AIM: Write a java 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 numbers and the result produced by the server is the addition of
that numbers
Client program:
import
java.io.*;
import
java.net.*;
public
class AddClient
{
public static void main(String
args[])
{
Socket addSocket = null;
DataOutputStream
strmToServer = null;
DataInputStream
strmFromServer = null;
final String server =
"localhost";
int i, currentSum, num;
try
{
addSocket =
new Socket(server, 8000);
strmToServer
= new DataOutputStream(addSocket.getOutputStream());
strmFromServer
= new DataInputStream(addSocket.getInputStream());
System.out.println("Connected
to Server ...");
}
catch
(UnknownHostException ex)
{
System.out.println("Unable
to find server: " + server);
System.exit(1);
}
catch (IOException ex)
{
System.out.println("Unable
to open I/O stream to server: " + server);
System.exit(1);
}
try
{
strmToServer.writeInt(args.length-1);
currentSum =
Integer.parseInt(args[0]);
for (i=1;
i<args.length; i++)
{
num
= Integer.parseInt(args[i]);
strmToServer.writeInt(currentSum);
strmToServer.writeInt(num);
currentSum
= strmFromServer.readInt();
}
System.out.println("Sum:
" + currentSum);
strmFromServer.close();
strmToServer.close();
addSocket.close();
}
catch
(Exception ex)
{
ex.printStackTrace();
}
}
}
Server program:
import
java.net.*;
import
java.io.*;
public
class AddServer
{
public static void main(String
args[])
{
Socket socket = null;
ServerSocket
serverSocket = null;
DataOutputStream
strmToClient = null;
DataInputStream
strmFromClient = null;
int i, numAdditions,
sum, num1, num2;
try
{
serverSocket
= new ServerSocket(8000);
System.out.println("Server
is starting ...");
}
catch (Exception ex)
{
System.out.println("Unable
to start server");
System.exit(1);
}
try
{
while (true)
{
socket
= serverSocket.accept();
System.out.println("Serving
client: " + socket.getInetAddress());
strmToClient
= new DataOutputStream(socket.getOutputStream());
strmFromClient
= new DataInputStream(socket.getInputStream());
numAdditions
= strmFromClient.readInt();
for
(i=0; i<numAdditions; i++)
{
num1
= strmFromClient.readInt();
num2
= strmFromClient.readInt();
System.out.println(num1
+ " + " + num2);
sum
= num1 + num2;
strmToClient.writeInt(sum);
}
socket.close();
}
}
catch (IOException ex)
{
System.out.println("Unable
to open I/O stream to server: " + ex);
System.exit(1);
}
}
}
Output:
