jsp+servlet实现猜数字游戏

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);
}