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Java-Quelltext

/**
* check, if the remote port is open
*
* @param hostname hostname or ip address
* @param port number of port to check
* @param timeout timeout in seconds
*/
public static boolean checkIfRemotePortAvailable (String hostname, int port, int timeout) throws SocketException {
    Socket s = new Socket();
    s.setReuseAddress(true);
    SocketAddress sa = new InetSocketAddress(hostname, port);

    try {
        s.connect(sa, timeout * 1000);
    } catch (IOException e) {
        return false;
    } finally {
        if (s.isConnected()) {
            try {
                s.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

            return true;
        } else {
            return false;
        }
    }
}

Java-Quelltext

/**
* check, if the remote udp port is open
*
* @param hostname hostname or ip address
* @param port number of port to check
* @param timeout timeout in seconds
*
* @return true, if port is open
*/
public static boolean checkIfUDPPortIsOpen (String hostname, int port, int timeout) {
    try{
        //create inet address
        InetAddress address = InetAddress.getByName(hostname);

        byte [] bytes = new byte[128];
        DatagramSocket ds = new DatagramSocket();
        DatagramPacket dp = new DatagramPacket(bytes, bytes.length);
        ds.setSoTimeout(timeout);
        ds.connect(address, port);
        ds.send(dp);
        ds.isConnected();
        dp = new DatagramPacket(bytes, bytes.length);
        ds.receive(dp);
        ds.close();

        return true;
    } catch(InterruptedIOException e){
        //System.out.println("closed");
        return false;
    } catch(IOException e){
        //System.out.println("closed");
        return false;
    }
}