A Simple Client-Server Model Implementation

Here is a simple implementation of client-server using Java. There are two java files, one for client code and one for server code. The code is quite self-explanatory.

FactorialClient.java

Code:

 /*
 **    A TCP based client that will send the number entered by the user for factorial
 **    calculation to a server
 **    @author: Tanaz Kerawala
 **    @author: S Pradeep
 **    @date: 5/29/2007
 */
 
 import java.io.*;
 import java.net.*;
 
 class FactorialClient
 {
     public static void main(String arg[])
     {
         int port=9999;
         Socket s;
         String msg="";
         try
         {
             BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
             InetAddress addr=InetAddress.getByName(null);
             s=new Socket(addr,port);
             OutputStreamWriter osw=new OutputStreamWriter(s.getOutputStream());
             PrintWriter pw=new PrintWriter(osw);
             BufferedReader br1=new BufferedReader(new InputStreamReader(s.getInputStream()));
             System.out.print("Enter a Number :  ");
             String str=br.readLine();
 
             pw.println(str);
             pw.flush();
             msg=br1.readLine();
             System.out.println("Answer from server : ");
             System.out.println(msg);
         }
         catch(Exception e)
         {    
             // Ignore
         }
     }
 }
 

FactorialServer.java

Code:

 /*
 **    A TCP based server that will calculate the factorial for client.
 **    @author: Tanaz Kerawala
 **    @author: S Pradeep
 **    @date: 5/29/2007
 */
 
 import java.io.*;
 import java.net.*;
 
 class FactorialServer implements Runnable
 {
     Socket s;
     int id;
     public static void main(String arg[])
     {
          int port=9999,count=0;
         try
         {
             // create new socket    
             ServerSocket ss=new ServerSocket(port);
             System.out.println("Waiting for client");
             while(true)
             { 
                 Socket s=ss.accept();
                 FactorialServer serve=new FactorialServer(s,count);
                 // launch new thread
                 Thread t=new Thread(serve);
                 t.start();
             }
         }
         catch(Exception e)
         {    
             // Ignore error
             System.out.println("Error");
         }
     }
 
 
     FactorialServer(Socket s,int id)
     {
         this.s = s;
         this.id = id;
     }
     
     public void run()
     {
         try
         {
             BufferedReader br=new BufferedReader(new InputStreamReader(s.getInputStream()));
             PrintWriter pw=new PrintWriter(new OutputStreamWriter(s.getOutputStream())) ;
             String str=br.readLine();
             int n=Integer.parseInt(str);
             int i;
             long f=1;
             System.out.println("Number sent by client: " + n);
             for(i = 2; i <= n; i++)
                 f = f * i;
             pw.println("Factorial is : "+f);                            
             pw.flush();
         }
         catch(Exception e)
         {    
             // Ignore error
             System.out.println("Thread: Error");
         }
     }
 }
 

 

Thanks ,,
Good work

 

Thank..
Its a very nice program...

 

Client server chatting software is based in socket programming. Its a very interesting programming but more complected.