制作一个有条理的登录系统（练习） 

 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 <%
11 session.invalidate();
12 %>
13 <form action="index2.jsp" method="post">
14     账号：<input type="text" name="un" >
15     <br>
16     密码：<input type="password" name="pw">
17     <br>
18     <input type="submit" value="登录">
19 </form>
20 </body>
21 </html>
 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 <%
11 String un=request.getParameter("un");
12 String pw=request.getParameter("pw");
13 if(un!=null&&pw!=null)
14 {    
15     if(un.equals("tom")&&pw.equals("123456"))
16     {
17         session.setAttribute("un", un);
18         session.setMaxInactiveInterval(20);
19         out.print("登录成功......");
20         response.setHeader("refresh", "1;URL=index3.jsp");    
21     }
22     else
23     {
24         out.print("账号或密码错误！请重新登录......");
25         response.setHeader("refresh", "1;URL=index1.jsp");
26     }
27 }
28 else
29 {
30     response.sendRedirect("index1.jsp");
31 }
32 %>
33 </body>
34 </html>
 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 <%
11 Object un=session.getAttribute("un");
12 if(un!=null)
13 {
14     out.print("欢迎: "+un.toString());
15 }
16 else
17 {
18     out.print("会话超时！请先登录......");
19     response.setHeader("refresh", "1;URL=index1.jsp");
20 }
21 %>
22 <br>
23 <a href="index1.jsp">退出登录</a>
24 </body>
25 </html>

 

posted @ 2016-06-28 22:12  明天会更好！！！！  阅读(135)  评论(0)    收藏  举报