Hi Craig,
Exactly ! We have done in the same way.
1. Getting the action name from the hidden field.
String action_name =
request.getParameter("ACTION_NAME");
Then instantiating the business object in either of
the following ways.
a) BusinessInterface businessObject = (BusinessObject)
action_name;
b) BusinessInterface businessObject =
BusinessObjectfactory.createBusinessObject(action_name);
But I would like to know from you, whether this
approach is not running short of anything ?
I have seen few of the approaches made use of event
delagation methodology. Can someone explain that
methodology in web context and also a possible
comparison between the two ? I am sorry if I am trying
to bring something unusual here.
Thank you foryour replies,
Manisha
--- "Craig R. McClanahan"
<[EMAIL PROTECTED]> wrote:
> Manisha Menon wrote:
>
> > Hi all,
> >
> > I know the question is very silly, but I am sorry
> I
> > could not avoid asking your help.
> >
> > I follow the MVC design methodology in my web
> > framework which has got servlets, jsp and beans.
> >
> > JSP page forwards the request to the controller
> > servlet requesting for a certain action.
> > The servlet controller after receiving the request
> > object,instantiates the appropriate
> > business bean, which will use connection pool
> manager
> > and data access beans for manipulating
> > the data. After completing the data handling
> > operations, the servlet
> > controller returns the manipulated data back to a
> new
> > JSP page.
> >
> > Now my question :
> >
> > How is the conversion/ translation of the action
> (say
> > for example updation, insertion or deletion) which
> is
> > coming from the client JSP page done by the
> controller
> > servlet taken to the
> > right instance of business bean ? A single page
> may
> > have more than one action. Now, how do the
> controller
> > servlet calls the UpdateBusinessBean for update
> action
> > and InsertBusinessBean for insert action ? The
> method
> > that will be used by the client to invoke the
> servlet
> > is "POST". Can I ask you, what are the possible
> ways
> > of doing this, (Already I have adopted one method
> in
> > my last assignment, but I am not too happy about
> it,
> > as it did not consider scalabilty issues and also
> it
> > was tightly coupled.)
> >
> > Manisha
> >
>
> In a "database maintenance" application like what
> you describe, it is common to
> have a single action class that is called upon to
> perform slightly different
> actions (such as an INSERT for a new row, or an
> UPDATE for a second).
>
> What I often do in such situations is include a
> hidden field in the input form that
> says one of the following things:
>
> <input type="hidden" name="action"
> value="Create">
> <input type="hidden" name="action"
> value="Delete">
> <input type="hidden" name="action" value="Edit">
>
> depending on which action the user originally asked
> for. That way, the action
> class knows what to do, based on calling:
>
> request.getParameter("action")
>
> to see what was included in the form.
>
> For cases where the user doesn't select which action
> to perform until the form is
> submitted, this field could be set in a JavaScript
> function, or be chosen by which
> submit button was pressed.
>
> Craig McClanahan
>
>
===========================================================================
> To unsubscribe: mailto [EMAIL PROTECTED] with
> body: "signoff JSP-INTEREST".
> 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
__________________________________________________
Do You Yahoo!?
Send instant messages with Yahoo! Messenger.
http://im.yahoo.com/
===========================================================================
To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST".
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
