Example usage for java.net DatagramSocket close

Introduction

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

Prototype

public void close()

Source Link

Document

Closes this datagram socket.

Usage

From source file:MainClass.java

public static void main(String[] args) {

    for (int port = 1024; port <= 65535; port++) {
        try {/* w w w.j  a  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:UDPSend.java

public static void main(String args[]) {
    try {//  w w w.  j  a  v  a  2s. c  o  m
        String host = "www.java2s.com";
        int port = 90;

        byte[] message = "Java Source and Support".getBytes();

        // 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);
    }
}

From source file:UDPSend.java

public static void main(String args[]) {
    try {// w ww . j a v a  2 s  . c  o 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 main(String args[]) {
    try {// w  w w.  java  2 s  .  c  om

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

        DatagramSocket ds = new DatagramSocket();

        byte buffer[] = "hello".getBytes();
        DatagramPacket dp = new DatagramPacket(buffer, buffer.length, ia, 80);

        // Send the datagram packet
        ds.send(dp);
        ds.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

From source file:Main.java

public static void main(String args[]) throws IOException {
    String host = args[0];//from   w w  w.j  a  v a2s  . c  om
    byte message[] = new byte[256];
    InetAddress address = InetAddress.getByName(host);
    System.out.println("Checking at: " + address);
    DatagramPacket packet = new DatagramPacket(message, message.length, address, DAYTIME_PORT);
    DatagramSocket socket = new DatagramSocket();
    socket.send(packet);
    packet = new DatagramPacket(message, message.length);
    socket.receive(packet);
    String time = new String(packet.getData());
    System.out.println(time);
    socket.close();
}

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  av a 2 s. co  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:UDP0.java

public static void main(String[] args) throws Exception {
    byte[] ary = new byte[128];
    DatagramPacket pack = new DatagramPacket(ary, 128);
    if (args[0].charAt(0) == 'r') {
        // read/*from  ww  w . j  a  v a2s. co 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();
    } else { // write
        DatagramSocket 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:Main.java

public static void main(String args[]) {
    try {//  www.ja v  a 2s .  c  o  m

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

        DatagramSocket ds = new DatagramSocket();

        byte buffer[] = "hello".getBytes();
        DatagramPacket dp = new DatagramPacket(buffer, buffer.length, ia, 80);
        ds.bind(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[]) {
    try {/* w  ww.jav  a  2  s .c o m*/

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

        DatagramSocket ds = new DatagramSocket();

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

From source file:Main.java

public static void main(String args[]) {
    try {//from ww  w .  j  av  a2  s. c  om

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

        DatagramSocket ds = new DatagramSocket();

        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();
    }
}