Here's my input from a slightly different model.
To provide a scalable and seperated architecture, I use servlets and JSP's
for the presentation logic and http session management only. Session EJB's
represent my business logic layer, and either entity EJB's or regular
objects represent my entity layer or business objects. This gives me a good
object oriented architecture as well as good seperation of layers. The
EJB's provide me with a scalability.
Hope this helps
Thomas Glover
Software Engineer
NETdelivery Corp.
4725 Walnut
Boulder, CO 80301
(303) 245-7347 Fax: (303) 245-9122
http://www.netdelivery.com <http://www.netdelivery.com/>
mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
-----Original Message-----
From: Hu, Jeffery X (Jeff) [mailto:[EMAIL PROTECTED]]
Sent: Monday, October 25, 1999 10:00 AM
To: [EMAIL PROTECTED]
Subject: Re: when to use Bean !!!
This is what I think .
First, let me explain the design model I implement (say, a DB query
application)
1. Client sends (HTML) request to servlet asking for data from db. Client
submit
userid & password.
2. Servlet conducts db access authentication
-> if login not allowed, feebacks login page (using rd.forward)
-> o.w, Servlet query db and generate a resultSet. Forward the resultset
to a jsp file, say Format_RS.jsp
3. Format_RS.jsp formats the ResultSet to HTML Table (for example ) and
feeback to client. ( I am experimenting using Format_RS.jsp just to
generate a HTML string (eg HTML_out =" <Table> .. </Table>). After that,
fowards the HTML string to another jsp Prsent_RS.jsp to display in client's
browser)
(client -> servlet -> format_rs.jsp -> prsent_RS.jsp - client. Javabean only
provides support functionalities)
I use java beans in servlet and jsp. Just like I use DLL functions in
windows application. In the above model, servlets only take care of the
business logic. Prsenting info to client is jsp's tasks.
Personally, I don't like to use javabeans in JSP to connect/query DB, since
it is too messy to mix up HTML and jsp tags. As well, I don't use javebean
to format resultset either. Simplily because I don't want to recompile the
javabean source code to make a change in display. A text editor and a non
java programmer and do the job.
I will highly appreciate someone points out my mistake and give me
suggestion.
Sincerely
Jeff
-----Original Message-----
From: Carlos H. L�pez [ mailto:[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]> ]
Sent: Monday, October 25, 1999 8:25 AM
To: [EMAIL PROTECTED]
Subject: Re: when to use Bean !!!
I want to add to this question, When use a Bean and When to use a
Servlet?
Thanks, Carlos.
"The successful man make their own opportunities."
"ACI Team (Chennai)" wrote:
>
> Hi
> Does any one has clear picture of when to use bean in Jsp....
> Help of any sort appreciated..
>
> Aciteam
>
>
===========================================================================
> To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff
JSP-INTEREST".
> FAQs on JSP can be found at:
> http://java.sun.com/products/jsp/faq.html
<http://java.sun.com/products/jsp/faq.html>
> http://www.esperanto.org.nz/jsp/jspfaq.html
<http://www.esperanto.org.nz/jsp/jspfaq.html>
===========================================================================
To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff
JSP-INTEREST".
FAQs on JSP can be found at:
http://java.sun.com/products/jsp/faq.html
<http://java.sun.com/products/jsp/faq.html>
http://www.esperanto.org.nz/jsp/jspfaq.html
<http://www.esperanto.org.nz/jsp/jspfaq.html>
===========================================================================
To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST".
FAQs on JSP can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
