Spring MVC Interceptors & Filters Deep Dive | preHandle, postHandle, afterCompletion
Java Spring Boot Interview Q21 !!
In this video, we explore filters and interceptors in Spring Boot — from the DispatcherServlet to HandlerInterceptor — and see how they shape request handling in Spring MVC.
You’ll learn the difference between a servlet filter and an interceptor in Spring Boot, how the filter chain works, and how to implement PreHandle, PostHandle, and AfterCompletion methods.
This video also includes a conceptual overview of an Authentication interceptor and a RequestCounterInterceptor.
What You’ll Learn:
1) What is DispatcherServlet in Spring Boot & Spring MVC
2) Filters in Spring Boot & how the filter chain works
3) Filter vs Interceptor in Spring Boot
4) HandlerInterceptor in Spring Boot (example included)
5) PreHandle, PostHandle, AfterCompletion explained with differences
6) Authentication with Spring Boot interceptor
7) Request Interceptor implementation
8) Real-Life Use Cases: Filters vs Interceptors
Whether you’re learning about servlet filters, Spring Boot interceptors, or authentication, this video is your complete guide to mastering request processing in Spring Boot.
00:00 : Introduction
01:04 : Interceptor vs Filter
01:31 : HTTP API Request Flow Diagram
04:08 : Interview Points to Remember
04:48 : Filter Syntax : Hands-On !
07:21 : Filters Real Life Examples
17:53 : Interceptor Syntax : Hands-On !
21:51 : Interceptor Real Life Examples
30:18 : afterCompletion() method
33:41 : Interview Tip of the Day !
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