Hey - thanks for the info. Yeah, someone else also mentioned Struts to me
recently; I'll look into it. BTW, you mentioned Xalan XSL parser. Could
you tell me where I could get that? I'm using JRUN as my app server and i
*SWARE* the damned tag for parsing XSL doesn't work!
Thanks.
Neal
-----Original Message-----
From: A mailing list about Java Server Pages specification and reference
[mailto:[EMAIL PROTECTED]]On Behalf Of Duffey, Kevin
Sent: Saturday, December 30, 2000 6:12 PM
To: [EMAIL PROTECTED]
Subject: Re: [JSP-INTEREST] Servlets v. JSP
I beg to differ. JSP pages can often be converted to more optimized servlets
than hand-coding the servlet yourself. This depends on the author of the JSP
engine that does the conversion of the JSP page, but in general there are
some advantages to using JSP. However, I a strong advocate for the MVC
model. Frameworks like Struts allow more separation of the Model, View and
Controller. By using Struts or frameworks like it, you use JSP pages almost
exclusively for HTML content, with some dynamic Java code embeded to do
looping or conditional displays of html. With JSP 1.1, its better to use a
tag-lib to remove as much java code out of a jsp page as possible. As I
discovered, if your using servlets to do html, you have hard-coded html that
is a pain in the ass to modify (for the most part). Worse, if you utilize a
hierachy of servlets, where a base servlet may display a few items with some
hooks in it to call descendant servlet methods to add more content, its much
harder to make a change without affecting other areas of the site.
Something I am looking in to is instead of JSP with html, using JSP to
return dynamic XML, which then passes through Xalan XSLT engine to convert
it to HTML via XSL. While its an extra step, and does indeed cost in
performance, you can always add more hardware. That is afterall one of the
benefits of moving to an application server that supports load balancing and
fail-over. You simply add in another server and you can handle "x" more
hits, as well as achieve a little more fail-over safety of your site. This
does depend on the mechanism an app server uses to fail over to other
servers. WebLogic has a "buddy" system, where it fails over to one other
server, so any session data in memory on one server is replicated to the
second server as well (therefore increasing the amount of memory needed for
each server). Orion app server does it a bit differently, with the use of
island clusters. Each server in an island shares its memory with the other
servers. If you have 10 servers in one island, all 10 servers share any
memory objects in their ServletContext with the other servers on the island,
thus requiring huge amounts of memory for each server (assuming each client
on each server uses a lot of memory). However, a benefit is that you can
just put two or three servers in each island, and have several islands
instead!
Anyways..for what its worth, I would look into Struts or similar frameworks.
They provide the best of all worlds..use of JSP for the View, Servlets for
controlling the flow, and the ability to call EJB or other session classes
to do the business logic, thus separating the control into two areas of more
manageable chunks.
> -----Original Message-----
> From: Fetyko Jan [mailto:[EMAIL PROTECTED]]
> Sent: Saturday, December 30, 2000 11:23 AM
> To: [EMAIL PROTECTED]
> Subject: Re: Servlets v. JSP
>
>
> One of the good reasons is that the servlet is faster then a JSP page.
> If you get 1000's hits per hour to the same URL, you want it
> to be fast.
> Another reason might be that with building servlets you're
> separating the
> presentation layer from the processing layer.
>
> Jf
>
>
>
>
> Neal Cabage
> <ncabage@ICONIXX. To:
> [EMAIL PROTECTED]
> COM> cc:
> Sent by: A Subject:
> Servlets v. JSP
> mailing list
> about Java Server
> Pages
> specification and
> reference
> <JSP-INTEREST@jav
> a.sun.com>
>
>
> 12/29/00 06:59 PM
> Please respond to
> nealcabage
>
>
>
>
>
>
> Anyone out there using servlets rather than JSPs? Why would
> a person build
> a servlet rather than letting JSP just build one for you. My initial
> thought is that a pure hand-written servlet might be more efficient if
> there
> is no actual output. Perhaps one might also consider it
> better style for
> the same reason. This is just speculation however and JSP just seems
> easier
> and more time efficient...so would there be a good reason for
> hand-writing
> your own servlets instead?
>
> Thanks.
> Neal
>
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> Some relevant FAQs on JSP/Servlets can be found at:
>
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
>
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> JSP-INTEREST DIGEST".
> Some relevant FAQs on JSP/Servlets can be found at:
>
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
>
===========================================================================
To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff
JSP-INTEREST".
For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST
DIGEST".
Some relevant FAQs on JSP/Servlets can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
===========================================================================
To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST".
For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST".
Some relevant FAQs on JSP/Servlets can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
http://www.jguru.com/jguru/faq/faqpage.jsp?name=Servlets
