A Servlet filter is an object that can intercept HTTP requests targeted at your web application. A servlet filter can intercept requests both for servlets, JSP’s, HTML files or other static content, as illustrated in the diagram below: A Servlet Filter in a Java Web Application.

Why do we need a servlet filter?

Why do we have Servlet Filter? … Servlet Filters are pluggable java components that we can use to intercept and process requests before they are sent to servlets and response after servlet code is finished and before container sends the response back to the client.

What is the difference between filter and servlet?

Filter provides functionality which can be “attached” to any web resource. Servlet used for performing action which needs for particular request as user login, get response based on user role, interacts with database for getting data, business logic execution, and more.