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SUBSCRIBE TO RAM N JAVAIntroduction to Servlet Filters in Spring Boot
Imagine a security guard standing at the entrance of a building. They check every person entering or leaving to ensure everything is safe. In the world of web applications, Servlet Filters do exactly that!
What is a Servlet Filter?
A Filter is an object that performs filtering tasks on either the request to a resource (like a servlet or static content), or on the response from a resource, or both.
In Spring Boot, filters are used to intercept HTTP requests before they reach your controllers. This is perfect for cross-cutting concerns like:
- Logging request details (IP address, time, etc.)
- Authentication and Authorization
- Data Compression
- Encryption/Decryption
How It Works: The "Chain" Concept
Filters work in a "chain." When a request comes in, it passes through Filter A, then Filter B, and finally reaches your application. When the response is sent back, it travels back through the chain in reverse order.
Basic Implementation
Creating a filter in Spring Boot is as simple as implementing the Filter interface and marking it as a @Component.
public class MyFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ... ) {
// Logic before the request hits the controller
chain.doFilter(request, response);
// Logic after the controller completes
}
}
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