会话处理在 JSP 页面中不起作用？

Question

When I submit a form present in Index.jsp it goes to Home.jsp page and if log out it also redirects to Index.jsp page.当我提交 Index.jsp 中的表单时，它会转到 Home.jsp 页面，如果注销，它还会重定向到 Index.jsp 页面。 But when I try to access Home.jsp page without login is shows an error.但是当我尝试在没有登录的情况下访问 Home.jsp 页面时显示错误。 Ideally it should redirect to Index .jsp page because session at理想情况下，它应该重定向到 Index .jsp 页面，因为 session at

Home.jsp主页.jsp

<%@page import="com.bean.UsersBean"%>
<%@page import="com.util.DAO"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1"/>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<script
    src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="JS/General.js"></script>
<script
    src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script
    src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>

<link rel="stylesheet"
    href="https://use.fontawesome.com/releases/v5.1.1/css/all.css"
    integrity="sha384-O8whS3fhG2OnA5Kas0Y9l3cfpmYjapjI0E4theH4iuMD+pLhbf6JI0jIMfYcK3yZ"
    crossorigin="anonymous">
<link rel="stylesheet"
    href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet"
    href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<link rel="stylesheet" href="CSS/General.css" content="text/css">

<title>Insert title here</title>
</head>
<body style="background-color: grey">
<%@include file="sessionManagement.jsp"%>
    <%
            String email =session.getAttribute("email").toString();
            String password =session.getAttribute("pwd").toString();
            System.out.println(email + " JSP");
            System.out.println(password + " JSP");
            UsersBean obj = DAO.login(email, password);
            //System.out.println(obj.getProfile()); 
    %>

After this I have used this obj to display some details of user in the page.在此之后，我使用这个obj在页面中显示用户的一些详细信息。

sessionManagement.jsp page code sessionManagement.jsp 页面代码

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<% if(session==null && session.getAttribute("email")==null)
        response.sendRedirect("Index.jsp");

    %>  
</body>

Answer 1

There's a problem with your if statement in the jsp page. jsp 页面中的 if 语句有问题。

if(session == null && session.getAttribute("email") == null)

according to your if statement, the page is redirected if the session is null, and you are checking for an attribute when the session is null, and you haven't mentioned the variable session anywhere in sessionManagement.jsp .根据您的 if 语句，如果session为空，页面将被重定向，并且您在会话为空时检查属性，并且您没有在sessionManagement.jsp任何地方提到变量session 。

Another thing to keep in mind is that in a jsp page the HttpSession will never be null .要记住的另一件事是，在jsp 页面中， HttpSession永远不会为null 。

Replace your if statement.替换您的 if 语句。

if(request.getSession().getAttribute("email") == null){
    response.sendRedirect("index.jsp");
    return;
}

会话处理在 JSP 页面中不起作用？

问题描述

1 个解决方案

解决方案1
2 已采纳 2018-08-18 17:26:04

会话处理在 JSP 页面中不起作用？

问题描述

1 个解决方案

解决方案1 2 已采纳 2018-08-18 17:26:04

解决方案1
2 已采纳 2018-08-18 17:26:04