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Posted to users@tomcat.apache.org by Seth Ladd <se...@ehawaii.gov> on 2003/12/19 01:12:33 UTC
Way to get Reference to Servlet from Filter?
Hello,
I don't think this is possible, but I'm giving it a shot anyway. :)
I'd like to get ahold of a servlet reference from within a filter. Is
there a way?
I have a filter that creates objects and places them within the request
scope, but it does it differently for each end-result servlet. I'd like
the filter to look at the URI, determine the servlet, and grab the
servlet. Then, it can either grab its init-params or just call a
special method to get the data it needs.
Now, this idea might be broken to begin with. The other idea is to just
create a super class for the servlet and handle this base logic from
there. If I can use a filter, though, that would be great.
Any tips or hints? I hope I wasn't too vague.
Thanks very much!
Seth
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Re: Way to get Reference to Servlet from Filter?
Posted by Seth Ladd <se...@ehawaii.gov>.
Tim Funk wrote:
> You won't be able to get the servlet reference. A possibility is to
> define the filter multiple times with different parameters. For example,
> here is the same class name defined 4 times as 4 different filters.
Good idea. Thanks for the helpful response. Since I can't get a
reference to the servlet, I've resorted to reading in the web.xml file
itself to get any init-params I would need.
Thanks!
Seth
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Re: Way to get Reference to Servlet from Filter?
Posted by Sean Dockery <us...@sbdconsultants.com>.
"I've got a fever... and the only cure is more cowbell!"
LOL. :-D
"Tim Funk" <fu...@joedog.org> wrote in message
news:3FE2FC7F.2080409@joedog.org...
> You won't be able to get the servlet reference. A possibility is to define
> the filter multiple times with different parameters. For example, here is
the
> same class name defined 4 times as 4 different filters.
>
> <filter>
> <filter-name>filter1</filter-name>
> <filter-class>more.Cowbell</filter-class>
> <init-param>
> <param-name>my</param-name>
> <param-value>attribute</param-value>
> </init-param>
> </filter>
> <filter>
> <filter-name>filter2</filter-name>
> <filter-class>more.Cowbell</filter-class>
> </filter>
> <filter>
> <filter-name>filter3</filter-name>
> <filter-class>more.Cowbell</filter-class>
> <init-param>
> <param-name>another</param-name>
> <param-value>some value</param-value>
> </init-param>
> </filter>
> <filter>
> <filter-name>filter4</filter-name>
> <filter-class>more.Cowbell</filter-class>
> </filter>
>
> I'll leave it up to you to figure out the mappings according to your
constraints.
>
> -Tim
>
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Re: Way to get Reference to Servlet from Filter?
Posted by Tim Funk <fu...@joedog.org>.
You won't be able to get the servlet reference. A possibility is to define
the filter multiple times with different parameters. For example, here is the
same class name defined 4 times as 4 different filters.
<filter>
<filter-name>filter1</filter-name>
<filter-class>more.Cowbell</filter-class>
<init-param>
<param-name>my</param-name>
<param-value>attribute</param-value>
</init-param>
</filter>
<filter>
<filter-name>filter2</filter-name>
<filter-class>more.Cowbell</filter-class>
</filter>
<filter>
<filter-name>filter3</filter-name>
<filter-class>more.Cowbell</filter-class>
<init-param>
<param-name>another</param-name>
<param-value>some value</param-value>
</init-param>
</filter>
<filter>
<filter-name>filter4</filter-name>
<filter-class>more.Cowbell</filter-class>
</filter>
I'll leave it up to you to figure out the mappings according to your constraints.
-Tim
Seth Ladd wrote:
> Hello,
>
> I don't think this is possible, but I'm giving it a shot anyway. :)
>
> I'd like to get ahold of a servlet reference from within a filter. Is
> there a way?
>
> I have a filter that creates objects and places them within the request
> scope, but it does it differently for each end-result servlet. I'd like
> the filter to look at the URI, determine the servlet, and grab the
> servlet. Then, it can either grab its init-params or just call a
> special method to get the data it needs.
>
> Now, this idea might be broken to begin with. The other idea is to just
> create a super class for the servlet and handle this base logic from
> there. If I can use a filter, though, that would be great.
>
> Any tips or hints? I hope I wasn't too vague.
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