org.apache.commons.net
Class EchoUDPClient

java.lang.Object
  org.apache.commons.net.DatagramSocketClient
      org.apache.commons.net.DiscardUDPClient
          org.apache.commons.net.EchoUDPClient

public final class EchoUDPClient
extends DiscardUDPClient

The EchoUDPClient class is a UDP implementation of a client for the Echo protocol described in RFC 862. To use the class, just open a local UDP port with open and call send to send datagrams to the server, then call receive to receive echoes. After you're done echoing data, call close() to clean up properly.

Author:

Daniel F. Savarese

See Also:

EchoTCPClient, DiscardUDPClient

Field Summary

static int

DEFAULT_PORT The default echo port.

Fields inherited from class org.apache.commons.net.DatagramSocketClient

_isOpen_, _socket_, _socketFactory_, _timeout_

Constructor Summary

EchoUDPClient()

Method Summary

int	receive(byte[] data) Same as receive(data, data.length)
int	receive(byte[] data, int length) Receives echoed data and returns its length.
void	send(byte[] data, InetAddress host) Same as send(data, data.length, host)
void	send(byte[] data, int length, InetAddress host) Sends the specified data to the specified server at the default echo port.

Methods inherited from class org.apache.commons.net.DiscardUDPClient

send

Methods inherited from class org.apache.commons.net.DatagramSocketClient

close, getDefaultTimeout, getLocalAddress, getLocalPort, getSoTimeout, isOpen, open, open, open, setDatagramSocketFactory, setDefaultTimeout, setSoTimeout

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_PORT

public static final int DEFAULT_PORT

The default echo port. It is set to 7 according to RFC 862.

See Also:

Constant Field Values

Constructor Detail

EchoUDPClient

public EchoUDPClient()

Method Detail

send

public void send(byte[] data,
                 int length,
                 InetAddress host)
          throws IOException

Sends the specified data to the specified server at the default echo port.

Overrides:

send in class DiscardUDPClient

Parameters:

data - The echo data to send.

length - The length of the data to send. Should be less than or equal to the length of the data byte array.

host - The address of the server.

Throws:

IOException - If an error occurs during the datagram send operation.

send

public void send(byte[] data,
                 InetAddress host)
          throws IOException

Same as send(data, data.length, host)

Overrides:

send in class DiscardUDPClient

Throws:

IOException

receive

public int receive(byte[] data,
                   int length)
            throws IOException

Receives echoed data and returns its length. The data may be divided up among multiple datagrams, requiring multiple calls to receive. Also, the UDP packets will not necessarily arrive in the same order they were sent.

Returns:

Length of actual data received.

Throws:

IOException - If an error occurs while receiving the data.

receive

public int receive(byte[] data)
            throws IOException

Same as receive(data, data.length)

Throws:

IOException