【使用JSP技术实现猜数字游戏】
设计一个web app，有一个随机数字，给5次机会让客户猜测这个数字：
1）如果客户猜的数字比产生的数字值大，则提示“可惜，大了点”。
2）如果客户猜的数字比产生的数字值小，则提示“可惜，小了点”
猜对了给出相对应的提示
对于应的代码
首先是jsp页面（主要是处理逻辑）
<%@page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>猜数字游戏</title>
</head>
<body>
<%
String value=(String)request.getAttribute("answer");
Integer times = (Integer)request.getAttribute("times");
%>
<i><h1>请猜猜这个数字</h1>
<hr>
<form action="<%=request.getContextPath()%>/GuessServlet" method="post">
<input type="text" name="number"> <input type="submit"
value="确定">
<%
if(times!=null){
%>
<input type="hidden" name="times" value="<%=times %>" />
<%
if(value.equals("=")){
out.print("<p style='color:green'>啦啦啦，恭喜你答对啦，");
}else{
out.print("<p style='color:red'>你还有"+(5-times)+"次机会！同时你猜的有点"+value);
}
%></p>
<%
}
%>
</form> </i>
</body>
</html>
然后就是servlet的代码：
package com.gqx.work;
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;
public class GuessServlet extends HttpServlet {
/**
* 产生一个随机的数字（666），给5次机会让客户猜测这个数字
*/
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
String num=request.getParameter("number");
Integer time=1;
String times=request.getParameter("times");
String value="";
int key;
System.out.println(times);
if (times !=null && !times.equals("")) {
time=Integer.parseInt(times)+1;
}
if (num=="" || num==null) {
value="请填入数字";
}else {
key=Integer.parseInt(num);
if (key==666) {
value="=";
}else if (key>666) {
value="大";
}else {
value="小";
}
request.setAttribute("answer", value);
}
if (time>4) {
response.getWriter().write("游戏结束，<a href='"+request.getContextPath()+"/work1/guess.jsp'>再来一局</a>");
return;
}
request.setAttribute("times", time);
request.getRequestDispatcher("work1/guess.jsp").forward(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
运行的截图;
