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29 changes: 29 additions & 0 deletions framework-docs/modules/ROOT/pages/web/webmvc/filters.adoc
Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,35 @@ Servlet filters can be configured in the `web.xml` configuration file or using S
If you are using Spring Boot, you can
{spring-boot-docs}/how-to/webserver.html#howto.webserver.add-servlet-filter-listener.spring-bean[declare them as beans and configure them as part of your application].

In addition to the built-in filters, you can also create custom filters by implementing the standard
`javax.servlet.Filter` interface or extending one of Spring's convenient base classes:

* `GenericFilterBean` – Useful when you need access to Spring-managed beans or the application context.
* `OncePerRequestFilter` – Ensures a single execution per request, even for asynchronous or error dispatches.

These base classes simplify filter development and offer integration with Spring's `ApplicationContext`.

For example:

[source,java]
----
public class MyFilter extends OncePerRequestFilter {

@Override
protected void doFilterInternal(HttpServletRequest request,
HttpServletResponse response,
FilterChain filterChain)
throws ServletException, IOException {
// Pre-processing logic
System.out.println("Processing request: " + request.getRequestURI());

filterChain.doFilter(request, response);

// Post-processing logic
}
}
----


[[filters-http-put]]
== Form Data
Expand Down