1 /*

     2  * Copyright 2007-2008 Sun Microsystems, Inc.  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 Sun Microsystems 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 import java.nio.channels.*;

    33 import java.nio.charset.Charset;

    34 import java.net.*;

    35 import java.io.IOException;

    36 import java.util.*;

    37 

    38 /**

    39  * Sample multicast sender to send a message in a multicast datagram

    40  * to a given group.

    41  */

    42 

    43 public class Sender {

    44 

    45     private static void usage() {

    46         System.err.println("usage: java Sender group:port[@interface] message");

    47         System.exit(-1);

    48     }

    49 

    50     public static void main(String[] args) throws IOException {

    51         if (args.length < 2)

    52             usage();

    53 

    54         MulticastAddress target = MulticastAddress.parse(args[0]);

    55 

    56         // create socket

    57         ProtocolFamily family = StandardProtocolFamily.INET;

    58         if (target.group() instanceof Inet6Address)

    59             family = StandardProtocolFamily.INET6;

    60         DatagramChannel dc = DatagramChannel.open(family).bind(new InetSocketAddress(0));

    61         if (target.interf() != null) {

    62             dc.setOption(StandardSocketOption.IP_MULTICAST_IF, target.interf());

    63         }

    64 

    65         // send multicast packet

    66         dc.send(Charset.defaultCharset().encode(args[1]),

    67                 new InetSocketAddress(target.group(), target.port()));

    68         dc.close();

    69     }

    70 

    71 }