Question

I’d like to know, inside a Filter doFilter method, whenever a request is for a mapped servlet in my web.xml. Is there anyway to do so?

Thanks in advance,

Fernando

Answer 1

That can’t be done. Better map the filter on those servlets directly. This can be done by using <servlet-name> instead of <url-pattern>. It has to be exactly that <servlet-name> which is definied in the <servlet> entries. You can specify multiple if you need.

<filter-mapping>
    <filter-name>myFilter</filter-name>
    <servlet-name>myOneServlet</servlet-name>
    <servlet-name>myOtherServlet</servlet-name>
    <servlet-name>myLastServlet</servlet-name>
</filter-mapping>

Or when you’re already on Java EE 6 /Servlet 3.0 and are thus likely using @WebFilter on the class.

@WebFilter(servletNames={"myOneServlet", "myOtherServlet", "myLastServlet"})