jsp登录会话

 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>登录界面</title>
 8 </head>
 9 <body>
10 
11 <form action="test_session2.jsp" method="post"> 
12 <table width="300" height="300" border="0" align="center">
13    <tr height="80" align="center">
14        <td colspan="2"><font size="24">OO登录</font></td></tr>
15    <tr height="30">
16        <td width="80" align="right">用户名：</td>                          
17        <td><input type="text" name="name"></td></tr>
18    <tr height="30">
19        <td width="80" align="right"> 密&nbsp;&nbsp;码：</td>
20        <td> <input type="password" name="password"></td></tr>
21        <tr><td height="40" align="center" colspan="2">
22        <input type="submit" value="登录"></td></tr>
23  </table>
24 
25 
26 </body>
27 </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>登录成功</title>
 8 </head>
 9 <body>
10 <% 
11 String name = new String( request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");
12 session.setAttribute("name", name);
13 
14 out.println(name + "成功登陆");
15 %>
16 <a href="test_session3.jsp"><br>跳转</a>
17 </body>
18 </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>会话</title>
 8 </head>
 9 <body>
10 <%
11 String str = "";
12 Object obj = session.getAttribute("name");
13 if(obj != null){
14     str = obj.toString();
15     out.println(str + "已经成功登陆");
16 }else{
17     out.println("会话超时，请重新登录。");
18 }
19 %>
20 </body>
21 </html>