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

        ackBuf[6] = 0;
        ackBuf[7] = 0;
        ackBuf[8] = 0;
        ackBuf[9] = 0;
      }
      socket.send(new DatagramPacket(ackBuf, ackBuf.length, addr));
    }

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      buf[7] = (byte) (datagramStamp >>> 0);


      datagramStamp++;
      size++;
      if (serverInfo.handshaken) {
        socket.send(new DatagramPacket(buf, count, serverAddr));
      }
      count = 8;
    }

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      int boot = getBootTS();
      handshakeBuf[0] = (byte) (boot >>> 24);
      handshakeBuf[1] = (byte) (boot >>> 16);
      handshakeBuf[2] = (byte) (boot >>> 8);
      handshakeBuf[3] = (byte) (boot >>> 0);
      socket.send(new DatagramPacket(handshakeBuf, handshakeBuf.length, addr));
    }

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      for (InetAddress address : Collections.list(iface.getInetAddresses())) {
        if (!address.isSiteLocalAddress()) continue;
        // Java 1.5 doesn't support getting the subnet mask, so try the two most common.
        byte[] ip = address.getAddress();
        ip[3] = -1; // 255.255.255.0
        socket.send(new DatagramPacket(data, data.length, InetAddress.getByAddress(ip), udpPort));
        ip[2] = -1; // 255.255.0.0
        socket.send(new DatagramPacket(data, data.length, InetAddress.getByAddress(ip), udpPort));
      }
    }
    if (DEBUG) debug("kryonet", "Broadcasted host discovery on port: " + udpPort);
  }

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    DatagramSocket socket = null;
    try {
      socket = new DatagramSocket();
      broadcast(udpPort, socket);
      socket.setSoTimeout(timeoutMillis);
      DatagramPacket packet = new DatagramPacket(new byte[0], 0);
      try {
        socket.receive(packet);
      } catch (SocketTimeoutException ex) {
        if (INFO) info("kryonet", "Host discovery timed out.");
        return null;
      }
      if (INFO) info("kryonet", "Discovered server: " + packet.getAddress());
      return packet.getAddress();
    } catch (IOException ex) {
      if (ERROR) error("kryonet", "Host discovery failed.", ex);
      return null;
    } finally {
      if (socket != null) socket.close();

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    try {
      socket = new DatagramSocket();
      broadcast(udpPort, socket);
      socket.setSoTimeout(timeoutMillis);
      while (true) {
        DatagramPacket packet = new DatagramPacket(new byte[0], 0);
        try {
          socket.receive(packet);
        } catch (SocketTimeoutException ex) {
          if (INFO) info("kryonet", "Host discovery timed out.");
          return hosts;
        }
        if (INFO) info("kryonet", "Discovered server: " + packet.getAddress());
        hosts.add(packet.getAddress());
      }
    } catch (IOException ex) {
      if (ERROR) error("kryonet", "Host discovery failed.", ex);
      return hosts;
    } finally {

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         }
         else
            log.fine("The progress listener is null");


         if (udp && this.sockUDP!=null && this.sock!=null) {
            DatagramPacket dp = new DatagramPacket(msg, msg.length, this.sock.getInetAddress(), this.sock.getPort());
            //DatagramPacket dp = new DatagramPacket(msg, msg.length, sock.getInetAddress(), 32001);
            this.sockUDP.send(dp);
            if (log.isLoggable(Level.FINE)) log.fine("UDP datagram is send");
         }
         else {

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            }


            log.info("Started successfully " + getType() + " UDP driver on '" + socketUrl.getUrl() + "'");


            byte packetBuffer[] = new byte[MAX_PACKET_SIZE];
            DatagramPacket packet = new DatagramPacket(packetBuffer, packetBuffer.length);
            MsgInfo receiver = null;
            listenerReadyUDP = true;
            while (runningUDP) {
               try {
                  socketUDP.receive(packet);
               }
               catch (IOException e) {
                  if (e.toString().indexOf("closed") == -1) {
                     log.severe("Error receiving packet from '" + socketUrl.getUrl() + "' : " + e.toString());
                  }
                  else {
                     if (log.isLoggable(Level.FINE)) log.fine("UDP datagram socket shutdown '" + socketUrl.getUrl() + "' : " + e.toString());
                  }
                  return;
               }
               if (log.isLoggable(Level.FINE))
                  log.fine("UDP packet arrived, size=" + packet.getLength() + " bytes");
               if (!runningUDP) {
                  log.info("Closing server '" + socketUrl.getUrl() + "'");
                  return;
               }
               int actualSize = packet.getLength();
               if (packet.getLength() > MAX_PACKET_SIZE) {
                  log.warning("Packet has been truncated, size=" + packet.getLength() + ", MAX_PACKET_SIZE=" + MAX_PACKET_SIZE);
                  actualSize = MAX_PACKET_SIZE;
               }
               InputStream iStream = new ByteArrayInputStream(packet.getData(), 0, actualSize);
               try {
                  receiver = MsgInfo.parse(glob, null, iStream, null/*getMsgInfoParserClassName()*/, getPluginConfig())[0];
               }
               catch (Throwable e) {
                  log.severe("Error parsing data from UDP packet: " + e);

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        } catch( UnknownHostException uhe ) {
        }


        snd_buf = new byte[SND_BUF_SIZE];
        rcv_buf = new byte[RCV_BUF_SIZE];
        out = new DatagramPacket( snd_buf, SND_BUF_SIZE, baddr, NAME_SERVICE_UDP_PORT );
        in  = new DatagramPacket( rcv_buf, RCV_BUF_SIZE );


        if( RO == null || RO.length() == 0 ) {


            /* No resolveOrder has been specified, use the
             * default which is LMHOSTS,WINS,BCAST,DNS or just

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      this.port = port;
  }


  public int write(byte data[], int offset, int len) {
      try {
    sock.send(new DatagramPacket(data, offset, len, addr, port));
      } catch (Exception e) {
    return -1;
      }
      return len;
  }

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