Question

Create a simple messaging program application using Java. You can use sockets, ip addresses, etc.

Answer 1

CLIENT SIDE.

import java.io.*;
import java.net.*;
public class Chat
{
public static void main(String[] args) throws Exception
{
     Socket s = new Socket("127.0.0.1", 3000);
                               // reading from keyboard
     BufferedReader keyRead = new BufferedReader(new InputStreamReader(System.in));
                              // sending to client
     OutputStream ostream = s.getOutputStream();
     PrintWriter p = new PrintWriter(ostream, true);
                              // receiving from server
     InputStream istream = s.getInputStream();
     BufferedReader receiveRead = new BufferedReader(new InputStreamReader(istream));

     System.out.println("Start chat, type and press Enter key");

     String receiveM, sendM;             
     while(true)
     {
        sendM = keyRead.readLine(); // keyboard reading
        p.println(sendM);       // sending to server
        p.flush();                  
        if((receiveM = receiveRead.readLine()) != null) //receive from server
        {
            System.out.println(receiveM); // displaying at DOS
        }       
      }             
    }                  
}

server side

import java.io.*;
import java.net.*;
public class ChatS
{
public static void main(String[] args) throws Exception
{
      ServerSocket ss = new ServerSocket(3000);
      System.out.println("Server ready for chatting");
      Socket s = ss.accept( );                        
                              // reading from keyboard
      BufferedReader keyRead = new BufferedReader(new InputStreamReader(System.in));
                          // sending to client
      OutputStream ostream = s.getOutputStream();
      PrintWriter p = new PrintWriter(ostream, true);

                              // receiving from server
      InputStream istream = s.getInputStream();
      BufferedReader receiveRead = new BufferedReader(new InputStreamReader(istream));

      String receiveM, sendM;             
      while(true)
      {
        if((receiveM = receiveRead.readLine()) != null)
        {
           System.out.println(receiveM);       
        }       
        sendM = keyRead.readLine();
        p.println(sendM);           
        p.flush();
      }             
    }                  
}