JSP学习案例--,竞猜游戏 

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head> 
    <title>百万富翁数字竞猜游戏</title>  
  </head>
  
  <body>
      <%
          //从request域中取出信息
          String msg = (String)request.getAttribute("msg");
          if(msg!=null){
              out.write("<font color='red'>"+msg+"</font>");
          }
       %>
       <%
           //获取竞猜次数
           Integer times = (Integer)request.getAttribute("times");
           if(times!=null){
               out.write(",你还有"+(5-times)+"次机会！");
           }
        %>
        
    <form action="/GuessServlet" method="post">
        请输入30以下的整数：<input type="text" name="lucyNo"/><br/>
        <%
            if(times!=null){
         %>
        <input type="hidden" name="times" value="<%=times %>"/>
        <%
        }
         %>
        <input type="submit" value="开始竞猜"/>
    </form>
  </body>
</html>
package com.loaderman.demo;

import javax.servlet.ServletException;
import javax.servlet.http.*;
import java.io.IOException;
import java.util.Random;


public class TestServlet extends HttpServlet {

    //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);
    }

    public TestServlet(){
        //第一次访问
        newGame();
    }


    public 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("/05.guess.jsp").forward(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }
}

 

posted on 2018-11-22 14:48  LoaderMan  阅读(287)  评论(0)  编辑  收藏  举报

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