1 /* 2 * Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * - Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 11 * - Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * - Neither the name of Oracle nor the names of its 16 * contributors may be used to endorse or promote products derived 17 * from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * This source code is provided to illustrate the usage of a given feature 34 * or technique and has been deliberately simplified. Additional steps 35 * required for a production-quality application, such as security checks, 36 * input validation and proper error handling, might not be present in 37 * this sample code. 38 */ 39 40 41 import java.nio.channels.*; 42 import java.nio.charset.Charset; 43 import java.net.*; 44 import java.io.IOException; 45 import java.util.*; 46 47 /** 48 * Sample multicast sender to send a message in a multicast datagram 49 * to a given group. 50 */ 51 52 public class Sender { 53 usage()54 private static void usage() { 55 System.err.println("usage: java Sender group:port[@interface] message"); 56 System.exit(-1); 57 } 58 main(String[] args)59 public static void main(String[] args) throws IOException { 60 if (args.length < 2) 61 usage(); 62 63 MulticastAddress target = MulticastAddress.parse(args[0]); 64 65 // create socket 66 ProtocolFamily family = StandardProtocolFamily.INET; 67 if (target.group() instanceof Inet6Address) 68 family = StandardProtocolFamily.INET6; 69 DatagramChannel dc = DatagramChannel.open(family).bind(new InetSocketAddress(0)); 70 if (target.interf() != null) { 71 dc.setOption(StandardSocketOptions.IP_MULTICAST_IF, target.interf()); 72 } 73 74 // send multicast packet 75 dc.send(Charset.defaultCharset().encode(args[1]), 76 new InetSocketAddress(target.group(), target.port())); 77 dc.close(); 78 } 79 80 } 81