org.apache.commons.net.echo

Class 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.

See Also:
EchoTCPClient, DiscardUDPClient

Field Summary

static int
DEFAULT_PORT
The default echo port.

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.
@Override
void send(byte[] data, InetAddress host)
Same as send(data, data.length, host) **
@Override
void send(byte[] data, int length, InetAddress host)
Sends the specified data to the specified server at the default echo port.

Field Details

DEFAULT_PORT

public static final int DEFAULT_PORT
The default echo port. It is set to 7 according to RFC 862. **
Field Value:
7

Method Details

receive

public int receive(byte[] data)
            throws IOException
Same as receive(data, data.length) **

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.

void send

public @Override void send(byte[] data,
                           InetAddress host)
            throws IOException
Same as send(data, data.length, host) **

void send

public @Override void send(byte[] data,
                           int length,
                           InetAddress host)
            throws IOException
Sends the specified data to the specified server at the default echo port.

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.