GuessServlet.java

package com.rlovep.exec;

import java.io.IOException;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class GuessServlet
 */

public class GuessServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
	//产生一个幸运数字
		int answer;
		
		/**
		 * 新游戏方法。产生一个新的幸运数字
		 */
		public void newGame(){
			Random random = new Random();
			answer = random.nextInt(30);
		}
    /**
     * @see HttpServlet#HttpServlet()
     */
    public GuessServlet() {
    	newGame();
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	response.setContentType("text/html;charset=utf-8");
		
		//1.接收输入的数字
		String lucyNoStr = request.getParameter("lucyNo");
		System.out.println("答案："+answer);
		Integer lucyNo = null;
		//2.判断幸运数字和用户的数字
		//2.1 把用户输入的数字转成整数
		if(lucyNoStr!=null || !lucyNoStr.equals("")){
			lucyNo = Integer.parseInt(lucyNoStr);
		}
		
		
		//标记记录当前竞猜的次数
		Integer times = 1;//初始值
		
		//接收客户当前竞猜次数
		String timesStr = request.getParameter("times");
		if(timesStr!=null && !timesStr.equals("")){
			times = Integer.parseInt(timesStr)+1;
		}
		
		
		if(times<5){
			String msg = "";
			//比较
			if(lucyNo>answer){
				//大了
				msg = "可惜，大了点";
			}else if(lucyNo<answer){
				//小了
				msg = "可惜，小了点";
			}else if(lucyNo==answer){
				//等于,中奖
				msg = "恭喜你，中得1000000元现金大奖,请带身份证到xxx地方领奖！";
				times = null;
			}
			//把当前竞猜的次数放入域对象
			request.setAttribute("times", times);
			//把信息放入域对象中
			request.setAttribute("msg", msg);
		}else{
			//产生新的幸运数字
			newGame();
			//游戏结束
			response.getWriter().write("游戏结束。<a href='"+request.getContextPath()+"/guess.jsp'>再来一盘</a>");
			return;
		}
		//转发
		request.getRequestDispatcher("/guess.jsp").forward(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}