Examples of java.net.DatagramSocket

java.net.DatagramSocket
This class represents a socket for sending and receiving datagram packets.
A datagram socket is the sending or receiving point for a packet delivery service. Each packet sent or received on a datagram socket is individually addressed and routed. Multiple packets sent from one machine to another may be routed differently, and may arrive in any order.
UDP broadcasts sends are always enabled on a DatagramSocket. In order to receive broadcast packets a DatagramSocket should be bound to the wildcard address. In some implementations, broadcast packets may also be received when a DatagramSocket is bound to a more specific address.
Example: DatagramSocket s = new DatagramSocket(null); s.bind(new InetSocketAddress(8888)); Which is equivalent to: DatagramSocket s = new DatagramSocket(8888); Both cases will create a DatagramSocket able to receive broadcasts on UDP port 8888. @author Pavani Diwanji @version 1.101, 06/08/06 @see java.net.DatagramPacket @see java.nio.channels.DatagramChannel @since JDK1.0

    if (port < 1024 || port > 65535) {
      throw new IllegalArgumentException("Port Number Out of Bound: " + port);
    }


    ServerSocket ss = null;
    DatagramSocket ds = null;


    try {
      ss = new ServerSocket(port);
      ss.setReuseAddress(true);


      ds = new DatagramSocket(port);
      ds.setReuseAddress(true);


      return true;


    } catch (IOException e) {
      return false;
    } finally {
      if (ss != null) {
        ss.close();
      }


      if (ds != null) {
        ds.close();
      }
    }
  }

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        receiveByChannel(CAPACITY_NORMAL, localAddr2,
                "some normal string in testReceiveSend_Normal_S2C");
    }


    public void testReceiveSend_Block_Normal_C2S() throws Exception {
        this.datagramSocket1 = new DatagramSocket(localAddr2.getPort());
        String str1 = "some normal string in testReceiveSend_Normal_C2S";
        sendByChannel(str1, localAddr2);
        receiveByDatagramSocket(CAPACITY_NORMAL, localAddr2, str1);
    }

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    }


    public void testReceiveSend_NonBlock_Normal_C2S() throws Exception {
        this.channel1.configureBlocking(false);
        this.channel2.configureBlocking(false);
        this.datagramSocket1 = new DatagramSocket(localAddr2.getPort());
        String str1 = "some normal string in testReceiveSend_Normal_C2S";
        sendByChannel(str1, localAddr2);
        receiveByDatagramSocket(CAPACITY_NORMAL, localAddr2, str1);
    }

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        receiveByDatagramSocket(CAPACITY_NORMAL, localAddr2, str1);
    }


    public void testReceiveSend_Normal_S2S() throws Exception {
        String msg = "normal string in testReceiveSend_Normal_S2S";
        this.datagramSocket1 = new DatagramSocket(testPort);
        DatagramPacket rdp = new DatagramPacket(msg.getBytes(), msg.length(),
                localAddr2);
        datagramSocket2 = new DatagramSocket(localAddr2.getPort());
        this.datagramSocket1.send(rdp);
        byte[] buf = new byte[CAPACITY_NORMAL];
        this.datagramSocket2.setSoTimeout(TIME_UNIT);
        rdp = new DatagramPacket(buf, buf.length);
        this.datagramSocket2.receive(rdp);

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        sendByDatagramSocket("", localAddr2);
        receiveByChannel(CAPACITY_NORMAL, localAddr2, "");
    }


    public void testReceiveSend_Block_Empty_C2S() throws Exception {
        this.datagramSocket1 = new DatagramSocket(localAddr2.getPort());
        sendByChannel("", localAddr2);
        receiveByDatagramSocket(CAPACITY_NORMAL, localAddr2, "");
    }

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    }


    public void testReceiveSend_NonBlock_Empty_C2S() throws Exception {
        this.channel1.configureBlocking(false);
        this.channel2.configureBlocking(false);
        this.datagramSocket1 = new DatagramSocket(localAddr2.getPort());
        sendByChannel("", localAddr2);
        receiveByDatagramSocket(CAPACITY_NORMAL, localAddr2, "");
    }

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        receiveByDatagramSocket(CAPACITY_NORMAL, localAddr2, "");
    }


    public void testReceiveSend_Empty_S2S() throws Exception {
        String msg = "";
        this.datagramSocket1 = new DatagramSocket(testPort);
        DatagramPacket rdp = new DatagramPacket(msg.getBytes(), msg.length(),
                localAddr2);
        datagramSocket2 = new DatagramSocket(localAddr2.getPort());
        this.datagramSocket1.send(rdp);
        byte[] buf = new byte[CAPACITY_NORMAL];
        this.datagramSocket2.setSoTimeout(TIME_UNIT);
        rdp = new DatagramPacket(buf, buf.length);
        this.datagramSocket2.receive(rdp);

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        sendByChannel("0123456789", localAddr2);
        receiveByChannel(5, localAddr2, "01234");
    }


    public void testReceiveSend_Block_Oversize_C2S() throws Exception {
        this.datagramSocket1 = new DatagramSocket(localAddr2.getPort());
        sendByChannel("0123456789", localAddr2);
        receiveByDatagramSocket(5, localAddr2, "01234");
    }

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    }


    public void testReceiveSend_NonBlock_Oversize_C2S() throws Exception {
        this.channel1.configureBlocking(false);
        this.channel2.configureBlocking(false);
        this.datagramSocket1 = new DatagramSocket(localAddr2.getPort());
        sendByChannel("0123456789", localAddr2);
        receiveByDatagramSocket(5, localAddr2, "01234");
    }

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        }
    }


    private void sendByDatagramSocket(String data, InetSocketAddress address)
            throws Exception {
        this.datagramSocket1 = new DatagramSocket(testPort);
        DatagramPacket rdp = new DatagramPacket(data.getBytes(), data.length(),
                address);
        this.datagramSocket1.send(rdp);
    }

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