Subversion Repositories programming

/*******************************************************************************
 * File: P3_Client.java
 * Author: Ira W. Snyder (devel@irasnyder.com)
 * License: GNU General Public License v2
 * Class: CS380 - Computer Networking
 *
 * Assignment: Project #3
 * Date Last Modified: 2006-02-15
 *
 * Purpose: Implement a client that will request an IP Address from the
 * P3_Server running on TCP Port 1337. Once it gets a lease, it waits for
 * the server to tell it that the lease has expired.
 ******************************************************************************/

import java.net.*;
import java.io.*;

public class P3_Client
{
    /* Instance Variables */
    private static IPAddr ip;
    private static String hw;

    private static final String hostName = "localhost";
    private static final int portNumber = 1337;

    /**
     * Method: main
     * Purpose: The main() function, which handles requesting an IP Address,
     * and then closes when the lease expires.
     */
    public static void main (String[] args) throws Exception
    {
        Socket socket = null;
        PrintWriter out = null;
        BufferedReader in = null;
        BufferedReader kbd = null;
        String s = new String();
        boolean running = true;

        // Set up the socket, and input and output streams
        try
        {
            socket = new Socket (hostName, portNumber);
            out = new PrintWriter (socket.getOutputStream(), true);
            in = new BufferedReader (new InputStreamReader (
                                         socket.getInputStream()));
            kbd = new BufferedReader (new InputStreamReader (System.in));
        }
        catch (UnknownHostException e)
        {
            System.err.printf ("Can't resolve hostname: %s\n", hostName);
            System.exit (1);
        }
        catch (IOException e)
        {
            System.err.printf ("Couldn't get I/O for the connection to: %s\n", hostName);
            System.err.printf ("Is the P3_Server running?\n");
            System.exit (2);
        }

        // Ask the user for the Hardware Address
        System.out.print ("Please type your Hardware Address: ");
        hw = kbd.readLine();

        // Send Hardware Address to the server
        out.printf ("req IP %s\n", hw);

        // Print every message sent back from the server, until the lease expires
        while (running)
        {
            // Get messages from the server
            s = in.readLine();
            System.out.println (s);

            // Stop when the lease expires
            if (s.equals("IP Lease Time Expired"))
                running = false;
        }

        // Tell the user that we are quitting
        System.out.println ("Client Exiting");

        // Clean up all the sockets
        out.close();
        in.close();
        socket.close();
    }
}