Another thread in the replies was about XML and JSP.
On Wed, 19 Jan 2000, Mick Chang wrote:
> I kind of disagree that JSP provide a separation of presentation and content
> logic.
Hopefully the tag library replies have addressed this point.
> I hear people talk about it, but I've yet to see a good demo that scales
> with it.
We need more exapmles, I agree. But there are a number of "real life"
sites out there that are using JSPs. For example, a few I like include
"www.carorder.com", "www.wine.com" and "www.spray.se". There are many
more.
> > Most people I've heard from think that a more scalable way to separate
> > presentation from content logic is to use XML served up with Servlets.
As some other people have said, it is not an either/or. One can use JSP
to generate XML, or use XML to generate (X)HTML via a JSP. Sylvain's
example below is of the first type:
Sylvain Randier wrote:
> I believe there is a way to separate content logic and design with JSPs.
> JSP has kinda similarities with XML because the JSP tags follow the XML
> syntax. You can also define your own JSP tags using tag libraries.
>
> But there are not enough examples about how to use tag libraries, so if
> you have some, share them ;-) In fact I have developed a web application
> with JSPs and faced with some lack of examples/doc about this technology.
Yes, you are right, we are very thin on examples. There are several
books that are being cooked right now, and we plan to release a number
of examples via an ASF project in jakarta. Stay tuned.
> The right thing will be I think to combine the best of both worlds.
> Generate your XML with JSP:
> <?xml version="1.0" ?>
> <%@ page language="java" import="mypackage.*" %>
> <jsp:useBean id="myBean" scope="session" class="SessionBean" />
> <?xml-stylesheet type="text/xsl" href="<%=myBean.getXSLFileName() %>" ?>
> <mytag>
> .....
> </mytag>
>
> Then, the browser requests a JSP file, returning XML content, which can
> link with an XSL stylesheet as shown above.
>
> Some clients are able to display such XML files (Mozilla, IE5).
> In order to display HTML for older clients, tag libraries may be used,
> enabling the page to be easily migrated to XML later.
Sylvain's last sentence relates to the second type I mentioned earlier:
using XML form a JSP to generate (X)HTML - or to generate more XML. For
example, you can define a tag of the form, say:
<x:applyXSLT source="anURLtoSource" style="aURLtoStyleSheet" />
whose sematics is to get the source an apply a stylesheet. This has
some cost in the current incarnation since (a) the Servlet
infrastructure does not provide a way to do this except by creating a
new client request, and (b) the current XSLT implementatons are DOM
based (although I know james clark was looking into applying
transformations on event streams). We will be looking at these for the
next version of the spec.
Also, some JSP vendors are already providing products that combine JSP
and XSL. I konw that Caucho and IBM are doing that, and I think that so
are Oracle and Allaire.
If you are interested in JSP, I'd encourage you to subscribe to
jsp-interest since most announcements and discussion happens there. You
can always subscribe in digest mode to get 1 message a day.
Hope this helps,
- eduard/o
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