Socket programing in java

create two file one for client and one for server

for client you will have to code like this



/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package jsocket;

/**
 *
 * @author jawadmahmood
 */

import java.net.*;
import java.io.*;
import javax.swing.*;

public class JSocket {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        try{
           
            Socket s = new Socket("localhost", 2222);
            InputStream is = s.getInputStream();
            InputStreamReader isr = new InputStreamReader(is);
            BufferedReader br = new BufferedReader(isr);
            OutputStream os = s.getOutputStream();
            PrintWriter pw = new PrintWriter(os, true);
            String msg = JOptionPane.showInputDialog("Enter your name");
            pw.println(msg);
            msg = br.readLine();
            JOptionPane.showMessageDialog(null, msg);
            s.close();
           
           
           
           
        }
        catch(Exception ex){
           
            System.out.println("The error is " + ex);
        }
    }
   
}

then create the server socket like this 

/*

 * To change this license header, choose License Headers in Project Properties.

 * To change this template file, choose Tools | Templates

 * and open the template in the editor.

 */

package echoserver;

/**

 *

 * @author jawadmahmood

 */

import java.net.*;

import java.io.*; 

import javax.swing.*;

public class EchoServer {

    /**

     * @param args the command line arguments

     */

    public static void main(String[] args) {

        // TODO code application logic here

        try{

             ServerSocket ss = new ServerSocket(2222);

             System.out.println("Server started");

             while(true){

             

                 Socket s = ss.accept();

                 System.out.println("Connection request received" ); 

                 InputStream is =s.getInputStream();

                 InputStreamReader isr = new InputStreamReader(is);

                 BufferedReader br = new BufferedReader(isr); 

                 OutputStream os = s.getOutputStream();

                 PrintWriter pw = new PrintWriter(os, true);

                 String name = br.readLine();

                String  msg =  "Hello "+name+ "from server";

                pw.println(msg);

                s.close();

                 

             

             }

             

             

             

        

        }catch(Exception ex){

        

            System.out.println(ex);

        }

    }

    

}

when you start the program it will open the input dialog box when you enter the name or something else it will return the text with hello in dialog box .

as shown in the pic