Study of Network Programming. Write a simple client-server java program. The client sends radius of circle to the server. The server replies back with area of circle. GTU

Program:-

Server.java

import java.util.*;

import java.io.*;

import java.net.*;

class server

{

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

            {

                        System.out.println("\nServer Started.\n");

                        Scanner in=new Scanner(System.in);

           

                        ServerSocket s=new ServerSocket(8888);

                        System.out.println("\nWaiting For Client.\n");

                        Socket s1=s.accept();

                        System.out.println("\nClient Connected.\n");

           

                        DataInputStream din=new DataInputStream(s1.getInputStream());

                        DataOutputStream dout=new DataOutputStream(s1.getOutputStream());

                       

                        String msg="start";

           

                        while(!msg.equals("stop"))

                        {

                                    String r = (String) din.readUTF();

                                    double rad = Double.parseDouble(r);

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

                                    double area = Math.PI*rad*rad;

                                    dout.writeUTF(Double.toString(area));

                        }

                        s.close();

            }

}

client.java

import java.util.*;

import java.io.*;

import java.net.*;

class client

{

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

            {

                        System.out.println("\nClient Started.\n");

                        Scanner in=new Scanner(System.in);

                        Socket s=new Socket("localhost",8888);

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

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

                        String msg="start";

                       

                        while(!msg.equals("stop"))

                        {

                                    System.out.print("Client: Enter Radius: ");

                                    String rad=in.nextLine();

                                    dout.writeUTF(rad);

                                   

                                    rad=(String) din.readUTF();

                                    System.out.println("Server: Area of circle is:"+rad);

                        }

                        s.close();

            }

}