Example usage for java.net DatagramPacket getOffset

Introduction

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

Prototype

public synchronized int getOffset() 

Source Link

Document

Returns the offset of the data to be sent or the offset of the data received.

Usage

From source file:Main.java

public static void main(String[] args) throws Exception {
    int mcPort = 12345;
    String mcIPStr = "230.1.1.1";
    MulticastSocket mcSocket = null;
    InetAddress mcIPAddress = null;
    mcIPAddress = InetAddress.getByName(mcIPStr);
    mcSocket = new MulticastSocket(mcPort);
    System.out.println("Multicast Receiver running at:" + mcSocket.getLocalSocketAddress());
    mcSocket.joinGroup(mcIPAddress);//from  www. ja v  a 2  s  . c o  m

    DatagramPacket packet = new DatagramPacket(new byte[1024], 1024);

    System.out.println("Waiting for a  multicast message...");
    mcSocket.receive(packet);
    String msg = new String(packet.getData(), packet.getOffset(), packet.getLength());
    System.out.println("[Multicast  Receiver] Received:" + msg);

    mcSocket.leaveGroup(mcIPAddress);
    mcSocket.close();
}

---

From source file:Main.java

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

        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);

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

---

From source file:Main.java

public static void displayPacketDetails(DatagramPacket packet) {
    byte[] msgBuffer = packet.getData();
    int length = packet.getLength();
    int offset = packet.getOffset();

    int remotePort = packet.getPort();
    InetAddress remoteAddr = packet.getAddress();
    String msg = new String(msgBuffer, offset, length);

    System.out.println(//  w  w w. j av  a2 s  .com
            "Received a  packet:[IP Address=" + remoteAddr + ", port=" + remotePort + ", message=" + msg + "]");
}

---

From source file:Main.java

public static void displayPacketDetails(DatagramPacket packet) {
    byte[] msgBuffer = packet.getData();
    int length = packet.getLength();
    int offset = packet.getOffset();
    int remotePort = packet.getPort();
    InetAddress remoteAddr = packet.getAddress();
    String msg = new String(msgBuffer, offset, length);
    System.out.println("[Server at IP  Address=" + remoteAddr + ", port=" + remotePort + "]: " + msg);
}

---

From source file:org.openehealth.ipf.commons.ihe.core.atna.UdpServer.java

private static String packetToString(DatagramPacket packet) {
    return new String(packet.getData(), packet.getOffset(), packet.getLength());
}

---

From source file:net.jradius.packet.PacketFactory.java

/**
 * Parse a UDP RADIUS message//from   ww  w  .java  2s.  c  om
 * @param dp The Datagram to be parsed
 * @return Returns the RadiusPacket
 * @throws RadiusException
 */
public static RadiusPacket parse(DatagramPacket dp, boolean pool) throws RadiusException {
    ByteBuffer buffer = ByteBuffer.wrap(dp.getData(), dp.getOffset(), dp.getLength());
    RadiusPacket rp = null;

    try {
        rp = parseUDP(buffer, pool);
    } catch (IOException e) {
        RadiusLog.error(e.getMessage(), e);
    }

    return rp;
}

---

From source file:org.nuxeo.runtime.detection.MulticastDetector.java

private String readHeartBeat(DatagramPacket p) {
    return new String(p.getData(), p.getOffset(), p.getLength());
}

---

From source file:com.springrts.springls.nat.NatHelpServer.java

/**
 * check UDP server for any new packets//from   www.jav a2s . c om
 */
private void checkForNewPackets() {

    DatagramPacket packet;
    while ((packet = fetchNextPackage()) != null) {
        InetAddress address = packet.getAddress();
        int clientPort = packet.getPort();
        String data = new String(packet.getData(), packet.getOffset(), packet.getLength());
        LOG.trace("*** UDP packet received from {} from port {}", address.getHostAddress(), clientPort);
        Client client = getContext().getClients().getClient(data);
        if (client == null) {
            continue;
        }
        client.setUdpSourcePort(clientPort);
        client.sendLine(String.format("UDPSOURCEPORT %d", clientPort));
    }
}

---

From source file:net.di2e.ddf.argo.probe.responder.ProbeHandler.java

@Override
public void run() {
    LOGGER.debug("Listening for any multicast packets.");
    String data = "";
    while (!isCanceled) {
        try {// w  ww  . j  av a 2  s.  c  o  m
            byte buf[] = new byte[1024];
            DatagramPacket pack = new DatagramPacket(buf, buf.length);
            socket.receive(pack);
            data = new String(pack.getData(), pack.getOffset(), pack.getLength());
            LOGGER.debug("Packet received with the following payload: {}.", data);
            Probe probe = JAXB.unmarshal(new StringReader(data), Probe.class);

            List<RespondTo> respondTo = probe.getRa().getRespondTo();

            boolean ignoreProbe = false;
            if (ignoreProbesList != null && !ignoreProbesList.isEmpty()) {
                for (String ignoreProbeString : ignoreProbesList) {
                    String updatedIgnoreString = expandRespondToAddress(ignoreProbeString);
                    // TODO cache the request ID and use that instead of the local hostname
                    if (StringUtils.equalsIgnoreCase(updatedIgnoreString, respondTo.get(0).getValue())) {
                        LOGGER.debug(
                                "Configuration is set to ignore probes that have a respondTo of '{}'. Incoming probe contains respondTo of '{}'. IGNORING PROBE.",
                                ignoreProbeString, respondTo.get(0).getValue());
                        ignoreProbe = true;
                    }
                }
            }
            if (!ignoreProbe) {
                List<String> contractIDs = probe.getScids().getServiceContractID();
                // TODO handle the different contractID
                // URI contractId = probe.getContractID();
                String probeId = probe.getId();
                String response = generateServiceResponse(probe.getRespondToPayloadType(), contractIDs,
                        probeId);

                if (StringUtils.isNotBlank(response)) {
                    LOGGER.debug("Returning back to {} with the following response:\n{}",
                            respondTo.get(0).getValue(), response);
                    sendResponse(respondTo.get(0).getValue(), response, probe.getRespondToPayloadType());
                } else {
                    LOGGER.debug(
                            "No services found that match the incoming contract IDs, not sending a response.");
                }
            }
        } catch (DataBindingException e) {
            LOGGER.warn("Issue parsing probe response: {}", data, e);
        } catch (SocketTimeoutException ste) {
            LOGGER.trace("Received timeout on socket, resetting socket to check for cancellation.");
        } catch (IOException ioe) {
            if (!isCanceled) {
                LOGGER.warn("Error while trying to receive a packet, shutting down listener", ioe);
            }
            break;
        }
    }
    if (isCanceled) {
        LOGGER.debug("Listener was canceled, not receiving any more multicast packets.");
    }

}

---

From source file:org.avineas.fins.gw.Gateway.java

private void traceDatagram(String prefix, DatagramPacket packet) {
    if (!logger.isDebugEnabled())
        return;// w w  w.j ava 2s  . com
    StringBuffer buffer = new StringBuffer(prefix).append(":");
    byte[] data = packet.getData();
    int offset = packet.getOffset();
    for (int cnt = 0; cnt < packet.getLength(); cnt++) {
        int thisByte = data[cnt + offset] & 0xff;
        buffer.append(" ").append(Integer.toHexString(thisByte));
    }
    logger.debug(buffer.toString());
}

---

• «
• 1
• 2
• 3
• »