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:Main.java

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

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

        DatagramSocket ds = new DatagramSocket(8080, ia);

        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();
    }
}

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From source file:Main.java

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

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From source file:Main.java

public static void main(String[] args) throws Exception {
    DatagramSocket ds = new DatagramSocket(3000);
    byte[] buf = new byte[1024];
    DatagramPacket dp = new DatagramPacket(buf, 1024);
    ds.receive(dp);//from   w  w w . j av  a 2  s . c  o m
    String strRecv = new String(dp.getData(), 0, dp.getLength()) + " from " + dp.getAddress().getHostAddress()
            + ":" + dp.getPort();
    System.out.println(strRecv);
    ds.close();
}

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From source file:Main.java

public static void main(String args[]) {
    try {/*w  w  w  .  j  a  v a2s .com*/

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

        DatagramSocket ds = new DatagramSocket(8080, ia);

        byte buffer[] = "hello".getBytes();
        DatagramPacket dp = new DatagramPacket(buffer, buffer.length, ia, 80);
        ds.connect(InetSocketAddress.createUnresolved("google.com", 8080));

        DatagramChannel channel = ds.getChannel();

        ds.send(dp);
        ds.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    int mcPort = 12345;
    String mcIPStr = "230.1.1.1";
    DatagramSocket udpSocket = new DatagramSocket();

    InetAddress mcIPAddress = InetAddress.getByName(mcIPStr);
    byte[] msg = "Hello".getBytes();
    DatagramPacket packet = new DatagramPacket(msg, msg.length);
    packet.setAddress(mcIPAddress);/*from   w  w w . j  ava  2s .c  o  m*/
    packet.setPort(mcPort);
    udpSocket.send(packet);

    System.out.println("Sent a  multicast message.");
    System.out.println("Exiting application");
    udpSocket.close();
}

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From source file:GetDate.java

public static void main(String args[]) throws Exception {
    byte msg[] = new byte[256];
    DatagramSocket dgSocket = new DatagramSocket();
    InetAddress destination = InetAddress.getByName("web.mit.edu");
    DatagramPacket datagram = new DatagramPacket(msg, msg.length, destination, PortDayTime);
    dgSocket.send(datagram);//from  ww  w  .  ja  v  a2s. c o m
    datagram = new DatagramPacket(msg, msg.length);
    dgSocket.receive(datagram);
    String received = new String(datagram.getData());
    System.out.println("The time in Cambridge is now: " + received);
    dgSocket.close();
}

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From source file:Main.java

public static void main(String[] args) throws Exception {
    DatagramSocket udpSocket = new DatagramSocket();
    String msg = null;/*ww  w  . ja  v a2  s .  c  om*/
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.print("Please enter a  message  (Bye  to quit):");
    while ((msg = br.readLine()) != null) {
        if (msg.equalsIgnoreCase("bye")) {
            break;
        }
        DatagramPacket packet = Main.getPacket(msg);
        udpSocket.send(packet);
        udpSocket.receive(packet);
        displayPacketDetails(packet);
        System.out.print("Please enter a  message  (Bye  to quit):");
    }
    udpSocket.close();
}

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From source file:UdpEchoClient.java

public static void main(String[] args) {
    InetAddress address;/*from w  w  w  .j  a v  a  2 s. co  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: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];//from w  w w.ja va  2s .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();
}

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From source file:SDRecord.java

public static void main(String[] args) {

    boolean recordToInf = false;
    long recordTo = 0, txsize = 0, wr = 0, max = 0;
    int sourcePort = 0, destPort = 0;
    String val;
    OutputStream writer = null;//ww  w  .ja v  a  2  s.c  o  m
    InetAddress rhost = null, lhost = null;
    DatagramSocket socket = null;

    //Default values
    int buffSize = 1500;
    try {
        lhost = InetAddress.getByName("0.0.0.0");
    } catch (UnknownHostException e1) {
        System.err.println("ERROR!: Host not reconized");
        System.exit(3);
    }
    recordToInf = true;
    sourcePort = 7355;

    Options options = new Options();

    options.addOption("m", true, "Minutes to record, default is no limit");
    options.addOption("l", true, "Bind to a specific local address, default is 0.0.0.0");
    options.addOption("p", true, "Local port to use, default is 7355");
    options.addOption("r", true, "Remote address where to send data");
    options.addOption("d", true, "Remote port, to use with -r option");
    options.addOption("f", true, "Output file where to save the recording");
    options.addOption("s", true, "Stop recording when reaching specified MBs");
    options.addOption("h", false, "Help");

    CommandLineParser parser = new DefaultParser();
    CommandLine cmd = null;
    try {
        cmd = parser.parse(options, args);
    } catch (ParseException e1) {
        System.err.println("ERROR!: Error while parsing the command line");
        System.exit(1);
    }

    if (cmd.hasOption("m")) {
        val = cmd.getOptionValue("m");
        try {
            if (Long.parseLong(val) < 0) {
                System.err.println("ERROR!: -m argument value cannot be negative");
                System.exit(3);
            }
            recordTo = System.currentTimeMillis() + (Long.parseLong(val) * 60000);
            recordToInf = false;
        } catch (NumberFormatException e) {
            System.err.println("ERROR!: -m argument not an integer");
            System.exit(3);
        }
    }

    if (cmd.hasOption("l")) {
        val = cmd.getOptionValue("l");
        try {
            lhost = InetAddress.getByName(val);
        } catch (UnknownHostException e) {
            System.err.println("ERROR!: Host not reconized");
            System.exit(3);
        }
    }

    if (cmd.hasOption("p")) {
        val = cmd.getOptionValue("p");
        try {
            sourcePort = Integer.parseInt(val);
        } catch (NumberFormatException e) {
            System.err.println("ERROR!: -p argument not an integer");
            System.exit(3);
        }
    }

    if (cmd.hasOption("r")) {
        val = cmd.getOptionValue("r");
        try {
            rhost = InetAddress.getByName(val);
        } catch (UnknownHostException e) {
            System.err.println("ERROR!: Host not reconized");
            System.exit(3);
        }
    }

    if (cmd.hasOption("d")) {
        val = cmd.getOptionValue("d");
        try {
            destPort = Integer.parseInt(val);
        } catch (NumberFormatException e) {
            System.err.println("-ERROR!: -d argument not an integer");
            System.exit(3);
        }
    }

    if (cmd.hasOption("f")) {
        val = cmd.getOptionValue("f");
        try {
            writer = new FileOutputStream(val);
        } catch (FileNotFoundException e) {
            System.err.println("ERROR!: File not found");
            System.exit(3);
        }
    }

    if (cmd.hasOption("s")) {
        val = cmd.getOptionValue("s");

        try {
            max = (long) (Double.parseDouble(val) * 1000000);
        } catch (NumberFormatException e) {
            System.err.println("ERROR!: -s argument not valid");
            System.exit(3);
        }

        if (Double.parseDouble(val) < 0) {
            System.err.println("ERROR!: -s argument value cannot be negative");
            System.exit(3);
        }

    }

    if (cmd.hasOption("h")) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp("SDRecord", options);
        System.exit(0);
    }

    try {
        socket = new DatagramSocket(sourcePort, lhost);
        //socket options
        socket.setReuseAddress(true);
    } catch (SocketException e) {
        e.printStackTrace();
        System.exit(3);
    }

    byte[] buffer = new byte[buffSize];
    DatagramPacket packet = new DatagramPacket(buffer, buffer.length);

    System.err.println("Listening " + lhost.toString() + " on port " + sourcePort);

    while (recordToInf == true || System.currentTimeMillis() <= recordTo) {
        //Stop recording when reaching max bytes
        if (max != 0 && txsize >= max)
            break;

        packet.setData(buffer);
        try {
            socket.receive(packet);
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(4);
        }

        //Ignoring packets with no data
        if (basicFilter(packet) == null)
            continue;

        if (writer == null && rhost == null)
            wr = recordToStdout(packet);
        if (writer != null)
            wr = recordToFile(packet, writer);
        if (rhost != null)
            wr = recordToSocket(packet, socket, rhost, destPort);

        txsize += wr;
        System.err
                .print("\r" + formatSize(txsize) + " transferred" + "\033[K" + "\t Press Ctrl+c to terminate");
    }
    //closing socket and exit
    System.err.print("\r" + formatSize(txsize) + " transferred" + "\033[K");
    socket.close();
    System.out.println();
    System.exit(0);
}

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