使用JSTL设置会话变量并在servlet / controller类中访问它
[英]Set session variable using JSTL and accessing it in servlet/controller class
问题描述
If I set session variable using JSTL like this: 
如果我像这样使用JSTL设置会话变量：
<c:set var="para" value="${CLIENT_LOGO}" scope="session" />
Then how can I access the variable "para" in a servlet/controller class? 那么如何在servlet / controller类中访问变量“ para”？
I tried the below code variations, but none worked. 我尝试了以下代码变体，但没有一个起作用。
request.getAtrribute("para")
request.getSession().getAtrribute("para")
Note: I'm not looking for a solution to print the value in a jsp something like: 注意：我不是在寻找一种解决方案来在jsp中打印值，例如：
<c:out value="${sessionScope.para}" />
But instead, I would like to know whether any solution possible to get it in Java class. 但是，我想知道是否有任何解决方案可以在Java类中获得它。
2 个解决方案
解决方案1
4 2015-05-29 11:07:43
You have to do following code in your servlet: 您必须在servlet中执行以下代码：
HttpSession session = request.getSession();
String para = session.getAttribute("para");
You can set session with JSTL 您可以使用JSTL设置session
<c:set var="para" value="valueHere" scope="session" />
解决方案2
0 2019-06-14 11:51:43
One can solve this problem by referring to this code. 可以通过参考此代码来解决此问题。
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<html>
<body>
This JSP stores the ultimate answer in a session-scoped variable where
the other JSPs in the web application can access it.
<p />
<c:set var="theUltimateAnswer" value="${41+1}" scope="session" />
Click <a href="displayAttributes.jsp">here</a> to view it.
</body>
</html>
For displaying value 用于显示价值
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core" %>
<html>
<head>
<title>Retrieval of attributes</title>
</head>
<body>
The ultimate answer is <c:out value="${sessionScope.theUltimateAnswer}" /> <br/>
</body>
</html>
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