Question

I need do something special to specific Servlet class object by :

if (currentServlet instanceof SpecificServlet) {
      // do something special...
}

But I can not find a method in FIlter to get the currentServlet.

Answer 1

There is no such thing as current servlet in a filter. In fact sometimes the filter itself handles the whole request and no servlet is needed.

What do you want to achieve? Note that if you want to run some method on a servlet you might get unexpected results as servlets are shared between multiple concurrent requests. You’ll probably need some sort of indirection, like storing a request or session attribute in filter and retrieving it in servlet.

See also

• How to get ServletConfig object in Filter