Thank you craig.
I am definitely looking at the struts framework today.
But can you please enlighten me about the action
dispatcher in the framework.
I sincerely thank you for showing some direction.
Manisha.
--- "Craig R. McClanahan"
<[EMAIL PROTECTED]> wrote:
> Manisha Menon wrote:
>
> > 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
> >
>
> This doesn't directly address your questions, but
> you might want to take a look at
> the Struts framework at
> <http://jakarta.apache.org/struts>, which provides a
> fleshed out framework for the MVC controller servlet
> and action dispatcher, plus
> some nice support for dealing with forms and
> internationalized applications through
> a JSP custom tag library.
>
> For simple applications, I implement my business
> logic in the action class that
> gets invoked by the controller servlet. For more
> complex needs, I think of the
> action class as following the "adapter" design
> pattern, translating the HTTP
> request parameters into appropriate property setter
> calls on business logic beans
> (either EJBs or regular JavaBeans). The business
> logic beans, then, are insulated
> from the fact that they were invoked in a web
> application, so you can reuse them
> elsewhere.
>
> Craig McClanahan
>
>
> >
> > --- "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
> > >
> > >
> >
>
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