jsp登录会话的简单实现

%@ 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>登录界面/title>
/head>
body>

form action="test_session2.jsp" method="post"> 
table width="300" height="300" border="0" align="center">
  tr height="80" align="center">
    td colspan="2">font size="24">OO登录/font>/td>/tr>
  tr height="30">
    td width="80" align="right">用户名：/td>             
    td>input type="text" name="name">/td>/tr>
  tr height="30">
    td width="80" align="right"> 密nbsp;nbsp;码：/td>
    td> input type="password" name="password">/td>/tr>
    tr>td height="40" align="center" colspan="2">
    input type="submit" value="登录">/td>/tr>
 /table>


/body>
/html>

%@ 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>登录成功/title>
/head>
body>
% 
String name = new String( request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");
session.setAttribute("name", name);

out.println(name + "成功登陆");
%>
a href="test_session3.jsp">br>跳转/a>
/body>
/html>

%@ 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>会话/title>
/head>
body>
%
String str = "";
Object obj = session.getAttribute("name");
if(obj != null){
  str = obj.toString();
  out.println(str + "已经成功登陆");
}else{
  out.println("会话超时，请重新登录。");
}
%>
/body>
/html>