I need to Call a servlet which will then make a decision as to which JSP
page get called.
(all on the server side)
I received this message some time ago but have since moved on to JSP 0.92.
Since this example will not work with JSP 0.92, could I get new example.
David A. Fabrizi
-----Original Message-----
From: A mailing list about Java Server Pages specification and reference
[mailto:[EMAIL PROTECTED]]On Behalf Of Kirkdorffer, Daniel
Sent: Wednesday, February 03, 1999 2:20 PM
To: [EMAIL PROTECTED]
Subject: Re: JSP Access Models
Rich,
We've been primarily using the second model, where a call is made to a
servlet which calls a JSP page.
There isn't a lot to do really. You process the servlet call as you wish,
perhaps going to a database or whatever using JDBC, and then decide how to
respond. Since we're using the 0.91 spec, I'll provide code examples for
0.91.
Once you have decided how to respond, perhaps created a Bean, you can set
any <BEAN> data in your JSP with a setAttribute call:
for example:
((HttpServiceRequest)req).setAttribute("results", resultObject);
Then you invoke the JSP file:
((HttpServiceResponse)resp).callPage("myData.jsp", req);
The JSP file will have a <BEAN> tag in it referencing the results object,
something like:
<BEAN NAME="results" TYPE="com.mycompany.mypackage.MyObject" introspect="no"
create="no" scope="request"></BEAN>
and then you simply process the results within the JSP with code that might
look like this:
<%
// Iterate through data
int endPos = results.getSize();
for (int i=1; i <= endPos; i++) {
%>
<p><%= results.getData(i) %>
<%
};
%>
And that's about it.
Of course you can decide to call any JSP file you wish. Or you might just
redirect to a page using
resp.sendRedirect("mywebpage.html");
One thing to remember is that you can't change the target frame/window of
your servlet call. The target= in your HREF or Form action statement cannot
be modified in your servlet (or at least I don't know of a way to do that).
Anyway, I hope this helps. I rarely call a JSP directly given I usually
need to populate it with a Bean I create on the fly.
Cheers,
Dan
--
Daniel Kirkdorffer
Sr. Consultant, Syllogistics LLC
Web: http://www.syllogistics.com/
Email: [EMAIL PROTECTED]
> ----------
> From: Rich Nill[SMTP:[EMAIL PROTECTED]]
> Reply To: Rich Nill
> Sent: Wednesday, February 03, 1999 10:07 AM
> To: [EMAIL PROTECTED]
> Subject: JSP Access Models
>
> Hello -
>
> The JSP spec 0.92 describes 2 access models. In model 1, a request is
> sent directly to JSP file. In model 2, a request is sent to a Servlet
> which does the processing and then explicitly executes a JSP file.
>
> My question is, has anyone dealt with this second access model? If so,
> could you share an example with me on how this is done. The examples
> distributed with Sun's reference implementation of JSP seem to all use
> access model 1.
>
> For example, our application contains a search engine. In this case,
> we'll assume the search engine has the following web pages:
>
> - a "search" page which allows the user to enter search criteria
> - a "list" page which displays a list of items which met the search
> criteria
> - a "detail" page which lists the details of one of the items
>
> The search engine is a drill down application. The user enters some
> search criteria and presses "search". Here's the twist. If only one
> item meets the search criteria, we should display the "detail" page for
> this item. Otherwise, if more than one item meets the search criteria,
> we should display the "list" page with all items which meet the
> criteria. From the "list" page, a user can select a particular item to
> get the "detail" page.
>
> Access model 2, as described in the JSP spec, seems to be a good fit for
> the above problem.
>
> Thanks for the help,
>
> Rich Nill
> Signal Internet Technologies, Inc.
>
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