001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018 package org.apache.commons.net.discard; 019 020 import java.io.IOException; 021 import java.net.DatagramPacket; 022 import java.net.InetAddress; 023 024 import org.apache.commons.net.DatagramSocketClient; 025 026 /*** 027 * The DiscardUDPClient class is a UDP implementation of a client for the 028 * Discard protocol described in RFC 863. To use the class, 029 * just open a local UDP port 030 * with {@link org.apache.commons.net.DatagramSocketClient#open open } 031 * and call {@link #send send } to send datagrams to the server 032 * After you're done sending discard data, call 033 * {@link org.apache.commons.net.DatagramSocketClient#close close() } 034 * to clean up properly. 035 * <p> 036 * <p> 037 * @see DiscardTCPClient 038 ***/ 039 040 public class DiscardUDPClient extends DatagramSocketClient 041 { 042 /*** The default discard port. It is set to 9 according to RFC 863. ***/ 043 public static final int DEFAULT_PORT = 9; 044 045 DatagramPacket _sendPacket; 046 047 public DiscardUDPClient() 048 { 049 _sendPacket = new DatagramPacket(new byte[0], 0); 050 } 051 052 053 /*** 054 * Sends the specified data to the specified server at the specified port. 055 * <p> 056 * @param data The discard data to send. 057 * @param length The length of the data to send. Should be less than 058 * or equal to the length of the data byte array. 059 * @param host The address of the server. 060 * @param port The service port. 061 * @exception IOException If an error occurs during the datagram send 062 * operation. 063 ***/ 064 public void send(byte[] data, int length, InetAddress host, int port) 065 throws IOException 066 { 067 _sendPacket.setData(data); 068 _sendPacket.setLength(length); 069 _sendPacket.setAddress(host); 070 _sendPacket.setPort(port); 071 _socket_.send(_sendPacket); 072 } 073 074 075 /*** 076 * Same as 077 * <code>send(data, length, host. DiscardUDPClient.DEFAULT_PORT)</code>. 078 ***/ 079 public void send(byte[] data, int length, InetAddress host) 080 throws IOException 081 { 082 send(data, length, host, DEFAULT_PORT); 083 } 084 085 086 /*** 087 * Same as 088 * <code>send(data, data.length, host. DiscardUDPClient.DEFAULT_PORT)</code>. 089 ***/ 090 public void send(byte[] data, InetAddress host) throws IOException 091 { 092 send(data, data.length, host, DEFAULT_PORT); 093 } 094 095 } 096