Answer / dinesh tiwari

//SERVER code///////////////////////////////
import java.io.*;
import java.net.*;
public class Provider{
ServerSocket providerSocket;
Socket connection = null;
ObjectOutputStream out;
ObjectInputStream in;
String message;
Provider(){}
void run()
{
try{
//1. creating a server socket
providerSocket = new ServerSocket
(2004, 10);
//2. Wait for connection
System.out.println("Waiting for
connection");
connection = providerSocket.accept
();
System.out.println("Connection
received from " + connection.getInetAddress().getHostName
());
//3. get Input and Output streams
out = new ObjectOutputStream
(connection.getOutputStream());
out.flush();
in = new ObjectInputStream
(connection.getInputStream());
sendMessage("Connection
successful");
//4. The two parts communicate via
the input and output streams
do{
try{
message = (String)
in.readObject();
System.out.println
("client>" + message);
if (message.equals
("bye"))
sendMessage
("bye");
}
catch
(ClassNotFoundException classnot){
System.err.println
("Data received in unknown format");
}
}while(!message.equals("bye"));
}
catch(IOException ioException){
ioException.printStackTrace();
}
finally{
//4: Closing connection
try{
in.close();
out.close();
providerSocket.close();
}
catch(IOException ioException){
ioException.printStackTrace
();
}
}
}
void sendMessage(String msg)
{
try{
out.writeObject(msg);
out.flush();
System.out.println("server>" + msg);
}
catch(IOException ioException){
ioException.printStackTrace();
}
}
public static void main(String args[])
{
Provider server = new Provider();
while(true){
server.run();
}
}
}

........................................................
CLIENT CODE
........................................................
import java.io.*;
import java.net.*;
public class Requester{
Socket requestSocket;
ObjectOutputStream out;
ObjectInputStream in;
String message;
Requester(){}
void run()
{
try{
//1. creating a socket to connect
to the server
requestSocket = new Socket
("localhost", 2004);
System.out.println("Connected to
localhost in port 2004");
//2. get Input and Output streams
out = new ObjectOutputStream
(requestSocket.getOutputStream());
out.flush();
in = new ObjectInputStream
(requestSocket.getInputStream());
//3: Communicating with the server
do{
try{
message = (String)
in.readObject();
System.out.println
("server>" + message);
sendMessage("Hi my
server");
message = "bye";
sendMessage
(message);
}
catch
(ClassNotFoundException classNot){
System.err.println
("data received in unknown format");
}
}while(!message.equals("bye"));
}
catch(UnknownHostException unknownHost){
System.err.println("You are trying
to connect to an unknown host!");
}
catch(IOException ioException){
ioException.printStackTrace();
}
finally{
//4: Closing connection
try{
in.close();
out.close();
requestSocket.close();
}
catch(IOException ioException){
ioException.printStackTrace
();
}
}
}
void sendMessage(String msg)
{
try{
out.writeObject(msg);
out.flush();
System.out.println("client>" + msg);
}
catch(IOException ioException){
ioException.printStackTrace();
}
}
public static void main(String args[])
{
Requester client = new Requester();
client.run();
}
}

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