org.apache.commons.net.tftp

Class TFTPClient

java.lang.Object
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+--org.apache.commons.net.DatagramSocketClient
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   +--org.apache.commons.net.tftp.TFTP
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      +--org.apache.commons.net.tftp.TFTPClient

public class TFTPClient
extends TFTP

The TFTPClient class encapsulates all the aspects of the TFTP protocol necessary to receive and send files through TFTP. It is derived from the TFTP class because it is more convenient than using aggregation, and as a result exposes the same set of methods to allow you to deal with the TFTP protocol directly. However, almost every user should only be concerend with the the open() , close() , sendFile() , and receiveFile() methods. Additionally, the setMaxTimeouts() and setDefaultTimeout() methods may be of importance for performance tuning.

Details regarding the TFTP protocol and the format of TFTP packets can be found in RFC 783. But the point of these classes is to keep you from having to worry about the internals.

Author:

Daniel F. Savarese

Field Summary

static int

DEFAULT_MAX_TIMEOUTS

The default number of times a receive attempt is allowed to timeout before ending attempts to retry the receive and failing.

Constructor Summary

TFTPClient()

Creates a TFTPClient instance with a default timeout of DEFAULT_TIMEOUT, maximum timeouts value of DEFAULT_MAX_TIMEOUTS, a null socket, and buffered operations disabled.

Method Summary

int	getMaxTimeouts() Returns the maximum number of times a receive attempt is allowed to timeout before ending attempts to retry the receive and failing.
int	receiveFile(String filename, int mode, OutputStream output, InetAddress host, int port) Requests a named file from a remote host, writes the file to an OutputStream, closes the connection, and returns the number of bytes read.
int	receiveFile(String filename, int mode, OutputStream output, String hostname, int port) Requests a named file from a remote host, writes the file to an OutputStream, closes the connection, and returns the number of bytes read.
int	receiveFile(String filename, int mode, OutputStream output, InetAddress host) Same as calling receiveFile(filename, mode, output, host, TFTP.DEFAULT_PORT).
int	receiveFile(String filename, int mode, OutputStream output, String hostname) Same as calling receiveFile(filename, mode, output, hostname, TFTP.DEFAULT_PORT).
void	sendFile(String filename, int mode, InputStream input, InetAddress host, int port) Requests to send a file to a remote host, reads the file from an InputStream, sends the file to the remote host, and closes the connection.
void	sendFile(String filename, int mode, InputStream input, String hostname, int port) Requests to send a file to a remote host, reads the file from an InputStream, sends the file to the remote host, and closes the connection.
void	sendFile(String filename, int mode, InputStream input, InetAddress host) Same as calling sendFile(filename, mode, input, host, TFTP.DEFAULT_PORT).
void	sendFile(String filename, int mode, InputStream input, String hostname) Same as calling sendFile(filename, mode, input, hostname, TFTP.DEFAULT_PORT).
void	setMaxTimeouts(int numTimeouts) Sets the maximum number of times a receive attempt is allowed to timeout during a receiveFile() or sendFile() operation before ending attempts to retry the receive and failing.

Field Details

DEFAULT_MAX_TIMEOUTS

public static final int DEFAULT_MAX_TIMEOUTS

The default number of times a receive attempt is allowed to timeout before ending attempts to retry the receive and failing. The default is 5 timeouts.

Constructor Details

TFTPClient

public TFTPClient()

Creates a TFTPClient instance with a default timeout of DEFAULT_TIMEOUT, maximum timeouts value of DEFAULT_MAX_TIMEOUTS, a null socket, and buffered operations disabled.

Method Details

getMaxTimeouts

public int getMaxTimeouts()

Returns the maximum number of times a receive attempt is allowed to timeout before ending attempts to retry the receive and failing.

Returns:

The maximum number of timeouts allowed.

receiveFile

public int receiveFile(String filename, int mode, OutputStream output, InetAddress host)

Same as calling receiveFile(filename, mode, output, host, TFTP.DEFAULT_PORT).

Parameters:

filename - The name of the file to receive.
mode - The TFTP mode of the transfer (one of the MODE constants).
output - The OutputStream to which the file should be written.
host - The remote host serving the file.

Throws:

- If an I/O error occurs.

receiveFile

public int receiveFile(String filename, int mode, OutputStream output, InetAddress host, int port)

Requests a named file from a remote host, writes the file to an OutputStream, closes the connection, and returns the number of bytes read. A local UDP socket must first be created by open() before invoking this method. This method will not close the OutputStream containing the file; you must close it after the method invocation.

Parameters:

filename - The name of the file to receive.
mode - The TFTP mode of the transfer (one of the MODE constants).
output - The OutputStream to which the file should be written.
host - The remote host serving the file.
port - The port number of the remote TFTP server.

Throws:

- If an I/O error occurs.

receiveFile

public int receiveFile(String filename, int mode, OutputStream output, String hostname)

Same as calling receiveFile(filename, mode, output, hostname, TFTP.DEFAULT_PORT).

Parameters:

filename - The name of the file to receive.
mode - The TFTP mode of the transfer (one of the MODE constants).
output - The OutputStream to which the file should be written.
hostname - The name of the remote host serving the file.

Throws:

- If an I/O error occurs.
- If the hostname cannot be resolved.

receiveFile

public int receiveFile(String filename, int mode, OutputStream output, String hostname, int port)

Parameters:

filename - The name of the file to receive.
mode - The TFTP mode of the transfer (one of the MODE constants).
output - The OutputStream to which the file should be written.
hostname - The name of the remote host serving the file.
port - The port number of the remote TFTP server.

Throws:

- If an I/O error occurs.
- If the hostname cannot be resolved.

sendFile

public void sendFile(String filename, int mode, InputStream input, InetAddress host)

Same as calling sendFile(filename, mode, input, host, TFTP.DEFAULT_PORT).

Parameters:

filename - The name the remote server should use when creating the file on its file system.
mode - The TFTP mode of the transfer (one of the MODE constants).
input - The name of the remote host receiving the file.
host

Throws:

- If an I/O error occurs.
- If the hostname cannot be resolved.

sendFile

public void sendFile(String filename, int mode, InputStream input, InetAddress host, int port)

Requests to send a file to a remote host, reads the file from an InputStream, sends the file to the remote host, and closes the connection. A local UDP socket must first be created by open() before invoking this method. This method will not close the InputStream containing the file; you must close it after the method invocation.

Parameters:

filename - The name the remote server should use when creating the file on its file system.
mode - The TFTP mode of the transfer (one of the MODE constants).
input - The remote host receiving the file.
host - The port number of the remote TFTP server.
port

Throws:

- If an I/O error occurs.

sendFile

public void sendFile(String filename, int mode, InputStream input, String hostname)

Same as calling sendFile(filename, mode, input, hostname, TFTP.DEFAULT_PORT).

Parameters:

filename - The name the remote server should use when creating the file on its file system.
mode - The TFTP mode of the transfer (one of the MODE constants).
input - The name of the remote host receiving the file.
hostname

Throws:

- If an I/O error occurs.
- If the hostname cannot be resolved.

sendFile

public void sendFile(String filename, int mode, InputStream input, String hostname, int port)

Parameters:

filename - The name the remote server should use when creating the file on its file system.
mode - The TFTP mode of the transfer (one of the MODE constants).
input - The name of the remote host receiving the file.
hostname - The port number of the remote TFTP server.
port

Throws:

- If an I/O error occurs.
- If the hostname cannot be resolved.

setMaxTimeouts

public void setMaxTimeouts(int numTimeouts)

Sets the maximum number of times a receive attempt is allowed to timeout during a receiveFile() or sendFile() operation before ending attempts to retry the receive and failing. The default is DEFAULT_MAX_TIMEOUTS.

Parameters:

numTimeouts - The maximum number of timeouts to allow.