jsp+servlet实现猜数字游戏

来源：jb51　　时间：2019/6/28 10:18:43　　对本文有异议

jsp+servlet实现猜数字游戏主要用到了servlet方面的session，HttpServletResponse类中的sendRedirect()方法。

step1，客户访问或刷新getNumber.jsp页面时，随机给用户分配一个1-100之间的数字，将该数字存放到客户的session中。

<%@ page language="java" import="java.util.*" 
contentType="text/html;charset=utf-8"%>
<html>
 <head> 
 </head> 
 <body>
 <%
  String message=(String)session.getAttribute("message");
  %>
  <form action="HandleGuess" methods="post">
   <input type="text" name="guessnumber" size=8>
   <%=message %>
   <input type="submit" value="提交">
   </form>
   <form action="getNumber.jsp" method="post">
    <input type="submit" value="重新得到新的随机数">
   </form>
 </body>
</html>

step2，然后用户超廉价到inputNumber.jsp页面上，用户输入自己的猜测，并提交给HandleGuess类负责创建。

<%@ page language="java" import="java.util.*" pageEncoding="utf-8" 
contentType="text/html;Charset=utf-8"%>
<html>
 <head>
 </head> 
 <body>
 <% session.setAttribute("message", "请您猜数");
 // HttpSession session =request.getSession(true);
 int randomNumber=(int)(Math.random()*100)+1;//获取一个随机数
 session.setAttribute("saveNumber",new Integer(randomNumber));
  %>
  <p>访问或刷新该页面可以随机跌倒一个1，到100之间的数字
  <br>单击下面链接可以访问去猜数字
  <a href="inputNumber.jsp" rel="external nofollow" >去猜数字</a>
 </body>
</html>

step3,该servlet类为：

import java.io.IOException;
import java.io.PrintWriter;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
 
public class HandleGuess extends HttpServlet { 
 public void doPost(HttpServletRequest request,HttpServletResponse response)
  throws ServletException,IOException{
 request.setCharacterEncoding("utf-8");
 response.setContentType("text/html;charset=utf-8");
 PrintWriter out=response.getWriter(); 
 //获取客户猜测提交的数
 int guessNumber=Integer.parseInt(request.getParameter("guessnumber"));
 //获取客户的会话对象
 HttpSession session=request.getSession();
 Integer integer=(Integer)session.getAttribute("saveNumber");
 int realNumber=integer.intValue();
 System.out.println(realNumber);
 System.out.println(guessNumber);
 if(guessNumber>realNumber){
  session.setAttribute("message", "您猜大了");
  System.out.println("您猜大了---no");
  response.sendRedirect("inputNumber.jsp");
 }
 else if(guessNumber<realNumber){
  session.setAttribute("message", "您猜小了");
  System.out.println("您猜小了---no");
  response.sendRedirect("inputNumber.jsp");
 }
 else{
  session.setAttribute("message", "您猜对了");
  System.out.println("您猜对了");
  response.sendRedirect("inputNumber.jsp");
 }
 }
 public void doGet(HttpServletRequest request,HttpServletResponse response)
   throws ServletException,IOException{
 doPost(request,response);
 }
 
}