Cookie实现免登录

时间 2019-12-01

标签 cookie 实现登录栏目 HTML 繁體版

原文原文链接

1.首先要有一个登陆界面：css

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 
 3 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 4 <html>
 5   <head>
 6     
 7     
 8     <title>My JSP '1-1.jsp' starting page</title>
 9     <%
10       String username = "";
11       String password = "";
12       //
13       Cookie[] cookies = request.getCookies();
14       for(int i=0 ; i<cookies.length;i++){
15           if("username".equals(cookies[i].getName())){
16                  username = cookies[i].getValue();
17           }
18           else if("password".equals(cookies[i].getName())){
19                  password = cookies[i].getValue();                            
20           }     
21       }
22       
23      %>
24     
25     
26     
27 
28   </head>
29   
30   <body>
31  
32        <form action="login_handler.jsp" method="post">
33        username:<input type="text" name="name" value="<%=username%>"/><br>
34        password:<input type="password"  name="pwd" value="<%=password%>"/><br>
35        <input type="checkbox" value="y" name="isLogin">自动登陆<br>
36        <input type="submit" value="登陆"/>
37        </form>
38  
39   </body>
40 </html>

2.在有一个后台来处理表单提交内容html

 1 <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
 2 
 3 
 4 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 5 <html>
 6   <head>
 7     
 8     <title>1-2.jsp</title>
 9    
10 
11   </head>
12   
13   <%
14      String name = request.getParameter("name");
15      String pwd = request.getParameter("pwd");
16      String flag = request.getParameter("isLogin");
17      
18      if(!"admin".equals(name)&&!"123".equals(pwd)){
19          response.sendRedirect("error.jsp");
20      }
21      else{
22          if("y".equals(flag)){
23             Cookie nameCookie =new Cookie("username",name);
24             nameCookie.setMaxAge(3600);
25             Cookie pwdCookie =new Cookie("password",pwd);
26             pwdCookie.setMaxAge(3600);
27             response.addCookie(nameCookie);
28             response.addCookie(pwdCookie);  
29          }
30          response.sendRedirect("sucess.jsp");
31      }
32          
33    %>
34   <body>
35    
36   </body>
37 </html>

若是选中自动登陆的话，之后登陆就能够进行自动登陆了~java

登陆成功画面:cookie

登陆失败画面：jsp

这是一个简单的输出Cookie值来检验cookie的存在~post

 1 <!--Cookie.jsp 这里能够任选哦~ -->
 2 <%@ page language="java" import="java.util.*"  pageEncoding="utf-8"%>
 3 <%request.setCharacterEncoding("utf-8"); %>
 4 
 5 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 6 <html>
 7   <head>
 8     
 9     <title>login-2.jsp</title>
10     
11 
12     <!--
13     <link rel="stylesheet" type="text/css" href="styles.css">
14     -->
15 
16   </head>
17   
18   <body>
19   <% 
20   Cookie c[] = request.getCookies();
21   for(int i=0;i<c.length;i++)
22   {
23     Cookie temp = c[i];
24   %>
25   <%=temp.getName() %>:<%=temp.getValue() %><br>
26   <%  
27   }
28   %> 
29   
30   
31   
32      <br>
33   </body>
34 </html>

获取到Cookie~spa