cookie之三天免登录代码 

LoginCookie.java

 1 package com.bjsxt.cookie;
 2 
 3 import java.io.IOException;
 4 import java.net.URLDecoder;
 5 import java.net.URLEncoder;
 6 
 7 import javax.servlet.ServletException;
 8 import javax.servlet.annotation.WebServlet;
 9 import javax.servlet.http.Cookie;
10 import javax.servlet.http.HttpServlet;
11 import javax.servlet.http.HttpServletRequest;
12 import javax.servlet.http.HttpServletResponse;
13 
14 /**
15  * Servlet implementation class LoginCookie
16  */
17 @WebServlet("/LoginCookie")
18 public class LoginCookie extends HttpServlet {
19 
20     @Override
21     protected void service(HttpServletRequest req, HttpServletResponse resp)
22             throws ServletException, IOException {
23         System.out.println("LoginCookie.service()");
24         
25         //处理中文乱码
26         req.setCharacterEncoding("utf-8");
27         resp.setCharacterEncoding("utf-8");
28         resp.setContentType("text/html;charset=utf-8");
29         
30         //获取请求参数
31         String name=req.getParameter("uname");
32         String pwd=req.getParameter("pwd");
33         String check=req.getParameter("che");
34         
35         //处理业务
36         //1:判断是否选择三天免登录
37         if(check!=null&&"yes".equals(check)){
38             //判断用户名和密码是否为空
39             if((name!=null&&!"".equals(name))&&(pwd!=null&&!"".equals(pwd))){
40             //设置cookie，保存在客户端的硬盘中
41                 
42             Cookie cookiename=new Cookie("cookiename",URLEncoder.encode(name,"utf-8"));
43             Cookie cookiepwd=new Cookie("cookiename",URLEncoder.encode(pwd,"utf-8"));
44             System.out.println("LoginCookie.service(存储cookie)");
45             //设置cookie的有效期
46             cookiename.setMaxAge(3*24*3600);
47             cookiepwd.setMaxAge(3*24*3600);
48             
49             //设置访问路径
50             cookiename.setPath(req.getContextPath()+"/LoginCookie");
51             cookiepwd.setPath(req.getContextPath()+"/LoginCookie");
52             
53             //发送给浏览器客户端
54             resp.addCookie(cookiename);
55             resp.addCookie(cookiepwd);
56         }
57         
58         //如果用户名和密码为空，从客户端硬盘中读取cookie
59         if((name==null||"".equals(name))||(pwd==null||"".equals(pwd))){
60             //读取cookie
61         Cookie[] cookies=req.getCookies();
62         //过滤出用户名和密码
63         if(cookies!=null&&cookies.length>0){
64             for(int i=0;i<cookies.length;i++){
65                 //取出用户名
66                 if("cookiename".equals(cookies[i].getName())){
67                     //pwd=cookies[i].getValue();
68                     name=URLDecoder.decode(cookies[i].getValue(),"utf-8");
69                 }
70                 //取出密码
71                 if("cookiepwd".equals(cookies[i].getName())){
72                     pwd=URLDecoder.decode(cookies[i].getValue(),"utf-8");
73                 }
74             }
75         }
76         //打印英户名和密码
77         System.out.println("LoginCookie.service()name:"+name+"---pwd"+pwd);
78         }
79         //4校验用户名和密码
80         if("张三".equals(name)&&"abc".equals(pwd)){
81             resp.getWriter().print("welcome"+name+"login success");
82         }else{
83             resp.getWriter().print("login false "+name+pwd);
84         }
85     }
86     }
87 }
index.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10   <form action="LoginCookie" method="post">
11   <table border="1" align="center">
12     <tr>
13     <th>用户名：</th>
14     <td><input type="text" name="uname" value=""></td>
15     </tr>
16     <tr>
17     <th>密码</th>
18     <td><input type="password" name="pwd" value=""></td>
19     </tr>
20     <tr>
21     <th colspan="2"><input type="checkbox" name="che" value="yes">三天免登录</th>
22     </tr>
23     <tr>
24     <th colspan="2"><input type="submit" value="登录"></th>
25     </tr>
26     </table>
27   </form>
28 </body>
29 </html>

 

posted @ 2018-12-28 16:07  wq9  阅读(1589)  评论(0)  编辑  收藏  举报