Tuesday, May 29, 2012

Datagram Server in Java

This example is about Datagram Server or UDP server purpose of this example is to provide a fare idea about the working of UDP client server this server example works with client example and link to the client example is given at the end of this code example works on the concept of UDP protocol (simple transmission model without implicit handshaking)


import java.io.*;

import java.net.*;

public class Server {

    public static void main(String[] args) {

        DatagramSocket serverSkt= null;

        try{

            serverSkt = new DatagramSocket(3030);

        }

        catch(SocketException exp)

        {

            System.out.println(exp);

        }

        byte[] receiveData = new byte[1024];

        byte[] sendData = new byte[1024];

        while(true)

          {

            DatagramPacket receivePkt = new DatagramPacket(receiveData, receiveData.length);

            try{

                serverSkt.receive(receivePkt);

            }

            catch(IOException exp)

            {

                System.out.println(exp);

            }

            String sentence = new String( receivePkt.getData());

            System.out.println("RECEIVED: " + sentence);

            InetAddress IPAddress = receivePkt.getAddress();

            int port = receivePkt.getPort();

            String capitalizedSentence = sentence.toUpperCase();

            sendData = capitalizedSentence.getBytes();

            DatagramPacket sendPkt =

            new DatagramPacket(sendData, sendData.length, IPAddress, port);

            try{

            serverSkt.send(sendPkt);

            }

            catch(IOException exp)

            {

                System.out.println(exp);

            }   

        }

      }        

  }
Datagram Client Source

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