Multiple Servlet Filter Ordering
We can specify the order of execution of servlet filters in the Deployment Descriptor. However, in Spring Boot, we can do it in a much easier way by using @Order Annotation.
Java
//Methods with Annotation for Multiple-Filter // Authorization Filter (1st Filter) // Executed 1st @Order(1) @Componentpublic class AuthorizationFilter implements Filter { // Code for 1st Filter } // Logging Filter (2nd Filter) // Executed 2nd @Order(2) @Componentpublic class LoggingFilter implements Filter { // Code for 2nd Filter } // Debug Filter (3rd Filter) // Executed 3rd @Order(3) @Componentpublic class DebugFilter implements Filter { // Code for 3rd Filter } |
The above code demonstrates how the ordering of filters can be specified easily in Spring Boot using @Order Annotation.
- The AuthorizationFilter will execute first, then filterChain.doFilter() method will call the next filter that is, LoggingFilter, and so on until all the filters are executed in a chained fashion.
Order of Execution
Spring Boot – Servlet Filter
Spring boot Servlet Filter is a component used to intercept & manipulate HTTP requests and responses. Servlet filters help in performing pre-processing & post-processing tasks such as:
- Logging and Auditing: Logging operations can be performed by the servlet filter logging the request and response which assists in debugging and troubleshooting.
- Authentication and Authorization: Authentication and Authorization refer to the process of providing access and checking if a user has certain privilege permissions to access a resource
- Caching: Caching is a mechanism that allows us to store data temporarily for faster access in the future. It can be done by caching response in servlet filters.
- Routing: Servlet filters can also be used for routing responses to different controllers giving us more control over handling requests
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