Advanced Java Programming - Old Questions

9. Write Java programs using TCP sockets that communicate with each other in a computer network.

//Server.java 

import java.io.*; 

import java.net.*; 

public class Server

{ 

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

 { 

  try 

 { 

  System.out.println("SERVER:......\\n"); 

  ServerSocket s = new ServerSocket(95); 

  System.out.println("Server Waiting For The Client"); 

  Socket cs=s.accept(); 

  System.out.println("Client connected”); 

  BufferedReader in=new BufferedReader(new InputStreamReader(cs.getInputStream())); 

  PrintWriter out=new PrintWriter(cs.getOutputStream(),true); 

  while(true)

  { 

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

    System.out.print("To Client:"); 

    String tocl=din.readLine(); 

    out.println(tocl); 

    String st=in.readLine(); 

    if(st.equalsIgnoreCase("Bye")||st==null)break; 

    System.out.println("From Client:"+st); 

  }

 in.close(); 

 out.close(); 

 cs.close(); 

} 

catch(IOException e) { } 

 } 

}

import java.io.*; 

import java.net.*; 

public class Client 

{ 

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

  { 

   try

  { 

    System.out.println("CLIENT:......\\n"); 

    Socket con=new Socket("localhost", 95); 

    BufferedReader in=new BufferedReader(new InputStreamReader(con.getInputStream())); 

    PrintWriter out=new PrintWriter(con.getOutputStream(),true); 

    while(true) 

   { 

     String s1=in.readLine(); 

     System.out.println("From Server:"+s1); 

     System.out.print("Enter the messages to the server:"); 

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

     String st=din.readLine(); 

     out.println(st); 

     if(st.equalsIgnoreCase("Bye")||st==null)break; 

   } 

  in.close(); 

  out.close(); 

  con.close(); 

} 

 catch(UnknownHostException e){ } 

} 

}