I have done a combination of this before, using a <jsp:include> that would include a jsp, that renders the <link> tag for css.
the included file is a jsp, that contains the <link>tag to load either the external style sheet, or an inline style sheet, still within the <link> tag.
when i make a seperate file to put my css <link> tags, and other header type things that are common to all pages in my site, it saves me from having to cut-paste across all top level pages when something changes. It is sort of like server side templating / organization of your conent. If you are used using the tiles framework, or similar, this jsp:include model fits nicely with the <tiles:insert> tags.
The motivation of using <jsp:include would render the contents of the seperate my_header.jsp is that the jsp becomes its own servlet, so the invocation is more like a function call, as opposed to if you <%@ include %> 'd it, then it would be verbatim inline with the calling servlet, which IMHO makes makes each file slighly unnecessarily larger and may at times (conspiracy theroy) take a little longer for the JSPs to compile (when you have hundreds) I also prefer the <jsp:include over the <%@ include %> as I have noticed sometimes, on older (websphere) app servers do not always know to recompile a JSP when the <%@ include %>'d file is changed.
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I'd say that the decision to use an include directive vs. an include action should be made depending on whether it makes sense for a separate (sub)request to be made to the resource or not --not to get around a container issue.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com
subject: jsp include vs. link tag for including CSS