我目前有以下内容:
HttpSession session = request.getSession();
String discountError = (String) session.getAttribute("discountError");
if (discountError.equals("true")){
session.setAttribute("discountAdded", "false");
forwardPage = "DiscountEnd.jsp";
}
else if (discountError.equals("false")){
session.setAttribute("discountAdded", "true");
forwardPage = "Confirm.jsp";
}
JSP
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<%@ page session="true" %>
<!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>Discount(s) Added Successfully</title>
</head>
<body>
<c:choose>
<c:when test="${discountAdded == 'true'}">
<p align="center">
All Discount(s) added successfully!
</p>
</c:when>
<c:when test="${discountAdded == 'false'}">
<p align="center">
Error Found! No Discounts added!
</p>
</c:when>
</c:choose>
<br>
<form action='HotelOwnerController' method='POST' style="text-align:center">
<input type="submit" name="action" value="Back to Welcome Screen"/>
</form>
当我进入 JSP 页面时，我发现 discountAdded if 条件未得到评估。
有人知道如何读取 JSP 页面中的 session 属性吗？
最佳答案
不，当在 jsp 页面中捕获 session 变量时，它采用“Object”数据类型。我们必须将它们解析为字符串。为此，我们可以使用 .toString() 方法，也可以使用
String str=(String)session.getAttribute("session_name");
或者
String str=(String)session.getAttribute("session_name");
对于您的代码，我建议使用sessionScope
<c:choose>
<c:when test="${sessionScope.discountAdded == 'true'}">
<p align="center">
All Discount(s) added successfully!
</p>
</c:when>
<c:when test="${sessionScope.discountAdded == 'false'}">
<p align="center">
Error Found! No Discounts added!
</p>
</c:when>
关于java - JSP 中调用 session 属性，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/23578770/