Raible's Wiki: ValueObjectInForm

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I guess this page should really be DTOInForm since Data Transfer Object is the proper designation for a data bean. Anyways, this is really a hot topic right now in Raible world and I would very much like to determine how best to use this design in applications. In short, what relationship do DTO objects and ActionForms (or DynaActionForms) have and where are the supporting methods for these objects added. That is the question on the table.

!!The history of appfuse's DTO/ActionForm design

When [I|MattRaible] first started developing with Struts (pre 1.0), I'd just have a simple form with a DTO (VO back then) as a getter/setter on my form. In the last year, I've changed to have a DTO and a Form, where the DTO has the true data types (Long, Date, etc) and the form has only Strings. After doing it both ways, it seems like the DTO as a getter/setter is really the better way

to go. I'm not trying to say it's the *right* way according to the design patterns, I'm just offering my $.02 from experience. I continue to do it the BeanUtils.copyProperties() way, but the projects I work on that do it the other way seem cleaner.

For an example of a DTO -> BeanUtils.copyProperties() -> Form, check out the following links:

DTO -> User.java (source: [http://tinyurl.com/emo7])

Conversion -> UserManagerImpl.java (source: [http://tinyurl.com/emof]

- see convert() method). This extends BaseManager ([http://tinyurl.com/emok]),

which registers custom converters. No DateConverter in this example,

but I've done it at my day job, so I know it's fairly easy.

Form -> UserForm.java (generated via XDoclet from User.java)

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''This discussion originated on the [struts-user mailing list|http://www.mail-archive.com/struts-user%40jakarta.apache.org/msg69836.html].''

~ [MattRaible]

__Related Pages:__

* [POJOsToForms]

--> Please see [DTOInForm]

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