Client Server Communication - Datagram Sockets

// Socket Programing – Datagram Sockets

// Client Server Communication

// Server Program

import java.io.*;

import java.net.*;

public class UDPServer

{

     public static void main(String as[]) throws IOException

     {

          DatagramSocket ds;

          DatagramPacket dp;

         

          final int buf_size = 512;

          final int port = 1500;

         

          byte msg_rec[] = new byte[buf_size];

         

          try

          {

              ds = new DatagramSocket(port);

             

              dp = new DatagramPacket(msg_rec, Buf_size);

              ds.receive(dp);

                  

              String Msg = "Welcome " + (new String(dp.getData())).trim();

              System.out.println(Msg);

          }

          catch(Exception e)

          {

              System.out.println("Exception " + e);

          }

     }

}

             

             

             

             

// Socket Programing – Datagram Sockets

// Client Server Communication

// Client Program

import java.io.*;

import java.net.*;

import java.util.*;

public class UDPClient

{

     public static void main(String as[]) throws IOException

     {

          DatagramSocket ds;

          DatagramPacket dp;

         

          final int port = 1500;

          final int buf_size = 512;

         

          Scanner s = new Scanner(System.in);

         

          byte[] msg_send = new byte[buf_size];    

         

          try

          {

              ds = new DatagramSocket();

              System.out.print("Enter data to send : ");

              String data = s.nextLine();

             

              msg_send = data.getBytes();

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

             

              dp = new DatagramPacket(msg_send, msg_send.length, DA, port);

              ds.send(dp);

          }

          catch(Exception e)

          {

              System.out.println("Exception " + e);

          }

     }

}

             

             

             

             

             

             

             

             

                           

             

             

             

             

Client Server Communication - TCP / IP Sockets

// Socket Programing

// Client Server Communication

// Server Program

import java.io.*;

import java.net.*;

import java.util.*;

public class Server

{

     Server()

     {

     }   

    

     public void run() throws IOException

     {

        try

          {

              // Creating Server Socket

              ServerSocket ss = new ServerSocket(1500,10);

             

              // Accepting Connection from Client at port 1500

              Socket conc = ss.accept();

                                     

              ObjectOutputStream out = new ObjectOutputStream(conc.getOutputStream());

              ObjectInputStream in = new ObjectInputStream(conc.getInputStream());

             

              // Reading data from client

              String Name = (String)in.readObject();

             

              // Creating response

              Date dt = new Date();

              String res = "Welcome " + Name + "\n";

               res = res.concat("Current date and time is " + dt);

             

              // Sending response

              out.writeObject(res);

          }                 

          catch(Exception e)

          {  

          }

          finally

          {

              in.close();

              out.close();

              ss.close();

          }

    }

    

    public static void main(String args[]) throws IOException

     {

        Server s = new Server();

          s.run();

     }

}

// Socket Programing

// Client Server Communication

// Client Program

import java.net.*;

import java.io.*;

public class Client

{  

     Client()

     {

     }

     public void run() throws IOException

     {

        try

          {

              // Creating Client socket at port 1500

              Socket cs = new Socket("localhost",1500);

         

              ObjectOutputStream out = new ObjectOutputStream(cs.getOutputStream());

              ObjectInputStream in = new ObjectInputStream(cs.getInputStream());

           

              // Reading input from Client and sending to Server

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

              System.out.print("Enter name : ");

              String Name = br.readLine().trim();

              out.writeObject(Name);

             

              // Reading and displaying response from server

              String res = (String)in.readObject();

              System.out.println(res);                          

          }            

          catch(Exception e)

          {

          }

          finally

          {       

              in.close();

              out.close();

              cs.close();

          }

     }

     public static void main(String args[]) throws IOException

     {

          Client c = new Client();

          c.run();

     }

}