RE: Struts2: How can I make a Filter redirecting to struts actions - SOLVED!

[Ov...@posten.se]

Hi Dariusz,
Thanks for the input. After some coding and reading in the Struts 2.0.2 sourcecode I got this to work.

In general it seems that Struts2 uses two methods from the request to examine URI (in this order):

- request.getServletPath()
- request.getRequestURI()

The real trick is, as you suggested, to create my own instance of HttpServletRequest and implement set-methods for those two, manipulate the values and pass on the reference to filter.doFilter(req, res). The nice thing is that there is a javax.servlet.http.HttpServletRequestWrapper class that do a base implementation of the request. Extend that and implement setServletPath(String arg0) and setRequestURI(String arg0) methods.

Very nice!

------
Martin Gainty-
Thanks for your input to my question. As you understand of my answer above, a redirect from an JSP page is way to late in the request sequence. The thing with keywords is to implement Wiki functionallity into a normal Struts built website. If a client request http://somesite.com/keyword my filter ask the WikiEngine if it recognizes the keyword. If it does, I modify the request to my template.action instead. I store the Wiki keyword as an request attribute to be picked up and presented by the template. By this I can serve simple easy editable pages in Wiki format and use Struts for more advanced pages. An important goal is to hide the redirect for a web browser so when a user bookmarks a page, the url point to a keyword and not an ugly redirect.
------

Thanks again for the help!
Regards,
 Ove Oldberg



> -----Ursprungligt meddelande-----
> Från: Dariusz Wojtas [mailto:dwojtas@gmail.com] 
> Skickat: den 7 december 2006 09:39
> Till: Struts Users Mailing List
> Ämne: Re: Struts2: How can I make a Filter redirecting to 
> struts actions
> 
> Hi,
> 
> If your filter is called before the struts filter, then what about
> preparing your own HttpServletRequest instance (some wrapper) and
> passing it deeper into doFilter(..)?
> You could copy all properties of the original request but change the
> URI (or whatever property is responsible for it).
> The next filter/servlet would be fooled by this switch and their
> calculations (ie. finding what action should be executed) would be
> done on data prepared by you.
> 
> Best regards
>   Dariusz Wojtas, Poland
> 
> On 12/7/06, Ove.Oldberg@posten.se <Ov...@posten.se> wrote:
> > Hi everybody,
> > I have experimented with a filter that triggers for keywords on the
> > request URL
> > and when found it should redirect to a struts action that 
> processes the
> > keyword.
> >
> > My dilemma is that I don't want to use:
> > response.sendRedirect("/some.action");
> > becoz redirect should be done internally in the servlet 
> container, not
> > via browser.
> >
> > I have tested:
> > 
> request.getRequestDispatcher("/some.action").forward(request, 
> response);
> > and it don't work. I guess becoz an action mapping is not a 
> servlet, an
> > JSP page is.
> >
> > Does anyone have an idea how to solve this? Any input welcome!
> >
> > One approach could be to inherit:
> > org.apache.struts2.dispatcher.FilterDispatcher
> > and override doFilter() method and insert my keyword code. 
> Kinda ugly
> > thou.
> >
> > Regardings,
> >  Ove Oldberg, Sweden.
> 
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