Program to Chat between Client & Server in Java

     This program enables us to chat between the client and server. This is a bidirectional data transfer.

Client

import java.io.*;

import java.net.*;

import java.util.*;

class Client

{

            public static void main(String arghs[])

            {

                        try

                        {

                                    Socket clientskt=new Socket("127.0.0.1",1024);

                                    while(true)

                                    {

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

                                   

                                    DataInputStream din=new DataInputStream(clientskt.getInputStream());

                                    DataOutputStream dout=new DataOutputStream(clientskt.getOutputStream());

                                    System.out.print("You have to type:");

                                    String str=in.readLine();

                                    dout.writeBytes(str+"\n");

                                    if(str.equals("bye"))

                                    {

                                                break;

                                    }

                                    String str1=din.readLine();

                                    System.out.println("Server:"+str1);

                                    if(str1.equals("bye"))

                                    {

                                                break;

                                    }

                                    }

                                    clientskt.close();

                                   

                        }

                        catch(Exception e)

                        {

                                    System.out.println(e);

                        }

            }

}

SERVER

import java.io.*;

import java.net.*;

import java.util.*;

class Server

{

            public static void main(String args[])

            {

            try

            {

                        ServerSocket sock=new ServerSocket(1024);

                        Socket clientskt=sock.accept();

                        while(true)

                        {         

                                   

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

                                    DataInputStream din=new DataInputStream(clientskt.getInputStream());

                                    DataOutputStream dout=new DataOutputStream(clientskt.getOutputStream());

                                    String str1=din.readLine();

                                    System.out.println("Client:"+str1);

                                    if(str1.equals("bye"))

                                    {

                                                break;

                                    }

                                    System.out.print("You have to type:");

                                    String str=in.readLine();

                                    dout.writeBytes(str+'\n');

                                    if(str.equals("bye"))

                                    {

                                                break;

                                    }

                                                                       

                        }

                        sock.close();

                       

            }

            catch(Exception e)

            {

                        System.out.println(e);

                        }

            }

}   

Output

E:\java>javac Server.java

E:\java>java Client

E:\java>java Client

You have to type:hai

Server:hello

You have to type:how r u

Server:fine u?

You have to type:fine

Server:r u free?

You have to type:bye

E:\java>java Server

Client:hai

You have to type:hello

Client:how r u

You have to type:fine u?

Client:fine

You have to type:r u free?

Client:bye