On Fri, 2006-07-28 at 19:58 +0200, Henning Schild wrote:
> Hello,
>
> i am currently working on my first struts application. That is why i am
> looking at the example and there are a few things i do not understand.
>
> The tour says something about an action-mapping
>
> > <action path="/EditRegistration"
> > ...
>
> indeed there is nothing like this in the struts-config.xml
>
> How does struts know which Action to execute? It could know that from
> the name because there is an EditRegsitrationAction.class but how does
> it know which jsp to use? There is a Regsitration.jsp which handles
> EditRegsitration.do but i don't see a action-mapping for that. I also
> don't see any form-bean definitions for the whole Registration stuff.
> Are there naming conventions which handle all that? And if they exist
> where do i find documentation about that.
> I read the UserGuide but that does not tell about naming cenvetions for
> form-beans or action-mappings.
>
> I hope you can answer my questions.
>
> Henning
Henning,
>From the Tour:
If you check the struts-config.xml, you'll see that the
editRegistration action is mapped to the (surprise again!), the
EditRegistrationAction; it uses a registrationForm bean, and
registration.jsp for input.
<!-- Registration form bean -->
<form-bean name="registrationForm"
type="org.apache.struts.example.RegistrationForm"/>
<!-- Edit user registration -->
<action path="/editRegistration"
type="org.apache.struts.example.EditRegistrationAction"
name="registrationForm"
scope="request"
validate="false"
input="/registration.jsp">
<forward name="success" path="/registration.jsp"/>
</action>
The fact that the path, type, and forward values are similar is simply a
convention that makes it easier to understand without memorizing the
struts-config file.
The /editRegistration.do URL is mapped to the EditRegistrationAction
class in the <action> tag shown. It's tied to the form-bean above
through the name attribute of the <action> tag.
The Action forwards to the JSP view via a call at the end of its execute
method:
return mapping.findForward( "success" );
And as you see there is a local forward for this action keyed on
"success" to "/registration.jsp". If it was absent, there would need to
be a global forward for it.
I hope this helps.
I'm a Struts newbie myself, hoping to improve my understanding through
helping others (and being corrected unmercifully).
Chris
--
Christopher D. Goldman
[EMAIL PROTECTED]
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