Examples of java.net.DatagramSocket.receive()

java.net.DatagramSocket.receive()
Receives a datagram packet from this socket. When this method returns, the DatagramPacket's buffer is filled with the data received. The datagram packet also contains the sender's IP address, and the port number on the sender's machine.
This method blocks until a datagram is received. The length field of the datagram packet object contains the length of the received message. If the message is longer than the packet's length, the message is truncated.
If there is a security manager, a packet cannot be received if the security manager's checkAccept method does not allow it. @param p the DatagramPacket into which to placethe incoming data. @exception IOException if an I/O error occurs. @exception SocketTimeoutException if setSoTimeout was previously calledand the timeout has expired. @exception PortUnreachableException may be thrown if the socket is connectedto a currently unreachable destination. Note, there is no guarantee that the exception will be thrown. @exception java.nio.channels.IllegalBlockingModeException if this socket has an associated channel, and the channel is in non-blocking mode. @see java.net.DatagramPacket @see java.net.DatagramSocket @revised 1.4 @spec JSR-51

            fail("should throw IllegalBlockingModeException");
        } catch (IllegalBlockingModeException e) {
            // expected
        }
        try {
            socket.receive(null);
            fail("should throw IllegalBlockingModeException");
        } catch (IllegalBlockingModeException e) {
            // expected
        }
    }

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                    try {
                        serverSocket = new DatagramSocket(notificationPort);
                        while (true) {
                            byte[] buf = new byte[256];
                            DatagramPacket packet = new DatagramPacket(buf, buf.length);
                            serverSocket.receive(packet);
                            BufferedReader reader = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(buf)));
                            parseNotification(reader);
                        }
                    } catch (IOException e) {
                        logger.log(Level.SEVERE, "Error while listening to socket", e);

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  while(true){    // tant que c'est OK
    try {
  
        DatagramSocket socket = new DatagramSocket(1234) ;//écoute sur le port 1234
      
        socket.receive(inPacket) ;      //reçoit la socket
    
      
        byte[] result = inPacket.getData() ;     //stocke les données reçues dans le tableau byte
        //System.out.println(new String(result,0,result.length)) ;
        byte type =  result[0] ;      //récupère le type au 1er indice du tableau

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        Thread.sleep(1000);


        byte[] buf = new byte[128];
        DatagramPacket receive = new DatagramPacket(buf, buf.length, address, PORT);
        LOG.debug("Receving data");
        socket.receive(receive);


        socket.close();


        return new String(receive.getData(), 0, receive.getLength());
    }

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      final DatagramSocket ds = new DatagramSocket();
      ds.setSoTimeout(12000);
      Runnable runnable = new Runnable() {
        public void run() {
          try {
            ds.receive(new DatagramPacket(new byte[1], 1));
          } catch (InterruptedIOException e) {
            interrupted = true;
          } catch (IOException e) {
          }
        }

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      interrupted = false;
      DatagramSocket ds3 = new DatagramSocket();
      ds3.setSoTimeout(500);
      Date start = new Date();
      try {
        ds3.receive(new DatagramPacket(new byte[1], 1));
      } catch (InterruptedIOException e) {
        interrupted = true;
      }
      ds3.close();
      assertTrue("receive not interrupted", interrupted);

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      DatagramPacket send = new DatagramPacket(new byte[10], 10,
          localHost, port);
      ds.send(send);
      DatagramPacket receive = new DatagramPacket(new byte[20], 20);
      ds.setSoTimeout(2000);
      ds.receive(receive);
      ds.close();
      assertTrue("Wrong size: " + receive.getLength(), receive
          .getLength() == 10);
      assertTrue("Wrong receiver", receive.getAddress().equals(localHost));
    } catch (IOException e) {

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      ds.connect(inetAddress, portNumber);
      DatagramPacket send = new DatagramPacket(new byte[10], 10);
      ds.send(send);
      DatagramPacket receive = new DatagramPacket(new byte[20], 20);
      ds.setSoTimeout(10000);
      ds.receive(receive);
      ds.close();
      fail(
          "No PortUnreachableException when connected at native level on recv ");
    } catch (Exception e) {
      assertTrue(

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            lock.notifyAll();
          }
          socket.setSoTimeout(3000);
          DatagramPacket packet = new DatagramPacket(new byte[256],
              256);
          socket.receive(packet);
          socket.send(packet);
          socket.close();
        } catch (IOException e) {
          System.out.println("thread exception: " + e);
          if (socket != null)

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        } catch (InterruptedException e) {
          fail(e.toString());
        }
      }
      socket.send(packet);
      socket.receive(packet);
      socket.close();
      assertTrue("datagram received wrong port: " + packet.getPort(),
          packet.getPort() == port);
    } catch (IOException e) {
      if (socket != null)

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