UDP Client Server Programming

UDP Client Server Programming //client:
import java.io.*;
import java.net.*;

class Udpcsr {
    public static void main(String args[]) throws Exception
    {
while(true)
{

      BufferedReader inFromUser =
        new BufferedReader(new InputStreamReader(System.in));

      DatagramSocket clientSocket = new DatagramSocket();

      InetAddress IPAddress = InetAddress.getByName("localhost");

      byte[] sendData = new byte[1024];
      byte[] receiveData = new byte[1024];

      String sentence = inFromUser.readLine();

      sendData = sentence.getBytes();

      DatagramPacket sendPacket =
         new DatagramPacket(sendData, sendData.length, IPAddress, 8080);

      clientSocket.send(sendPacket);

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

      clientSocket.receive(receivePacket);

      String modifiedSentence =
          new String(receivePacket.getData());

      System.out.println("FROM SERVER:" + modifiedSentence);
clientSocket.close();
    
 }
    }
}





//server:
import java.io.*;
import java.net.*;

class Udpssr {
  public static void main(String args[]) throws Exception
    {

      DatagramSocket serverSocket = new DatagramSocket(8080);

      byte[] receiveData = new byte[1024];
      byte[] sendData  = new byte[1024];

      while(true)
        {

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

          serverSocket.receive(receivePacket);

          String sentence = new String(receivePacket.getData());
 System.out.println("From client:"+" "+sentence);
          InetAddress IPAddress = receivePacket.getAddress();
 BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
 String sentencesend = br.readLine();
 sendData = sentencesend.getBytes();



          int port = receivePacket.getPort();

         

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

          serverSocket.send(sendPacket);

        }
    }
}