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 offset, int length, InetAddress address, int port) 

Source Link

Document

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

Usage

From source file:Main.java

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

        int port = 80;

        DatagramSocket ds = new DatagramSocket(port);

        while (true) {
            byte buffer[] = new byte[BUFSIZE];

            DatagramPacket dp = new DatagramPacket(buffer, 0, buffer.length,
                    InetAddress.getByName("google.com"), 8080);

            ds.receive(dp);

            String str = new String(dp.getData());

            System.out.println(str);
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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From source file:ca.viaware.dlna.ssdp.SSDPService.java

public void run() {
    try {// w  ww. j av a 2  s  . co m
        this.listener = new MulticastListener(this);
        this.listener.start();

        Searcher searcher = new Searcher(this.outSock);
        searcher.start();
    } catch (IOException e) {
        e.printStackTrace();
    }

    Thread advertiser = new Thread(new Runnable() {
        public void send(String data) {
            try {
                byte[] bytes = data.getBytes("UTF-8");
                DatagramPacket packet = new DatagramPacket(bytes, 0, bytes.length,
                        InetAddress.getByName("239.255.255.250"), 1900);
                outSock.send(packet);
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        public void sendNotify(String usn, String nt, String uid) {
            String http = "NOTIFY * HTTP/1.1\n";
            http += baseAnnounce;
            http += "NT: " + nt + "\r\n";
            http += "USN: " + usn + "\r\n";
            http += "LOCATION: http://" + httpConfig.getString("host") + ":" + httpConfig.getInt("port") + "/"
                    + uid + "/\r\n";
            http += "\r\n";
            send(http);
        }

        @Override
        public void run() {
            while (true) {
                Log.info("SSDP: Advertising...");
                for (int i = 0; i < 3; i++) {
                    for (Device d : DeviceManager.getDevices()) {
                        sendNotify("uuid: " + d.getUid() + "::upnp:rootdevice", "upnp:rootdevice", d.getUid());
                        sendNotify("uuid:" + d.getUid(), "uuid:" + d.getUid(), d.getUid());
                        sendNotify(
                                "uuid:" + d.getUid() + "::urn:schemas-upnp-org:device:" + d.getType() + ":"
                                        + d.getVersion(),
                                "urn:schemas-upnp-org:device:" + d.getType() + ":" + d.getVersion(),
                                d.getUid());
                        for (Service s : d.getServices()) {
                            sendNotify(
                                    "uuid:" + d.getUid() + "::urn:schemas-upnp-org:service:" + s.getType() + ":"
                                            + s.getVersion(),
                                    "urn:schemas-upnp-org:service:" + s.getType() + ":" + s.getVersion(),
                                    d.getUid());
                        }
                    }
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                try {
                    Thread.sleep(30 * 1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    });

    advertiser.start();

    Log.info("Started SSDP Service");
}

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