如题所述
第1个回答 2016-11-30
登录时判断session是否为空，为空的话则设置一个session，并进行登录操作：
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Login loginBean = null;
HttpSession session = request.getSession(true);
try {
loginBean = (Login) session.getAttribute("login");
if(loginBean == null){
loginBean = new Login();
session.setAttribute("login", loginBean);
}
} catch (Exception e) {
loginBean = new Login();
session.setAttribute("login", loginBean);
}
//下面是登录操作，并给loginBean这个javabean的各个参数赋值，省略
在其他页面里，通过判断先前设置的这个session是否为空，为空的话转向登录页面，否则继续操作：
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HttpSession session = request.getSession(true);
Login loginBean = (Login) session.getAttribute("login");
if(loginBean == null){
response.sendRedirect("login.jsp");
}
else{
//其他操作，省略
}
附：这个一个登录成功后的显示页面：
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<%@page import="com.sun.xml.internal.bind.v2.model.core.ID"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page import="com.zifangsky.OnlineFriend.model.member.Login"%>
<jsp:useBean id="login" type="com.zifangsky.OnlineFriend.model.member.Login" scope="session"/>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<base href="<%=basePath%>">
<%@ include file="head.txt"%>
</head>
<body>
<center>
<font size=4 color=blue>
<jsp:getProperty name="login" property="backNews"/>
</font>
<font size=3>
<% if(login.isLoginSuccess()){ %>
欢迎回来，尊敬的会员：<jsp:getProperty name="login" property="id"/>
<%}
else{%>
<a href="login.jsp">点击这里，重新登录</a>
<%} %>
</font>
</center>
</body>
</html>
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Login loginBean = null;
HttpSession session = request.getSession(true);
try {
loginBean = (Login) session.getAttribute("login");
if(loginBean == null){
loginBean = new Login();
session.setAttribute("login", loginBean);
}
} catch (Exception e) {
loginBean = new Login();
session.setAttribute("login", loginBean);
}
//下面是登录操作，并给loginBean这个javabean的各个参数赋值，省略
在其他页面里，通过判断先前设置的这个session是否为空，为空的话转向登录页面，否则继续操作：
1
2
3
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HttpSession session = request.getSession(true);
Login loginBean = (Login) session.getAttribute("login");
if(loginBean == null){
response.sendRedirect("login.jsp");
}
else{
//其他操作，省略
}
附：这个一个登录成功后的显示页面：
1
2
3
4
5
6
7
8
9
10
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<%@page import="com.sun.xml.internal.bind.v2.model.core.ID"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page import="com.zifangsky.OnlineFriend.model.member.Login"%>
<jsp:useBean id="login" type="com.zifangsky.OnlineFriend.model.member.Login" scope="session"/>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<base href="<%=basePath%>">
<%@ include file="head.txt"%>
</head>
<body>
<center>
<font size=4 color=blue>
<jsp:getProperty name="login" property="backNews"/>
</font>
<font size=3>
<% if(login.isLoginSuccess()){ %>
欢迎回来，尊敬的会员：<jsp:getProperty name="login" property="id"/>
<%}
else{%>
<a href="login.jsp">点击这里，重新登录</a>
<%} %>
</font>
</center>
</body>
</html>
