How to get session attribute with a dynamic key in EL?

java jsp jstl el

Nur Aini · Nov 29, 2011 · Viewed 36.9k times · Source

If I set session like this:

<% 
session.setAttribute("taintedAttribute", "what ever we want");
%>

normally we can get session variable like this in EL

${sessionScope.taintedAttribute }

But how about if I want to do like this

<% 
String name = "taintedAttribute";
//session.setAttribute(name, "what ever we want");
session.getAttribute(name);
%>

Then how can we call it in EL?

Can EL get something like ${sessionScope.---dynamic name ---}?

If I do this:

<c:set var="name" value="taintedAttribute" />
<c:out value="${sessionScope.[name]}"/>

the name will be replaced by taintedAttribute as the same as this line

${sessionScope.taintedAttribute}

Is that possible? How can I do that?

Answer

<c:set var="name" value="taintedAttribute" />
<c:out value="${sessionScope.[name]}"/>

You were close. Remove the period.

<c:set var="name" value="taintedAttribute" />
<c:out value="${sessionScope[name]}"/>