modify a request parameter value

[Steven Sajous <st...@dotmarketing.com>]

Is there a way to modify the value of a request parameter in struts. Let's
say I have .../do/something?dispatch=view and in the actionForm that handles
something I could set dispatch to something else before getting the mapping
for /do/nothing for example.

I used to do that in mod-perl if any of you guys have ever done perl

Steven Sajous 
Application Engineer, Dotmarketing Inc. 
http://www.dotmarketing.com 

Re: modify a request parameter value

[Ted Husted <hu...@apache.org>]

Struts uses the standard request object, so you can modify the 
parameters in the usual way. See the Sun JavaDocs regarding the 
HttpRequest object. But, be aware, there are scoping rules about what 
happens when you do this.

In general, you would want to use the ActionForm to capture whatever 
request parameters you are using. Then, you can use them in anyway you 
like on the ActionForm. So, if there were a dispatch property on your 
ActionForm, it would return "view" for you.

If I understand the use-case, the usual approach would to have the 
Action check getDispatch and then return whatever forward is appropriate 
(say findForward("nothing"). The Struts controller would then forward to 
/do/nothing for you.

In general, we try to avoid forwarding from one Action to another, since 
there can be side effects. Most people use something like the 
DispatchAction so that one Action can handle several alternative tasks.

-Ted.

Steven Sajous wrote:
> Is there a way to modify the value of a request parameter in struts. Let's
> say I have .../do/something?dispatch=view and in the actionForm that handles
> something I could set dispatch to something else before getting the mapping
> for /do/nothing for example.
> 
> I used to do that in mod-perl if any of you guys have ever done perl
> 
> Steven Sajous 
> Application Engineer, Dotmarketing Inc. 
> http://www.dotmarketing.com 


-- 
Ted Husted,
Struts in Action <http://husted.com/struts/book.html>



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