Newbie trying to understand Core J2EE Patterns - Intercepting Filter
Hello Everyone,
I'm new to JavaEE Filters , and I'm trying to learn them from here:
http://java.sun.com/blueprints/corej2eepatterns/Patterns/InterceptingFilter.html
So far I've understood everything up until "Intercepting Filter sequence diagram "
Now I'm trying to understand the "Example 7.1 Implementing a Filter - Debugging Filter "
The DebuggingFilter class is implementing from the Processor interface, but the Processor interface is not defined anywhere.
I also looked for the Processor interface in the JavaSE6 and JavaEE 5 API , but the only one defined in JavaSE6 is:
javax.annotation.processing.Processor
which is not what the article is talking about I think.
Am I missing something?
Any help / pointers is appreciated.
[808 byte] By [
appy77a] at [2007-11-27 4:54:16]
# 1
The processor class is not part of API. There it was mentioned an alternate approach than using the API provided filter interface.
Here Processor is an interface with a method signature as
public void execute(ServletRequest req,
ServletResponse res) throws IOException,
If you are using API the your filter class implements javax.servlet.Filter , in the same way if you are not using API and developing your own framework your filter will implement Processorclass shown in the example given.
But this is not at all a good practice to use custome filters.
# 2
> The processor class is not part of API. There it was
> mentioned an alternate approach than using the API
> provided filter interface.
>
> Here Processor is an interface with a method
> signature as
> public void execute(ServletRequest req,
>ServletResponse res) throws IOException,
> If you are using API the your filter class implements
> javax.servlet.Filter , in the same way if you are not
> using API and developing your own framework your
> filter will implement Processorclass shown in the
> example given.
>
> But this is not at all a good practice to use custome
> filters.
thanks for your reply, yes I read that it is not good practice to use custom filters.
I was planning to buy the book core j2ee patterns but I was hoping that the examples in it would be concrete examples and incomplete ones.
I don't know if they are concrete or not.
Anyway, I'm giving you the dukes for your reply.
Thank you.
