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(int port) throws SocketException

Source Link

Document

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

Usage

From source file:Main.java

public static void main(String args[]) throws IOException {
    DatagramSocket socket = new DatagramSocket(DAYTIME_PORT);
    while (true) {
        byte buffer[] = new byte[256];
        DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
        socket.receive(packet);/*from   w ww.  j  a v  a  2 s. c om*/
        String date = new Date().toString();
        buffer = date.getBytes();
        // Get response address/port for client from packet
        InetAddress address = packet.getAddress();
        int port = packet.getPort();
        packet = new DatagramPacket(buffer, buffer.length, address, port);
        socket.send(packet);
    }
}

From source file:Main.java

public static void main(String args[]) {
    try {//from  w  w  w . j a  va 2 s. c o  m

        InetAddress ia = InetAddress.getByName("www.java2s.com");

        DatagramSocket ds = new DatagramSocket(InetSocketAddress.createUnresolved("google.com", 8080));

        byte buffer[] = "hello".getBytes();
        DatagramPacket dp = new DatagramPacket(buffer, buffer.length, ia, 80);
        ds.connect(InetSocketAddress.createUnresolved("google.com", 8080));
        ds.send(dp);
        ds.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    byte[] ary = new byte[128];
    DatagramPacket pack = new DatagramPacket(ary, 128);

    // read/*from   w  w w  .  j a va  2 s  .c o m*/
    DatagramSocket sock = new DatagramSocket(1111);
    sock.receive(pack);
    String word = new String(pack.getData());
    System.out.println("From: " + pack.getAddress() + " Port: " + pack.getPort());
    System.out.println(word);
    sock.close();
    // write
    sock = new DatagramSocket();
    pack.setAddress(InetAddress.getByName(args[1]));
    pack.setData(args[2].getBytes());
    pack.setPort(1111);
    sock.send(pack);
    sock.close();

}

From source file:PacketReceiver.java

public static void main(String[] args) throws Exception {
    byte[] buffer = new byte[1024];
    DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
    DatagramSocket socket = new DatagramSocket(5002);
    socket.receive(packet);/*ww w .  ja va2s .c  om*/
    System.out.println(packet.getSocketAddress());
    buffer = packet.getData();
    System.out.println(new String(buffer));
}

From source file:Main.java

public static void main(String args[]) {
    try {// w w w. ja va2  s  . co m

        int port = 80;

        DatagramSocket ds = new DatagramSocket(port);

        byte buffer[] = new byte[BUFSIZE];

        while (true) {

            DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
            // Receive data
            ds.receive(dp);
            // Display address from the datagram packet
            InetAddress ia = dp.getAddress();
            System.out.println(ia);

            dp.setData(buffer);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

From source file:Main.java

public static void main(String args[]) {
    try {//from   ww w  .  ja va 2s.  c o m

        int port = 80;

        DatagramSocket ds = new DatagramSocket(port);

        byte buffer[] = new byte[BUFSIZE];

        while (true) {

            DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
            // Receive data
            ds.receive(dp);
            // Display address from the datagram packet
            InetAddress ia = dp.getAddress();
            System.out.println(ia);

            dp.setSocketAddress(InetSocketAddress.createUnresolved("google.com", 8080));
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

From source file:Main.java

public static void main(String[] args) {
    try {// ww  w  .  j av  a  2 s .  com
        byte[] buffer = new byte[1024];
        DatagramPacket packet = new DatagramPacket(buffer, buffer.length);

        DatagramSocket socket = new DatagramSocket(5002);

        System.out.println("Waiting for a packet...");
        socket.receive(packet);

        System.out.println("Just received packet from " + packet.getSocketAddress());
        buffer = packet.getData();

        System.out.println(new String(buffer));

    } catch (IOException e) {
        e.printStackTrace();
    }
}

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;//from   w ww.  j a  va 2  s. co m
    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;
        }
    }

}

From source file:MainClass.java

public static void main(String[] args) {

    for (int port = 1024; port <= 65535; port++) {
        try {/*  w ww  .ja  v a  2  s.c  o  m*/
            // the next line will fail and drop into the catch block if
            // there is already a server running on port i
            DatagramSocket server = new DatagramSocket(port);
            server.close();
        } catch (SocketException ex) {
            System.out.println("There is a server on port " + port + ".");
        }
    }
}

From source file:UdpEchoServer.java

public static void main(String[] args) {
    DatagramSocket sock;/*from  w  ww  .j a  v  a  2s  .  co m*/
    DatagramPacket pack = new DatagramPacket(new byte[BUFFERSIZE], BUFFERSIZE);
    try {
        sock = new DatagramSocket(7);
    } catch (SocketException e) {
        System.out.println(e);
        return;
    }
    // echo back everything
    while (true) {
        try {
            sock.receive(pack);
            sock.send(pack);
        } catch (IOException ioe) {
            System.out.println(ioe);
        }
    }
}