Examples of java.net.DatagramPacket

java.net.DatagramPacket
This class represents a datagram packet.
Datagram packets are used to implement a connectionless packet delivery service. Each message is routed from one machine to another based solely on information contained within that packet. Multiple packets sent from one machine to another might be routed differently, and might arrive in any order. Packet delivery is not guaranteed. @author Pavani Diwanji @author Benjamin Renaud @version 1.46, 04/07/06 @since JDK1.0

      this.addr = addr;
      this.port = port;
  }


  public int read(byte buffer[], int offset, int length) {
      DatagramPacket p = new DatagramPacket(buffer, offset, length, addr, port);
      try {
    sock.receive(p);
      } catch (IOException e) {
    return -1;
      }
      synchronized (this) {
    dataRead = true;
    notify();
      }
      return p.getLength();
  }

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        for (int i = 0; i < remoteAddrs.size(); ++i) {
            InetAddress remoteAddr = remoteAddrs.elementAt(i);
            int remotePort = (remotePorts.elementAt(i)).intValue();


            try {
                socket.send(new DatagramPacket(buffer, offset, length, remoteAddr, remotePort));
            } catch (Exception e) {
                // TODO error handling
                return -1;
            }
        }

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     */
    public int writeToRemote(byte[] buffer, int offset, int length,
            InetAddress remoteAddr, int remotePort) {


        try {
            socket.send(new DatagramPacket(buffer, offset, length, remoteAddr,
                    remotePort));
        } catch (Exception e) {
            // TODO error handling
            return -1;
        }

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      if (o instanceof DatagramPacket)


      {


        final DatagramPacket packet = (DatagramPacket) o;


        if (length < packet.getLength())


          throw new IllegalArgumentException("Length must be at least " + packet.getLength());


        System.arraycopy(packet.getData(), packet.getOffset(), buffer, offset, packet.getLength());


        logger.finer("packet length: " + packet.getLength());


        return packet.getLength();


      }


      else if (o instanceof IOException)

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          // TODO: avoid memory allocatioin for each packet:


          final byte[] data = new byte[getMinimumTransferSize()];


          final DatagramPacket packet = new DatagramPacket(data, data.length);


              try


        {

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                try {


                    if (buffersUsed < buffer.length) {


                        DatagramPacket packet = 


                            new DatagramPacket(buffer[currentReceive],


                                    0, buffer[currentReceive].length);


                        socket.receive(packet);


                        bufferSize[currentReceive] = packet.getLength();


                        currentReceive = (currentReceive + 1) % buffer.length;


                        buffersUsed++;

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               if (trace)
               {
                  this.log.trace("HA-JNDI AutomaticDiscovery waiting for queries...");
               }
               byte[] buf = new byte[256];
               DatagramPacket packet = new DatagramPacket(buf, buf.length);
               this.socket.receive(packet);
               if (trace)
               {
                  this.log.trace("HA-JNDI AutomaticDiscovery Packet received.");
               }

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                     this.log.trace("DiscoveryRequestHandler end");
                  }
                  return;
               }
            }
            DatagramPacket p = new DatagramPacket(this.ipAddress, this.ipAddress.length,
               this.packet.getAddress(), this.packet.getPort());
            if (trace)
            {
               this.log.trace("Sending AutomaticDiscovery answer: " + new String(this.ipAddress) +
                         " to " + this.packet.getAddress() + ":" + this.packet.getPort());

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   private void test() throws Exception
   {
      try
      {
         byte[] data = "Hello".getBytes();
         DatagramPacket datagram = new DatagramPacket(data, 0, data.length, goodMulticast, mcastPort);
         
         System.out.println("Sending 'Hello' on " + goodMulticast + ":" + mcastPort);
         sender.send(datagram);
         
         Thread.sleep(1000);

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         try
         {
            System.out.println("Listening on address " + group);
            
            byte[] buf = new byte[256];
            DatagramPacket packet = new DatagramPacket(buf, buf.length);
            socket.receive(packet);
            
            value = new String(packet.getData()).trim();
            
            System.out.println(group + ":" + mcastPort + " -- Received " + value);
         }
         catch (Exception e)
         {

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