UDPSocketServer.java

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;

public class UDPSocketServer {
    DatagramSocket socket = null;

    public UDPSocketServer() {

    }

    public void createAndListenSocket() {
        try {
            socket = new DatagramSocket(9876);
            byte[] incomingData = new byte[1024];
            while (true) {
            DatagramPacket incomingPacket = new DatagramPacket(incomingData, incomingData.length);
            socket.receive(incomingPacket);
            byte[] data = incomingPacket.getData();
            ByteArrayInputStream in = new ByteArrayInputStream(data);
            ObjectInputStream is = new ObjectInputStream(in);
            try {
            Student student = (Student) is.readObject();
            System.out.println("Student object received = "+student);
            } catch (ClassNotFoundException e) {
            e.printStackTrace();
            }
            InetAddress IPAddress = incomingPacket.getAddress();
            int port = incomingPacket.getPort();
            String reply = "Thank you for the message";
            byte[] replyBytea = reply.getBytes();
            DatagramPacket replyPacket =
            new DatagramPacket(replyBytea, replyBytea.length, IPAddress, port);
            socket.send(replyPacket);
            Thread.sleep(2000);
            System.exit(0);
        }
        } catch (SocketException e) {
            e.printStackTrace();
        } catch (IOException i) {
            i.printStackTrace();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        UDPSocketServer server = new UDPSocketServer();
        server.createAndListenSocket();
    }
}