How to Register Custom Filters in Spring Boot using FilterRegistrationBean?

How to Add a Custom Filter in Spring Boot

Spring Boot, a popular framework for building web applications, offers the flexibility to extend the functionality of web applications using filters. This guide will delve into the use of FilterRegistrationBean to register custom filters and provide practical examples for implementation.

If you are seeking to add a custom filter to your Spring Boot project, FilterRegistrationBean provides a straightforward mechanism to achieve this. It acts as a container for registering filters and configuring their behavior within the Spring Boot application.

Here's how to use FilterRegistrationBean to register a custom filter:

1. Create the Filter Class: Define a class that extends javax.servlet.Filter and implement its doFilter() method. Implement the custom logic for filtering requests and responses within this method.
2. Configure FilterRegistrationBean: In your @Configuration class, create a method annotated with @Bean for the FilterRegistrationBean. Within this method:

• Set the filter property to an instance of the custom filter class created in Step 1.
• Add desired URL patterns using the addUrlPatterns() method to specify which URLs the filter should apply to.
• Use the addInitParameter() method if any initialization parameters are needed for the filter.
• Provide a name for the filter using the setName() method.
• Set the order property to specify the execution order of the filter relative to other registered filters.

3. Excluding Filter Paths: If you want to exclude certain paths from the filter's application, use the addExcludedPatterns() method in FilterRegistrationBean to specify the paths to exclude.

With FilterRegistrationBean, you have the flexibility to create and register custom filters in Spring Boot applications, allowing you to modify requests and responses before reaching resource handlers. These custom filters provide a convenient way to implement security measures, handle request mapping, perform logging, and more.

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