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What this is

This file is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

 * Copyright 2001-2004 The Apache Software Foundation
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

 * 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 EchoTCPClient * @see DiscardUDPClient ***/ public final class EchoUDPClient extends DiscardUDPClient { /*** The default echo port. It is set to 7 according to RFC 862. ***/ public static final int DEFAULT_PORT = 7; private DatagramPacket __receivePacket = new DatagramPacket(new byte[0], 0); /*** * Sends the specified data to the specified server at the default echo * port. *

* @param data The echo data to send. * @param length The length of the data to send. Should be less than * or equal to the length of the data byte array. * @param host The address of the server. * @exception IOException If an error occurs during the datagram send * operation. ***/ public void send(byte[] data, int length, InetAddress host) throws IOException { send(data, length, host, DEFAULT_PORT); } /*** Same as send(data, data.length, host) ***/ public void send(byte[] data, InetAddress host) throws IOException { send(data, data.length, host, DEFAULT_PORT); } /*** * 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. *

* @return Length of actual data received. * @exception IOException If an error occurs while receiving the data. ***/ public int receive(byte[] data, int length) throws IOException { __receivePacket.setData(data); __receivePacket.setLength(length); _socket_.receive(__receivePacket); return __receivePacket.getLength(); } /*** Same as receive(data, data.length) ***/ public int receive(byte[] data) throws IOException { return receive(data, data.length); } }

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