Examples of java.net.DatagramSocket.send()

java.net.DatagramSocket.send()
Sends a datagram packet from this socket. The DatagramPacket includes information indicating the data to be sent, its length, the IP address of the remote host, and the port number on the remote host.
If there is a security manager, and the socket is not currently connected to a remote address, this method first performs some security checks. First, if p.getAddress().isMulticastAddress() is true, this method calls the security manager's checkMulticast method with p.getAddress() as its argument. If the evaluation of that expression is false, this method instead calls the security manager's checkConnect method with arguments p.getAddress().getHostAddress() and p.getPort(). Each call to a security manager method could result in a SecurityException if the operation is not allowed. @param p the DatagramPacket to be sent. @exception IOException if an I/O error occurs. @exception SecurityException if a security manager exists and its checkMulticast or checkConnect method doesn't allow the send. @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 SecurityManager#checkMulticast(InetAddress) @see SecurityManager#checkConnect @revised 1.4 @spec JSR-51

        dataOut.writeFloat(2.0f);
        byte[] bytesToSend = bytesOut.toByteArray();


        DatagramPacket outboundPacket = new DatagramPacket(bytesToSend, bytesToSend.length,
            InetAddress.getLocalHost(), outPort);
        socket.send(outboundPacket);


        // receive whatever came back
        byte[] receiveBuffer = new byte[bytesToSend.length];
        DatagramPacket inboundPacket = new DatagramPacket(receiveBuffer, receiveBuffer.length);
        socket.receive(inboundPacket);

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            // We send an empty datagram packet to fix bug 4293791 (it's a jdk 1.1 bug)
            //
            DatagramSocket sn = new java.net.DatagramSocket(0);
            byte[] ob = new byte[1];
            DatagramPacket pk = new DatagramPacket(ob , 1, java.net.InetAddress.getLocalHost(), _socketPort);
            sn.send(pk);
            sn.close();
        } catch (Exception e) {}


        // First close the datagram socket.
        // This may generates an IO exception at the run method (_socket.receive).

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      // Set the transmit timestamp *just* before sending the packet
      // ToDo: Does this actually improve performance or not?
      NtpMessage.encodeTimestamp(packet.getData(), 40,
        (System.currentTimeMillis()/1000.0) + 2208988800.0);


      socket.send(packet);




      // Get response
      mLog.info("NTP request sent, waiting for response...");
      packet = new DatagramPacket(buf, buf.length);

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        byte[] searchMessageBytes = searchMessage.getBytes();
              DatagramPacket ssdpDiscoverPacket = new DatagramPacket(searchMessageBytes, searchMessageBytes.length);
              ssdpDiscoverPacket.setAddress(InetAddress.getByName(IP));
              ssdpDiscoverPacket.setPort(PORT);
  
              ssdp.send(ssdpDiscoverPacket);
              ssdp.setSoTimeout(TIMEOUT);
  
              
              boolean waitingPacket = true;
              while (waitingPacket) {

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    DatagramSocket socket = null; 
    try {
      socket = new DatagramSocket();
      InetAddress receiver =  InetAddress.getByName(t.ip); 
      DatagramPacket packet = new DatagramPacket(message, message.length, receiver, t.port);
      socket.send(packet);  
    } catch (IOException e) {              
      e.printStackTrace();
    }finally{
      socket.close();
    }

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                DatagramSocket ds0 = new DatagramSocket(14004, InetAddress.getByName("0.0.0.0"));
                DatagramSocket ds1 = new DatagramSocket(14050, InetAddress.getByName("0.0.0.0"));
                DatagramPacket echo0 = new DatagramPacket(packet, packet.length, InetAddress.getLocalHost(), response.getPortA());
                DatagramPacket echo1 = new DatagramPacket(packet, packet.length, InetAddress.getLocalHost(), response.getPortB());


                ds1.send(echo1);
                ds0.send(echo0);


                Thread.sleep(500);


                Thread t0 = new Thread(new Listener(ds0));

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                int repeat = 300;


                for (int i = 0; i < repeat; i++) {
                    ds0.send(echo0);
                    ds1.send(echo1);
                    Thread.sleep(200);
                }


                System.out.println(valCounter());
                assertTrue(valCounter() == repeat * 2 + 1);

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        DatagramPacket wp = new DatagramPacket(writeBuf, writeBuf.length);
        DatagramPacket rp = new DatagramPacket(readBuf, readBuf.length);


        for (int i = 0; i < 10; i++) {
            fillWriteBuffer(writeBuf, i);
            client.send(wp);


            client.receive(rp);
            assertEquals(writeBuf.length, rp.getLength());
            assertEquals(writeBuf, readBuf);
        }

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        // must append delimiter
        byte[] data = (input + "\n").getBytes();


        DatagramPacket packet = new DatagramPacket(data, data.length, address, PORT);
        LOG.debug("+++ Sending data +++");
        socket.send(packet);


        Thread.sleep(1000);


        byte[] buf = new byte[128];
        DatagramPacket receive = new DatagramPacket(buf, buf.length, address, PORT);

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        DatagramSocket ds = new DatagramSocket(0);
        DatagramPacket dp = new DatagramPacket("Test String".getBytes(), 11,
                InetAddress.getLocalHost(), 0);
        ds.close();
        try {
            ds.send(dp);
            fail("Data sent after close");
        } catch (IOException e) {
            // Expected
        }
    }

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