Examples of java.net.MulticastSocket

java.net.MulticastSocket
a Multicast group and send the group salutations ... String msg = "Hello"; InetAddress group = InetAddress.getByName("228.5.6.7"); MulticastSocket s = new MulticastSocket(6789); s.joinGroup(group); DatagramPacket hi = new DatagramPacket(msg.getBytes(), msg.length(), group, 6789); s.send(hi); // get their responses! byte[] buf = new byte[1000]; DatagramPacket recv = new DatagramPacket(buf, buf.length); s.receive(recv); ... // OK, I'm done talking - leave the group... s.leaveGroup(group); When one sends a message to a multicast group, all subscribing recipients to that host and port receive the message (within the time-to-live range of the packet, see below). The socket needn't be a member of the multicast group to send messages to it.
When a socket subscribes to a multicast group/port, it receives datagrams sent by other hosts to the group/port, as do all other members of the group and port. A socket relinquishes membership in a group by the leaveGroup(InetAddress addr) method. Multiple MulticastSocket's may subscribe to a multicast group and port concurrently, and they will all receive group datagrams.
Currently applets are not allowed to use multicast sockets. @author Pavani Diwanji @since JDK1.1

        this.service = service;
        this.sendFrequency = sendFrequency;
    }
    
    protected void setupSocket() throws IOException {
        if (mcastBindAddress != null) socket = new MulticastSocket(new java.net.
            InetSocketAddress(mcastBindAddress, port));
        else socket = new MulticastSocket(port);
        if (mcastBindAddress != null) {
      if(log.isInfoEnabled())
                log.info("Setting multihome multicast interface to:" +
                         mcastBindAddress);
            socket.setInterface(mcastBindAddress);

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      if (started)
      {
         return;
      }


      socket = new MulticastSocket(groupPort);


      if (localBindAddress != null)
      {
         socket.setInterface(localBindAddress);
      }

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         // HORNETQ-874
         if (checkForLinux() || checkForSolaris() || checkForHp())
         {
            try
            {
               receivingSocket = new MulticastSocket(new InetSocketAddress(groupAddress, groupPort));
            }
            catch (IOException e)
            {
               HornetQClientLogger.LOGGER.ioDiscoveryError(groupAddress.getHostAddress(), groupAddress instanceof Inet4Address ? "IPv4" : "IPv6");


               receivingSocket = new MulticastSocket(groupPort);
            }
         }
         else
         {
            receivingSocket = new MulticastSocket(groupPort);
         }


         if (localAddress != null)
         {
            receivingSocket.setInterface(localAddress);

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        DatagramPacket send_packet, recv_packet;
        byte[] send_buf;
        byte[] recv_buf=new byte[2100];


        if(local) {
            MulticastSocket send_sock=new MulticastSocket(PORT);
            send_sock.setTrafficClass(8);
            MulticastSocket recv_sock=new MulticastSocket(PORT);
            recv_sock.joinGroup(GROUP);
            recv_packet=new DatagramPacket(recv_buf, 0, recv_buf.length);
            for(int i=0; i < 10; i++) {
                start=System.currentTimeMillis();
                send_buf=Util.objectToByteBuffer(start);
                send_packet=new DatagramPacket(send_buf, 0, send_buf.length, GROUP, PORT);
                send_sock.send(send_packet);
                recv_sock.receive(recv_packet);
                start=((Long)Util.objectFromByteBuffer(recv_buf, recv_packet.getOffset(), recv_packet.getLength())).longValue();
                System.out.println("took " + (System.currentTimeMillis() - start) + " ms");
                Util.sleep(1000);
            }
            return;
        }


        if(sender) {
            MulticastSocket send_sock=new MulticastSocket(PORT);
            send_sock.setTrafficClass(8);
            for(int i=0; i < 10; i++) {
                start=System.currentTimeMillis();
                send_buf=Util.objectToByteBuffer(start);
                send_packet=new DatagramPacket(send_buf, 0, send_buf.length, GROUP, PORT);
                send_sock.send(send_packet);
                Util.sleep(1000);
            }
        }
        else {
            MulticastSocket recv_sock=new MulticastSocket(PORT);
            recv_sock.joinGroup(GROUP);
            recv_packet=new DatagramPacket(recv_buf, 0, recv_buf.length);
            System.out.println("receiver started");
            for(;;) {
                recv_sock.receive(recv_packet);
                start=((Long)Util.objectFromByteBuffer(recv_buf, recv_packet.getOffset(), recv_packet.getLength())).longValue();
                System.out.println("took " + (System.currentTimeMillis() - start) + " ms");
            }
        }
    }

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            this.channel=channel;
            this.matrix=matrix;
            this.jg=jg;
            num_msgs=matrix.length;
            if(group_addr != null) {
                sock=new MulticastSocket(group_port);
                sock.joinGroup(group_addr);
            }
        }

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            bind_addr=InetAddress.getLocalHost();


        ucast_sock=new DatagramSocket(0, bind_addr);
        ucast_sock.setReceiveBufferSize(max_receiver_buffer_size);
        ucast_sock.setSendBufferSize(max_send_buffer_size);
        mcast_sock=new MulticastSocket(mcast_port);
        mcast_sock.setReceiveBufferSize(max_receiver_buffer_size);
        mcast_sock.setSendBufferSize(max_send_buffer_size);
        if(bind_addr != null)
            mcast_sock.setInterface(bind_addr);
        mcast_sock.joinGroup(mcast_addr);

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      {
         // use this to bind so multicast will work w/o network
         this.bindAddr = localHost;
      }
      SocketAddress saddr = new InetSocketAddress(bindAddr, port);
      socket = new MulticastSocket(saddr);
      socket.joinGroup(addr);


      super.start();


      if(listener == null)

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      {
         return;
      }


      try {
         socket = new MulticastSocket(groupPort);


         if (localBindAddress != null)
         {
            socket.setInterface(localBindAddress);
         }

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         // HORNETQ-874
         if (checkForLinux() || checkForSolaris() || checkForHp())
         {
            try
            {
               receivingSocket = new MulticastSocket(new InetSocketAddress(groupAddress, groupPort));
            }
            catch (IOException e)
            {
               HornetQClientLogger.LOGGER.ioDiscoveryError(groupAddress.getHostAddress(), groupAddress instanceof Inet4Address ? "IPv4" : "IPv6");


               receivingSocket = new MulticastSocket(groupPort);
            }
         }
         else
         {
            receivingSocket = new MulticastSocket(groupPort);
         }


         if (localAddress != null)
         {
            receivingSocket.setInterface(localAddress);

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        DatagramPacket packet;
        byte buf[]=null;
        byte[] recv_buf;


        Receiver(InetAddress mcast_addr, InetAddress bind_interface, int port) throws Exception {
            sock=new MulticastSocket(port);
            if(bind_interface != null)
                sock.setInterface(bind_interface);
            sock.joinGroup(mcast_addr);
            System.out.println("Socket=" + sock.getLocalAddress() + ':' + sock.getLocalPort() + ", bind interface=" +
                    sock.getInterface());

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