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How to avoid validation if request was done by GET method?

 
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I have a form. And I want to have one url for form itself and for submitting it.
Controller should look at method and if it is GET, show form, if POST - make validations and so on.

How can I do it ?
 
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What version of Struts?
 
Boris Romashov
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Struts 2, I also use convention plugin.
 
David Newton
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There's nothing to do that built-in; what I've usually done (because it's really easy :) is use the @Action annotation to map either the input method or a "process" method that'll do validation. I suppose you could do something similar with an interceptor, although I've never tried it with Convention, only a "plain" S2 app.
 
Boris Romashov
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>> what I've usually done is use the @Action annotation to map either the input method or a "process" method that'll do validation.

I don't understand anything
Could you explain more precisely, please.
 
David Newton
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Rather than specifically checking the request type ("GET" or "POST") I've just had different action mappings to display the form and process the form submission.

In Struts 1 I had a base action class that checked for GET/POST and would call validation manually on a POST. Struts 2's architecture makes this impractical on the action side.

In Struts 2 there are (at least) two simple approaches: interceptor side, and action mapping side.

On the interceptor side it's trivial to tweak the validation interceptor to skip validation on GET requests--essentially creating an exact duplicate of the shipping validation interceptor plus a request type check.

On the action mapping side you could display the form with one action mapping and process it with another. The initial form display could be handled by the input() method (which validation skips) and processed with a process() (or re-mapped execute() method?) method, which validation wouldn't skip.

I don't think I've explained myself well--feel free to follow up.
 
Boris Romashov
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Please, look at my 1st post.

>> I want to have one url for form itself and for submitting it.

How does your approach satisfies this requirement ?
 
David Newton
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It doesn't; I guess you'll have to use the other suggestion I made of creating or modifying an interceptor.
 
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