How to evaluate a scriptlet variable in EL?

I was wondering if there was anyway of using JSP in <c:if> statement.

E.g.

<c:if test="${ param.variable开发者_Go百科1 == 'Add' <% JSP variable clause %>}">

So I want my JSP variable to checked against as well.

Any suggestions? I have tried ignorantly just sticking in the clause, obviously it did not work.

Thanks

So you want to evaluate a scriptlet variable in EL? Store it as a request attribute. The below example will make it available as ${foo}.

<%
    String foo = "some";
    request.setAttribute("foo", foo);
%>

<c:if test="${param.variable1 == 'Add' && foo == 'some'}">

However, this makes no sense. You should avoid scriptlets altogether and use JSTL/EL to prepare this variable. So if you make the functional requirement more clear, e.g. "How do I do this (insert scriptlet code snippet) using JSTL/EL?", then we'll be able to suggest the right approach.

For example, you could use <c:set> to set a variable in EL scope.

<c:set var="foo" value="some" scope="request" />

Or if the JSP is forwarded by a servlet, then use request.setAttribute() over there right away.

String foo = "some";
request.setAttribute("foo", foo);
request.getRequestDispatcher("/WEB-INF/your.jsp").forward(request, response);

This will then be available as ${foo} the same way.

See also:

• Our EL wiki page
• Difference between <%= foo %> and ${ foo }
• Use EL ${XY} directly in scriptlet <% XY %>
• What are implicit objects? What does it mean?
• Generate an HTML Response in a Java Servlet