11.client_server application

Write a Java program that implements a simple client/server application. The client sends data to a server.

The server receives the data, uses it to produce a result, and then sends the result back to the client. The client displays the result on the console. For ex: The data sent from the client is the radius of a circle, and the result produced by the server is the area of the circle. (Use java.net). server.java

import java.net.*;

import java.io.*;

public class server

{

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

{

ServerSocket ss=new ServerSocket(2000);

Socket s=ss.accept();

BufferedReader br=new BufferedReader

(new InputStreamReader(s.getInputStream()));

double rad,area;

String result;

rad=Double.parseDouble(br.readLine());

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

area=Math.PI*rad*rad;

result="Area is "+area;

PrintStream ps=new PrintStream(s.getOutputStream());

ps.println(result);

br.close();

ps.close();

s.close();

ss.close();

}

}

Client.java

import java.net.*;

import java.io.*;

public class client

{

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

{

Socket s=new Socket("localhost",2000);

BufferedReader br=new

BufferedReader(new InputStreamReader(System.in));

String rad;

System.out.println("Enter radius of the circle ");

rad=br.readLine();

PrintStream ps=new PrintStream(s.getOutputStream());

ps.println(rad);

BufferedReader fs=new

BufferedReader(new InputStreamReader

(s.getInputStream()));

String result=fs.readLine();

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

br.close();

fs.close();

ps.close();

s.close();

}

}