vs_uebung4/VerteilteSysteme-Examples/src/verteiltesysteme/socket/timecounter/UDPTimeCounterServer.java

package verteiltesysteme.socket.timecounter;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

class UDPTimeCounterServer {
	private static long counter = 0;
	
	public static void main(String args[]) throws Exception {
		int udpPort = 36038;
		@SuppressWarnings("resource")
		DatagramSocket serverSocket = new DatagramSocket(udpPort);
		byte[] receiveData = new byte[1024];
		byte[] sendData = new byte[1024];
		DateFormat df = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");

		while (true) {
			DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
			serverSocket.receive(receivePacket);
			long number = new Long(new String(receivePacket.getData(), 0, receivePacket.getLength()));

			InetAddress IPAddress = receivePacket.getAddress();
			int clientSrcPort = receivePacket.getPort();

			counter += number;
			sendData = (Long.toString(counter) + " Zeit: " + System.currentTimeMillis() + " " + df.format(new Date(System.currentTimeMillis()))).getBytes();
			DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, clientSrcPort);
			serverSocket.send(sendPacket);
		}
	}
}