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

                    }


                    try {
                        s.send(requestPacket);
                        responsePacket.setLength(responseBytes.length);
                        s.receive(responsePacket);
                        if (responsePacket.getLength() != responseBytes.length) {
                            LOG.error("Got a short response: "
                                    + responsePacket.getLength());
                            continue;
                        }

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                    }


                    try {
                        s.send(requestPacket);
                        responsePacket.setLength(responseBytes.length);
                        s.receive(responsePacket);
                        if (responsePacket.getLength() != responseBytes.length) {
                            LOG.error("Got a short response: "
                                    + responsePacket.getLength());
                            continue;
                        }

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        while (true) {
          try (DatagramSocket ss = new DatagramSocket(port)) {
            byte[] receiveData = new byte[BUFFER_SIZE];
            while (true) {
              DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
              ss.receive(receivePacket);
              final byte[] b = new byte[receivePacket.getLength()];
              System.arraycopy(receivePacket.getData(), receivePacket.getOffset(), b, 0, b.length);
              final InetAddress sourceAddress = receivePacket.getAddress();
              final int sourcePort = receivePacket.getPort();
              LOGGER.trace("Packet received: " + b.length + " bytes from: " + sourceAddress + ":" + sourcePort);

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        Thread.sleep(1000);


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


        socket.close();


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

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      byte[] b = new byte[8192];
      DatagramPacket info = new DatagramPacket(b, b.length);


      try {
        s.receive(info);
        received.countDown();
      } catch (IOException e) {
        LOG.warn(e);
        return;
      }

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      System.setProperty("activity.port", String.valueOf(socket.getLocalPort()));
      DatagramLoggingActivityFactory fac = new DatagramLoggingActivityFactory();
      Activity a = fac.createActivity();
      Incident i = new Incident();
      a.log(i);
      socket.receive(packet);
      ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(packet.getData(), packet.getOffset(),
        packet.getLength()));
      Incident j = (Incident) ois.readObject();
      assertEquals(i, j);
    } finally {

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        Thread.sleep(1000);


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


        socket.close();


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

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        Thread.sleep(1000);


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


        socket.close();


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

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        socket.setSoTimeout(3000);
        DatagramPacket packet = new DatagramPacket(new byte[] { 1, 2, 3, 4, 5,
                6 }, 6, localhost, port);
        socket.send(packet);
        socket.receive(packet);
        socket.close();
        assertTrue("datagram received wrong port: " + packet.getPort(), packet
                .getPort() == port);
    }

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

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