Example usage for java.net DatagramSocket DatagramSocket

Introduction

In this page you can find the example usage for java.net DatagramSocket DatagramSocket.

Prototype

public DatagramSocket() throws SocketException 

Source Link

Document

Constructs a datagram socket and binds it to any available port on the local host machine.

Usage

From source file:be.error.rpi.test.UdpTest.java

public static void main(String[] args) throws Exception {
    final InetAddress IPAddress = InetAddress.getByName("192.168.0.10");
    final DatagramSocket clientSocket = new DatagramSocket();

    new Thread() {
        @Override//  www. j  ava2 s .  com
        public void run() {
            try {
                while (true) {
                    String s = "0:0:0:";
                    DatagramPacket sendPacket = new DatagramPacket(s.getBytes(), s.getBytes().length, IPAddress,
                            8000);
                    clientSocket.send(sendPacket);
                    Thread.sleep(100);
                }
            } catch (Exception e) {

            }
        }
    }.start();

    new Thread() {
        @Override
        public void run() {
            try {
                while (true) {
                    String s = "1:1:1:";
                    DatagramPacket sendPacket = new DatagramPacket(s.getBytes(), s.getBytes().length, IPAddress,
                            8000);
                    clientSocket.send(sendPacket);
                    Thread.sleep(100);
                }
            } catch (Exception e) {

            }
        }
    }.start();

}

---

From source file:DaytimeClient.java

public static void main(String args[]) throws java.io.IOException {
    // Figure out the host and port we're going to talk to
    String host = args[0];/*ww w.jav a 2  s.  c o  m*/
    int port = 13;
    if (args.length > 1)
        port = Integer.parseInt(args[1]);

    // Create a socket to use
    DatagramSocket socket = new DatagramSocket();

    // Specify a 1-second timeout so that receive() does not block forever.
    socket.setSoTimeout(1000);

    // This buffer will hold the response. On overflow, extra bytes are
    // discarded: there is no possibility of a buffer overflow attack here.
    byte[] buffer = new byte[512];
    DatagramPacket packet = new DatagramPacket(buffer, buffer.length, new InetSocketAddress(host, port));

    // Try three times before giving up
    for (int i = 0; i < 3; i++) {
        try {
            // Send an empty datagram to the specified host (and port)
            packet.setLength(0); // make the packet empty
            socket.send(packet); // send it out

            // Wait for a response (or timeout after 1 second)
            packet.setLength(buffer.length); // make room for the response
            socket.receive(packet); // wait for the response

            // Decode and print the response
            System.out.print(new String(buffer, 0, packet.getLength(), "US-ASCII"));
            // We were successful so break out of the retry loop
            break;
        } catch (SocketTimeoutException e) {
            // If the receive call timed out, print error and retry
            System.out.println("No response");
        }
    }

    // We're done with the channel now
    socket.close();
}

---

From source file:UDPSend.java

public static void main(String args[]) {
    try {//from  w  w w.j a  va 2s . co m
        // Check the number of arguments
        if (args.length < 3)
            throw new IllegalArgumentException("Wrong number of args");

        // Parse the arguments
        String host = args[0];
        int port = Integer.parseInt(args[1]);

        // Figure out the message to send.
        // If the third argument is -f, then send the contents of the file
        // specified as the fourth argument. Otherwise, concatenate the
        // third and all remaining arguments and send that.
        byte[] message;
        if (args[2].equals("-f")) {
            File f = new File(args[3]);
            int len = (int) f.length(); // figure out how big the file is
            message = new byte[len]; // create a buffer big enough
            FileInputStream in = new FileInputStream(f);
            int bytes_read = 0, n;
            do { // loop until we've read it all
                n = in.read(message, bytes_read, len - bytes_read);
                bytes_read += n;
            } while ((bytes_read < len) && (n != -1));
        } else { // Otherwise, just combine all the remaining arguments.
            String msg = args[2];
            for (int i = 3; i < args.length; i++)
                msg += " " + args[i];
            // Convert the message to bytes using UTF-8 encoding
            message = msg.getBytes("UTF-8");
        }

        // Get the internet address of the specified host
        InetAddress address = InetAddress.getByName(host);

        // Initialize a datagram packet with data and address
        DatagramPacket packet = new DatagramPacket(message, message.length, address, port);

        // Create a datagram socket, send the packet through it, close it.
        DatagramSocket dsocket = new DatagramSocket();
        dsocket.send(packet);
        dsocket.close();
    } catch (Exception e) {
        System.err.println(e);
        System.err.println(usage);
    }
}

---

From source file:Main.java

public static void senddatagram(InetAddress target, int port, byte[] outbuf, int len) {

    try {/*from   w  w  w.  ja  v a2s. c o  m*/
        DatagramPacket request = new DatagramPacket(outbuf, len, target, port);

        DatagramSocket socket = new DatagramSocket();
        socket.send(request);
    } catch (SocketException e) {
    } catch (IOException e) {
    }

}

---

From source file:Main.java

public static void sendWoLMagicPacket(final String broadcastIp, final String macAddress) {
    new Thread(new Runnable() {
        @Override/*from  w ww  . j a v a2 s  .  c  o  m*/
        public void run() {
            try {
                byte[] macBytes = getMacBytes(macAddress);
                byte[] bytes = new byte[6 + 16 * macBytes.length];
                for (int i = 0; i < 6; i++) {
                    bytes[i] = (byte) 0xff;
                }
                for (int i = 6; i < bytes.length; i += macBytes.length) {
                    System.arraycopy(macBytes, 0, bytes, i, macBytes.length);
                }

                InetAddress address = InetAddress.getByName(broadcastIp);
                DatagramPacket packet = new DatagramPacket(bytes, bytes.length, address, 9);
                DatagramSocket socket = new DatagramSocket();
                socket.send(packet);
                socket.close();

                packet = new DatagramPacket(bytes, bytes.length, address, 7);
                socket = new DatagramSocket();
                socket.send(packet);
                socket.close();

                Log.e("WAKE_UP", "Wake-on-LAN packet sent.");
                final String output = getStringFromBytes(bytes);
                Log.i("WAKE_UP", output);
            } catch (Exception e) {
                Log.e("WAKE_UP", "Failed to send Wake-on-LAN packet: " + e);

            }
        }
    }).start();
}

---

From source file:gravity.android.discovery.DiscoveryClient.java

public static ArrayList<DiscoveryServerInfo> findServer(WifiManager mWifi, int port, String token) {
    ArrayList<DiscoveryServerInfo> ret = new ArrayList<DiscoveryServerInfo>();

    try {//from w ww. j av a  2s. co  m
        DatagramSocket clientSocket = new DatagramSocket();
        clientSocket.setBroadcast(true);
        InetAddress IPAddress = Utils.getBroadcastAddress(mWifi);
        Log.v("DISCOVERY_CLIENT", "broadcast addr " + IPAddress.getHostAddress());
        byte[] receiveData = new byte[2048];
        byte[] sendData = new byte[128];

        sendData = token.getBytes();
        DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, port);
        Log.v("DISCOVERY_CLIENT", "sent " + token);
        clientSocket.send(sendPacket);

        long t1 = System.currentTimeMillis();
        while (System.currentTimeMillis() - t1 <= 4000) // 4 secondi
        {
            DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);

            try {
                clientSocket.setSoTimeout(500);
                clientSocket.receive(receivePacket);

                if (receivePacket.getAddress() != null && receivePacket.getAddress().getHostAddress() != null) {
                    String discovered_name, discovered_ip;
                    int discovered_port;

                    String received = new String(receivePacket.getData());

                    if (received != null) {
                        received = received.trim().substring(0, receivePacket.getLength()).trim();
                        Log.d("Recieved Msg Packet:", received);

                        //StringTokenizer st = new StringTokenizer(received, ",");

                        //Gravity Code
                        JSONObject recievedJson = new JSONObject(received);

                        try {
                            //discovered_name = st.nextToken();   
                            discovered_name = recievedJson.getString("name"); //Gravity code

                            discovered_ip = receivePacket.getAddress().getHostAddress();

                            //discovered_port = Integer.parseInt(st.nextToken());
                            discovered_port = recievedJson.getInt("port_to_share"); //Gravity code

                            Log.v("DISCOVERY_CLIENT", "discovered " + discovered_name + ", " + discovered_ip
                                    + ":" + discovered_port);

                            boolean add = true;
                            if (ret.size() > 0) {
                                for (DiscoveryServerInfo dsi : ret) {
                                    if (dsi != null && dsi.ip.equals(discovered_ip)) {
                                        add = false;
                                        break;
                                    }
                                }
                            }

                            if (add) {
                                ret.add(new DiscoveryServerInfo(discovered_name, discovered_ip,
                                        discovered_port));
                            }
                        } catch (NoSuchElementException nsee) {
                            Log.v("DISCOVERY_CLIENT", nsee.getLocalizedMessage());
                        }

                    }
                }

            } catch (SocketTimeoutException tex) {
                /* ignored */ }
        }

        clientSocket.close();
    } catch (Exception ex) {
        ex.printStackTrace();
        Log.e("DISCOVERY_CLIENT", ex.toString());
    }

    return ret;
}

---

From source file:MainClass.java

public SenderThread(InetAddress address, int port) throws SocketException {
    this.server = address;
    this.port = port;
    this.socket = new DatagramSocket();
    this.socket.connect(server, port);
}

---

From source file:poisondog.net.udp.SendMission.java

public Void execute(DatagramParameter parameter) throws IOException {
    DatagramSocket socket = new DatagramSocket();

    socket.setReuseAddress(true);// w ww  .j  a v a2s  .c  o  m
    socket.setBroadcast(parameter.getBroadcast());

    if (parameter.getTimeout() > 0)
        socket.setSoTimeout(parameter.getTimeout());

    String data = IOUtils.toString(parameter.getInputStream());
    DatagramPacket packet = new DatagramPacket(data.getBytes(), data.length());
    packet.setAddress(InetAddress.getByName(parameter.getHost()));
    if (parameter.getPort() > 0)
        packet.setPort(parameter.getPort());
    socket.send(packet);
    socket.close();
    return null;
}

---

From source file:tubessister.SenderR.java

public void run() {
    System.out.println("Sender Running ");
    try {/*from w  w w . j  a va  2  s.c o  m*/
        InetAddress IPAddress = InetAddress.getByName(targetAddress);
        DatagramSocket datagramSocket = new DatagramSocket();
        ReliableSender ReliableSender = new ReliableSender(datagramSocket);
        byte[] sendData = message.getBytes();
        DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, targetPort);
        ReliableSender.send(sendPacket);
        datagramSocket.close();
    } catch (UnknownHostException ex) {
        System.out.println("Unknown Host Exception");
    } catch (SocketException ex) {
        System.out.println("Socket  Exception");
    } catch (IOException ex) {
        System.out.println("IO Exception");
    }
    System.out.println("Send finished");
}

---

From source file:tubessister.Sender.java

public void run() {
    //System.out.println("Sender Running " );
    try {/*from   w w  w .  j a  v  a  2 s .com*/
        InetAddress IPAddress = InetAddress.getByName(targetAddress);
        DatagramSocket datagramSocket = new DatagramSocket();
        UnreliableSender unreliableSender = new UnreliableSender(datagramSocket);
        byte[] sendData = message.getBytes();
        DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, targetPort);
        unreliableSender.send(sendPacket);
        datagramSocket.close();
    } catch (UnknownHostException ex) {
        System.out.println("Unknown Host Exception");
    } catch (SocketException ex) {
        System.out.println("Socket  Exception");
    } catch (IOException ex) {
        System.out.println("IO Exception");
    }
    System.out.println("Send finished");
}

---

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