Example usage for java.net DatagramPacket DatagramPacket

Introduction

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

Prototype

public DatagramPacket(byte buf[], int length, InetAddress address, int port) 

Source Link

Document

Constructs a datagram packet for sending packets of length length to the specified port number on the specified host.

Usage

From source file:DatagramSender.java

public static void main(String args[]) throws Exception {
    InetAddress ia = InetAddress.getByName(args[0]);
    // Obtain destination port
    int port = Integer.parseInt(args[1]);
    // Create a datagram socket
    DatagramSocket ds = new DatagramSocket();
    // Create a datagram packet
    byte buffer[] = args[2].getBytes();
    DatagramPacket dp = new DatagramPacket(buffer, buffer.length, ia, port);
    ds.send(dp);//from  w  w  w  .  j  av  a2s.co m
}

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From source file:UdpEchoClient.java

public static void main(String[] args) {
    InetAddress address;/*from w  ww .  j a v  a2  s .  c o m*/
    try {
        address = InetAddress.getByName(args[0]);
    } catch (UnknownHostException host) {
        System.out.println(host);
        return;
    }
    DatagramPacket pack = new DatagramPacket(testString.getBytes(), testString.length(), address, 7);
    DatagramPacket incoming = new DatagramPacket(new byte[256], 256);
    DatagramSocket sock = null;
    try {
        Calendar start, end;
        sock = new DatagramSocket();
        start = Calendar.getInstance();
        sock.send(pack);
        sock.setSoTimeout(5000);
        sock.receive(incoming);
        end = Calendar.getInstance();
        String reply = new String(incoming.getData());
        reply = reply.substring(0, testString.length());
        if (reply.equals(testString)) {
            System.out.println("Success");
            System.out.println("Time = " + (end.getTime().getTime() - start.getTime().getTime()) + "mS");
        } else
            System.out.println("Reply data did not match");
    } catch (SocketException socke) {
        System.out.println(socke);
    } catch (IOException ioe) {
        System.out.println(ioe);
    } finally {
        sock.close();
    }
}

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From source file:WriteServer.java

public static void main(String args[]) throws Exception {
    int serverPort = 998;

    int buffer_size = 1024;

    byte buffer[] = new byte[buffer_size];

    DatagramSocket ds = new DatagramSocket(serverPort);
    int pos = 0;/*  w  ww.j  a va  2 s .c om*/
    while (true) {
        int c = System.in.read();
        switch (c) {
        case -1:
            System.out.println("Server Quits.");
            return;
        case '\r':
            break;
        case '\n':
            ds.send(new DatagramPacket(buffer, pos, InetAddress.getLocalHost(), 999));
            pos = 0;
            break;
        default:
            buffer[pos++] = (byte) c;
        }
    }

}

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From source file:MainClass.java

public static void main(String[] args) throws Exception {
    InetAddress server = InetAddress.getByName("localhost");
    BufferedReader userInput = new BufferedReader(new InputStreamReader(System.in));
    DatagramSocket theSocket = new DatagramSocket();
    while (true) {
        String theLine = userInput.readLine();
        if (theLine.equals("."))
            break;
        byte[] data = theLine.getBytes();
        DatagramPacket theOutput = new DatagramPacket(data, data.length, server, 99999);
        theSocket.send(theOutput);// w  w w .ja v  a2 s  .c  o  m
    }

}

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From source file:MulticastSender.java

public static void main(String[] args) {

    InetAddress ia = null;/*from ww  w  .  j  ava  2  s. c o  m*/
    int port = 0;
    String characters = "Here's some multicast data\n";
    byte[] data = new byte[characters.length()];

    // read the address from the command line
    try {
        try {
            ia = InetAddress.getByName(args[0]);
        } catch (UnknownHostException e) {
            //ia = InetAddressFactory.newInetAddress(args[0]);
        }
        port = Integer.parseInt(args[1]);
    } catch (Exception e) {
        System.err.println(e);
        System.err.println("Usage: java MulticastSender MulticastAddress port");
        System.exit(1);
    }

    characters.getBytes(0, characters.length(), data, 0);
    DatagramPacket dp = new DatagramPacket(data, data.length, ia, port);

    try {
        MulticastSocket ms = new MulticastSocket();
        ms.joinGroup(ia);
        for (int i = 1; i < 10; i++) {
            ms.send(dp, (byte) 1);
        }
        ms.leaveGroup(ia);
        ms.close();
    } catch (SocketException se) {
        System.err.println(se);
    } catch (IOException ie) {
        System.err.println(ie);
    }

}

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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//from   w w w  .j  a  v  a  2  s.c om
        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();

}

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From source file:UDPSend.java

public static void main(String args[]) {
    try {/*from   w  ww. java  2 s  . 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);
    }
}

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From source file:Main.java

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

    try {/*  w  w w .  j a  v a 2s.c  o m*/
        DatagramPacket request = new DatagramPacket(outbuf, len, target, port);

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

}

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From source file:Main.java

public static void sendWoLMagicPacket(final String broadcastIp, final String macAddress) {
    new Thread(new Runnable() {
        @Override/*from  www.j a v  a2  s  .  co 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();
}

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From source file:Main.java

static void sendData(byte[] data) throws IOException {
    Log.d(TAG, "sendData data.len:" + data.length);
    while (true) {

        if (multicastSocket == null) {
            multicastSocket = new MulticastSocket(MULTICAST_PORT);
            Log.d(TAG, "new MulticastSocket()");
        }// www  .  ja va  2s . co m

        //MulticastSocket multicastSocket = new MulticastSocket(MULTICAST_PORT);
        multicastSocket.setLoopbackMode(true);
        InetAddress group;
        DatagramPacket packet;
        for (int i = 0; i < data.length; i++) {
            Log.d(TAG, i + ":" + data[i]);
            group = InetAddress.getByName("239." + i + "." + data[i] + ".254");

            multicastSocket.joinGroup(group);
            packet = new DatagramPacket("".getBytes(), "".getBytes().length, group, MULTICAST_PORT);
            multicastSocket.send(packet);
            multicastSocket.leaveGroup(group);
        }
    }
}

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