Examples of java.net.DatagramSocket.connect()

java.net.DatagramSocket.connect()
Connects the socket to a remote address for this socket. When a socket is connected to a remote address, packets may only be sent to or received from that address. By default a datagram socket is not connected.
If the remote destination to which the socket is connected does not exist, or is otherwise unreachable, and if an ICMP destination unreachable packet has been received for that address, then a subsequent call to send or receive may throw a PortUnreachableException. Note, there is no guarantee that the exception will be thrown.
A caller's permission to send and receive datagrams to a given host and port are checked at connect time. When a socket is connected, receive and send will not perform any security checks on incoming and outgoing packets, other than matching the packet's and the socket's address and port. On a send operation, if the packet's address is set and the packet's address and the socket's address do not match, an IllegalArgumentException will be thrown. A socket connected to a multicast address may only be used to send packets. @param address the remote address for the socket @param port the remote port for the socket. @exception IllegalArgumentException if the address is null,or the port is out of range. @exception SecurityException if the caller is not allowed tosend datagrams to and receive datagrams from the address and port. @see #disconnect @see #send @see #receive


      if (_port == 0)
        throw (new Exception("Job Scheduler port missing."));


      udpSocket = new DatagramSocket();
      udpSocket.connect(InetAddress.getByName(_host), _port);


      // protocol=udp
      if (msg.indexOf("<?xml") == -1) {
        msg = "<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>" + msg + "\r\n";
      }

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          int intPortNumber = 0;
          try {
            udpSocket = new DatagramSocket();
            intPortNumber = objOptions.PortNumber.value();
            InetAddress objInetAddress = objOptions.ServerName.getInetAddress();
            udpSocket.connect(objInetAddress, intPortNumber);
            if (strT.indexOf("<?xml") == -1) {
              strT = "<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>" + strT;
            }
            byte[] btyBuffer = strT.getBytes();
            udpSocket.send(new DatagramPacket(btyBuffer, btyBuffer.length, objInetAddress, intPortNumber));

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      }


      // This does not transfer any data
      // The ip is a.root-servers.net, 53 is DNS
      try {
        ds.connect(InetAddress.getByName("198.41.0.4"), 53);
      } catch (UnknownHostException ex) {
        Logger.error(this, "UnknownHostException", ex);
        return null;
      }
      return ds.getLocalAddress();

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    } else {
      // This is a UDP transport...
      DatagramSocket datagramSock = sipStack.getNetworkLayer()
          .createDatagramSocket();
      datagramSock.connect(receiverAddress, contactPort);
      DatagramPacket dgPacket = new DatagramPacket(bytes, 0, length,
          receiverAddress, contactPort);
      datagramSock.send(dgPacket);
      datagramSock.close();
      return null;

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    } else {
      // This is a UDP transport...
      DatagramSocket datagramSock = sipStack.getNetworkLayer()
          .createDatagramSocket();
      datagramSock.connect(receiverAddress, contactPort);
      DatagramPacket dgPacket = new DatagramPacket(bytes, 0, length,
          receiverAddress, contactPort);
      datagramSock.send(dgPacket);
      datagramSock.close();
      return null;

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        } else {
            // This is a UDP transport...
            DatagramSocket datagramSock = sipStack.getNetworkLayer()
                    .createDatagramSocket();
            datagramSock.connect(receiverAddress, contactPort);
            DatagramPacket dgPacket = new DatagramPacket(bytes, 0, length,
                    receiverAddress, contactPort);
            datagramSock.send(dgPacket);
            datagramSock.close();
            return null;

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    } else {
      // This is a UDP transport...
      DatagramSocket datagramSock = sipStack.getNetworkLayer()
          .createDatagramSocket();
      datagramSock.connect(receiverAddress, contactPort);
      DatagramPacket dgPacket = new DatagramPacket(bytes, 0, length,
          receiverAddress, contactPort);
      datagramSock.send(dgPacket);
      datagramSock.close();
      return null;

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      } catch (Exception e) {
        fail(
            "Failed to set up datagram server for bin datagram socket test ");
      }


      ds.connect(new InetSocketAddress(localHost, serverPortNumber));


      byte[] sendBytes = { 'T', 'e', 's', 't', 0 };
      DatagramPacket send = new DatagramPacket(sendBytes,
          sendBytes.length);
      ds.send(send);

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          theSocket.isBound());
      theSocket.close();


      // connect causes implicit bind
      theSocket = new DatagramSocket(null);
      theSocket.connect(new InetSocketAddress(addr, port));
      assertTrue("Socket indicated not bound when it should be (3)",
          theSocket.isBound());
      theSocket.close();


      // now test when we bind explicitely

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      // base test
      DatagramSocket theSocket = new DatagramSocket(ports[1]);
      assertFalse("Socket indicated connected when it should not be",
          theSocket.isConnected());
      theSocket.connect(new InetSocketAddress(addr, port));
      assertTrue("Socket indicated  not connected when it should be",
          theSocket.isConnected());


      // reconnect the socket and make sure we get the right answer
      theSocket.connect(new InetSocketAddress(addr, ports[2]));

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