用servlet实现一个简单的猜数字游戏。

需要两个页面，一个jsp页面（guess.jsp）和servlet页面（servlet）。

一.jsp页面

在jsp页面中需要实现：

1.创建随机数并且保存在session中。

2.做个form表单提交猜的数字给servlet页面。

java 复制代码

<%@page import="java.util.Random"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="servlet" method="post">
<%
Random random=new Random();
int RN=random.nextInt(100)+1;
session.setAttribute("RN", RN);
%>
有一个1~100的数字，尝试猜到它。<br>
输入你猜的数字：<input type="text" name="gn"><br>
<input type="submit"value="提交">
</form>
</body>
</html>

二.servlet页面

1.获取传来的数字，注意类型转换。

2.比较大小，打印出表单再猜或者猜中结果。

java 复制代码

package lh.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
/**
 * Servlet implementation class servlet
 */
@WebServlet("/servlet")
public class servlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public servlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
				int guessnumber=Integer.parseInt(request.getParameter("gn"));
				HttpSession session=request.getSession();
				int RN=(Integer)session.getAttribute("RN");
				response.setContentType("text/html; charset=UTF-8");
				PrintWriter out=response.getWriter();
				if(guessnumber==RN)
				{
					out.print("恭喜猜对，随机数为："+RN);
				}else if(guessnumber>RN)
				{
					out.print("猜大了。");
					out.print("<form action='servlet' method='post'>");
					out.print("输入你猜的数字：<input type='text'name='gn'>");
					out.print("<input type='submit'value='提交'>");
					out.print("</form");
				}
				else{
					out.print("猜小了。");
					out.print("<form action='servlet' method='post'>");
					out.print("输入你猜的数字：<input type='text'name='gn'>");
					out.print("<input type='submit'value='提交'>");
					out.print("</form");
				}

		}

}

运行结果：