So sánh filter servlet và interceptor năm 2024
A filter performs filtering tasks on either the request to a resource (a servlet or static content), or on the response from a resource, or both. Every Filter has access to a FilterConfig object from which it can obtain its initialization parameters, a reference to the ServletContext which it can use. The servlet container calls the init method exactly once after instantiating the filter. The init method must complete successfully before the filter is asked to do any filtering work. Filter performs the filtering operation in the The Some of the use cases where we can use filters are: 1. Authentication 2. Logging and Auditing 3. Image conversion 4. Data compression 5. Encryption What is Handler Interceptor?A HandlerInterceptor gets called before the appropriate HandlerAdapter triggers the execution of the handler itself. This mechanism can be used for a large field of preprocessing aspects, e.g. for authorization checks, or common handler behavior like locale or theme changes. Its main purpose is to allow for factoring out repetitive handler code. HandlerInterceptor is very similar to Servlet Filter, but it just allows custom pre-processing with the option of prohibiting the execution of the handler itself, and custom post-processing. Filters are more powerful, as they allow for exchanging the… Looking to compare Spring Interceptors and Filters? This ultimate comparison guide will help you understand the pros and cons of each and how they impact the execution flow of your Spring Boot application. ContextWhen building Spring Boot applications, it’s common to come across the terms “interceptor” and “filter”. Both are used for intercepting requests and responses in the application, but there are some key differences between the two. In this blog post, we’ll explore the difference between Spring Interceptors and Filters. Spring Interceptors are used to intercept requests and responses at the controller level. They are executed before the controller method is invoked and after the controller method has returned. This means that you can modify the request or response before it reaches the controller or after it has been processed by the controller. Interceptors are typically used for:
Spring Interceptors are implemented using the HandlerInterceptor interface. This interface defines three methods:
FiltersFilters, on the other hand, are used to intercept requests and responses at the servlet level. They are executed before the request reaches the servlet and after the response has been generated. Filters can be used to modify the request or response or to perform some other action on the request or response. Filters are typically used for:
Filters are implemented using the
Key DifferencesThe key difference between Spring Interceptors and Filters is the level at which they operate. Interceptors operate at the controller level, while Filters operate at the servlet level. This means that Interceptors have access to the controller and can modify the model and view, while Filters do not have access to the controller and can only modify the request and response. Another difference is the order in which they are executed. Interceptors are executed before and after the controller method, while Filters are executed before and after the servlet. This means that Interceptors have more fine-grained control over the request and response, while Filters have more general control over the request and response. Sr. No.AspectSpring InterceptorsFilters1.Level of operationController levelServlet level2.AccessAccess to controllerNo access to controller3.Execution orderBefore/after controller methodBefore/after servlet4.Defined inSpring FrameworkServlet specification5.InterfaceHandlerInterceptorjakarta.servlet.FilterSpring Interceptors vs Filters Request Execution Flow
ConclusionIn summary, Spring Interceptors and Filters are both used for intercepting requests and responses in web applications. Interceptors operate at the controller level, while Filters operate at the servlet level. Interceptors have more fine-grained control over the request and response, while Filters have more general control over the request and response. Both Interceptors and Filters are useful tools for customizing and enhancing web applications, and it’s important to understand the differences between them when choosing which to use in your application. |