (store unique) FTP feature will be used (if available) and the FTP server will generate a unique name for the file.

Specified by:

uploadFile in interface FileTransferClientInterface

Parameters:

localFileName - name (or full path) of the local file to be downloaded to

remoteFileName - name of the remote file to be downloaded (or null to generate a unique name)

Returns:

name of remote file

Throws:

FTPException

IOException

uploadFile

public String uploadFile(String localFileName,
 String remoteFileName,
 WriteMode writeMode)
                  throws FTPException,
IOException

Upload a file to the FTP server. If a null is supplied as the remoteFileName, the STOU (store unique) FTP feature will be used (if available) and the FTP server will generate a unique name for the file.

Specified by:

uploadFile in interface FileTransferClientInterface

Parameters:

localFileName - name (or full path) of the local file to be downloaded to

remoteFileName - name of the remote file to be downloaded (or null to generate a unique name)

writeMode - mode to write to the remote file with

Returns:

name of remote file

Throws:

FTPException

IOException

uploadStream

public FileTransferOutputStream uploadStream(String remoteFileName)
                                      throws FTPException,
IOException

Upload a file to the FTP server by writing to a stream. The close() method must be called on the stream once the stream has been read. If a null is supplied as the remoteFileName, the STOU (store unique) FTP feature will be used (if available) and the FTP server will generate a unique name for the file. This name can be obtained afterwards from

Specified by:

uploadStream in interface FileTransferClientInterface

Parameters:

remoteFileName - name of the remote file to be uploaded

Returns:

FileTransferOutputStream

Throws:

FTPException

IOException

uploadStream

public FileTransferOutputStream uploadStream(String remoteFileName,
 WriteMode writeMode)
                                      throws FTPException,
IOException

Upload a file to the FTP server by writing to a stream. The close() method *must* be called on the stream once the stream has been read. If a null is supplied as the remoteFileName, the STOU (store unique) FTP feature will be used (if available) and the FTP server will generate a unique name for the file. This name can be obtained afterwards from

Specified by:

uploadStream in interface FileTransferClientInterface

Parameters:

remoteFileName - name of the remote file to be uploaded

writeMode - mode for writing to the server (supporting use of append)

Returns:

FileTransferOutputStream

Throws:

FTPException

IOException

uploadURLStream

public static FileTransferOutputStream uploadURLStream(String ftpURL)
                                                throws MalformedURLException,
IOException,
FTPException

Open an OutputStream for the given FTP URL. The URL must be of the form ftp://[user[:password]@]host[:port]/path. The stream should be closed when the transfer is complete.

Parameters:

ftpURL - The URL must be of the form ftp://[user[:password]@]host[:port]/path.

Returns:

FileTransferOutputStream for the given URL. The stream should be closed when the transfer is complete.

Throws:

MalformedURLException - Thrown when an invalid URL is provided.

IOException - Thrown when an I/O-related error occurs.

FTPException - Thrown when an FTP-protocol-related error occurs.

uploadURLFile

public static void uploadURLFile(String localFileName,
 String ftpURL)
                          throws MalformedURLException,
IOException,
FTPException

Uploads the given file to the given FTP URL. The URL must be of the form ftp://[user[:password]@]host[:port]/path.

Parameters:

localFileName - Path to local file

ftpURL - The URL must be of the form ftp://[user[:password]@]host[:port]/path.

Throws:

MalformedURLException - Thrown when an invalid URL is provided.

IOException - Thrown when an I/O-related error occurs.

FTPException - Thrown when an FTP-protocol-related error occurs.

getSize

public long getSize(String remoteFileName)
             throws FTPException,
IOException

Get the size of a remote file.

Specified by:

getSize in interface FileTransferClientInterface

Parameters:

remoteFileName - name of remote file

Returns:

long

Throws:

FTPException

IOException

getModifiedTime

public Date getModifiedTime(String remoteFileName)
                     throws FTPException,
IOException

Get the modified-time of a remote file.

Specified by:

getModifiedTime in interface FileTransferClientInterface

Parameters:

remoteFileName - name of remote file

Returns:

Date

Throws:

FTPException

IOException

setModifiedTime

public void setModifiedTime(String remoteFileName,
 Date modifiedTime)
                     throws FTPException,
IOException

Set the modified-time of a remote file. May not be supported by all servers.

Specified by:

setModifiedTime in interface FileTransferClientInterface

Parameters:

remoteFileName - name of remote file

modifiedTime - new modified time

Throws:

FTPException

IOException

exists

public boolean exists(String remoteFileName)
               throws FTPException,
IOException

Determine if a remote file exists.

Specified by:

exists in interface FileTransferClientInterface

Parameters:

remoteFileName - name of remote file

Throws:

FTPException

IOException

deleteFile

public void deleteFile(String remoteFileName)
                throws FTPException,
IOException

Deletes a remote file.

Specified by:

deleteFile in interface FileTransferClientInterface

Parameters:

remoteFileName - name of remote file

Throws:

FTPException

IOException

rename

public void rename(String renameFromName,
 String renameToName)
            throws FTPException,
IOException

Rename a remote file or directory.

Specified by:

rename in interface FileTransferClientInterface

Parameters:

renameFromName - original name

renameToName - new name

Throws:

FTPException

IOException

changeDirectory

public void changeDirectory(String directoryName)
                     throws FTPException,
IOException

Change directory on the FTP server.

Specified by:

changeDirectory in interface FileTransferClientInterface

Parameters:

directoryName - name the remote directory to change into

Throws:

FTPException

IOException

changeToParentDirectory

public void changeToParentDirectory()
                             throws FTPException,
IOException

Change to parent directory on the FTP server.

Specified by:

changeToParentDirectory in interface FileTransferClientInterface

Throws:

FTPException

IOException

getRemoteDirectory

public String getRemoteDirectory()
                          throws IOException,
FTPException

Get the current remote directory.

Specified by:

getRemoteDirectory in interface FileTransferClientInterface

Returns:

current remote directory

Throws:

IOException

FTPException

createDirectory

public void createDirectory(String directoryName)
                     throws FTPException,
IOException

Create directory on the FTP server.

Specified by:

createDirectory in interface FileTransferClientInterface

Parameters:

directoryName - name the remote directory to create

Throws:

FTPException

IOException

deleteDirectory

public void deleteDirectory(String directoryName)
                     throws FTPException,
IOException

Delete directory on the FTP server. The directory must be empty. Note that edtFTPj/PRO supports recursive directory deletions.

Specified by:

deleteDirectory in interface FileTransferClientInterface

Parameters:

directoryName - name the remote directory to create

Throws:

FTPException

IOException

disconnect

public void disconnect()
                throws FTPException,
IOException

Disconnect from the FTP server.

Specified by:

disconnect in interface FileTransferClientInterface

Throws:

FTPException

IOException

disconnect

public void disconnect(boolean immediate)
                throws FTPException,
IOException

Disconnect from the FTP server.

Specified by:

disconnect in interface FileTransferClientInterface

Throws:

FTPException

IOException