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Difference between DTO and ActionForm

sudha javvadi
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Joined: Mar 23, 2007
Posts: 97
Hi all,

Could anybody tell me the difference between dto and actionform. Do we need to use both of them in a application. I am doing some sample programs, so far I didn't use dto. In realworld what is the best practise?

Thank you,
Sudha.
SCJP 1.5
Chris Boldon
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Joined: Aug 10, 2006
Posts: 190
ActionForms are coupled to your view.

DTO, or 'Data Transfer Objects' are a common object that is transfered between layers.

ie getting an object out of the database, you won't have an ActionForm, you'll have a different object. If you wanted to display that object on a JSP you would transfer the values to the ActionForm and render the page (well, I wouldn't, but I'm not going to make this complicated).

In the other direction, if you were going to save something to a database from a web form. You'd take the values off of the ActionForm, put them on a DTO and send it on its way to your service layer (well, again arguable if you have some sort of facade or other layer, but speaking basically).
 
It is sorta covered in the JavaRanch Style Guide.
 
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