JSP Session. Getattribute () method: get the attribute value according to the attribute name
•
Java
getAttribute(String name)
Example
<%
session.getAttribute("user");
%>
Typical application
<form name="form1" method="post" action=""> 用户名:<input name="name" type="text" id="name" style="width:120px"><br> 密＆nbsp;＆nbsp;码:<input name="pwd" type="password" id="pwd" style="width:120px"><br> <br> <input type=" submit" name="Submit" value="提交"> </form>
<%@page language="java" contentType="text/html;charset=GB18030" pageEncoding="GB18030"%>
<%@page import = "java.util.*"%>
<%
String[][] userList = {{"mr","mrsoft"},{"wgh","111"},{"sk","111"}}; //定义一个保存用户列表的二维数组
boolean flag = false; //登录状态
request.setCharacterEncoding("GB18030"); //设置编码
String username = request.getParameter("username"); //获取用户名
String pwd = request.getParameter("pwd"); //获取密码
for(int i=0;i<userList.length;i++){ //遍历二维数组
if(userList[i][0].equals(username)){ //判断用户名
if(userList[i][1].equals(pwd)){ //判断密码
flag = true; //表示登录成功
break; //跳出for循环
}
}
}
if(flag){ //如果值为true，表示登录成功
session.setAttribute("username",username); //保存用户名到session范围的变量
response.sendRedirect("main.jsp"); //跳转到主页
}else{
response.sendRedirect("index.jsp"); //跳转到用户登录页面
}
%>
<%@page language="java" contentType="text/html;charset=GB18030"pageEncoding="GB18030"%>
<%
String username = (String)session.getAttribute("username"); //获取保存在session范围内的用户名
%>
<html>
<head>
<Meta http-equiv="Content-Type" content="text/html;charset=GB18030">
<title>系统主页</title>
</head>
<body>
您好！[<%=username%>]欢迎您访问！<br>
<a href="https://www.jb51.ccexit.jsp">[退出]</a>
</body>
</html>
编写 exit.jsp 文件，在该文件中销毁 session，并重定向页面到 index.jsp 页面。exit.jsp 文件的具体代码如下：
<%@page language="java" contentType="text/html;charset=GB18030" pageEncoding="GB18030"%>
<%
session.invalidate(); //销毁session
response.sendRedirect("index.jsp"); //重定向页面到index.jsp
%>
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