/* * File: NimServlet.java * Author: Java, Java, Java * Description: A servlet version of NimServer that plays the game of Nim. */ import java.io.*; import java.util.*; import javax.servlet.*; import javax.servlet.http.*; public class NimServlet extends HttpServlet { private OneRowNim nim = null; private NimPlayer nimPlayer = null; public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); HttpSession session = request.getSession(true); out.println(""); out.println(""); out.println(""); out.println("Simple Nim Game"); out.println(""); out.println(""); out.println("

One Row Nim

"); out.println("

The Rules

"); out.println("A random number of pennies is thrown on the table.
"); out.println("Two players alternate making moves,
"); out.println("picking up between 1 and 3 pennies on each move.
"); out.println("The player who picks up the last penny loses.

"); if (nim == null) { nim = new OneRowNim(7 + (int)(Math.random() * 11)); nimPlayer = new NimPlayer(nim); out.println("

You go first!

"); } else { int userTakes = Integer.parseInt(request.getParameter("pickup")); if (!nim.takeSticks(userTakes)) { out.println("

Woops. That's an illegal move!. Try again.

"); } else if (!nim.gameOver()) { nim.changePlayer(); out.println("

So, you took " + userTakes + "
"); out.println("That leaves me with " + nim.getSticks() + "
"); int iTake = nimPlayer.move(); out.println("OK. I take " + iTake + " pennies.

"); nim.takeSticks(iTake); nim.changePlayer(); } } if (!nim.gameOver()) { if (nim.getPlayer() == 1) out.println("

Who's Turn: Your turn

"); else out.println("

Who's Turn: My turn

"); out.println("

Pennies Left: " + nim.getSticks() + "

"); out.println("
"); for (int k=0; k < nim.getSticks(); k++) out.println(""); // out.println(""); out.println("

"); out.println("
"); out.println("
"); out.println(""); out.println(""); out.println("
How many do you pickup?:
"); out.println("
"); out.println(""); } else { out.println("

Game over!

"); if (nim.getPlayer() == 1) out.println("

And the winner is : Me.

"); else out.println("

And the winner is: You.

"); out.println("

Nice game!

"); out.println("

To play again, just reload the page.

"); nim = null; } out.println(""); out.println(""); } /** * We are going to perform the same operations for POST requests * as for GET methods, so this method just sends the request to * the doGet method. */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doGet(request, response); } } // NimServlet