[Springframework-developer] Web app setup

[<jue...@we...>]

Hi webappers,

On an occasion, current web app setup info for Spring:

- You can use just a ControllerServlet: No =
ContextLoader(Listener/Servlet) simply means no root application =
context.
- Mounting a root context from /WEB-INF/applicationContext.xml just =
needs registering ContextLoaderListener/Servlet but no configLocation =
context-param, as this is the default path.
- No MessageSource definition simply means no message definitions in =
this context.
- No LocaleResolver definition means AcceptHeaderLocaleResolver (-> =
browser setting).
- No HandlerMapping definition means BeanNameUrlHandlerMapping (bean =
name =3D sub path).
- No HandlerAdapter definition means SimpleControllerHandlerAdapter.
- No ViewResolver definition means InternalResourceViewResolver (view =
name =3D internal resource path).

A test web app leveraging MVC can thus be set up easily:
- write a Controller that returns new =
ModelAndView("/WEB-INF/jsp/test.jsp", "myattr", "myvalue");
- write a simple test.jsp in WEB-INF/jsp, retrieving myattr from the =
request and showing it;
- make a bean definition for the Controller in a ControllerServlet's XML =
file using the name "/test.do";
- register the ControllerServlet in your web.xml for "/*.do";
- start the web container, open a browser, and call "localhost/test.do".

The first refinement could be to use symbolic view names: Return view =
name "test", and explicitly register a "viewResolver" =
InternalResourceViewResolver with prefix "/WEB-INF/jsp/" and suffix =
".jsp". Explicit view mappings like ResourceBundleViewResolver or =
explicit handler mappings like SimpleUrlHandlerMapping can be introduced =
easily, but they don't  bother you if you don't like or need them (yet). =
And you're only confronted with concepts like populated commands or =
forms if you choose to write respective controllers.

Juergen


DI J=FCrgen H=F6ller
Senior System Architect
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werk3ATS - division systementwicklung
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jue...@we...
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