1.前提
需要在
springboot中提前分别注册listener、filter、servlet、interceptor，代码可参考以下文章：
2.测试
本地访问http://localhost:8080/my,查看日志信息，如下：
2020-11-18 21:07:09.523 INFO 6536 --- [ost-startStop-1] com.xzl.spire.filter.MyFilter : MyFilter...init
2020-11-18 21:07:09.777 INFO 6536 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2020-11-18 21:07:10.065 INFO 6536 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@168660: startup date [Wed Nov 18 21:07:06 CST 2020]; root of context hierarchy
2020-11-18 21:07:10.150 INFO 6536 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/book],methods=[GET]}" onto public com.xzl.spire.model.Book com.xzl.spire.controller.BookController.book()
2020-11-18 21:07:10.152 INFO 6536 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/delete/{id}],methods=[POST]}" onto public java.lang.String com.xzl.spire.controller.BookController.deleteBook(java.lang.Long)
2020-11-18 21:07:10.154 INFO 6536 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/getUserById],methods=[GET]}" onto public java.lang.String com.xzl.spire.controller.UserController.getUserById(java.lang.Integer)
2020-11-18 21:07:10.154 INFO 6536 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/deleteUserById],methods=[GET]}" onto public void com.xzl.spire.controller.UserController.deleteUserById(java.lang.Integer)
2020-11-18 21:07:10.156 INFO 6536 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2020-11-18 21:07:10.156 INFO 6536 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2020-11-18 21:07:10.219 INFO 6536 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2020-11-18 21:07:10.219 INFO 6536 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2020-11-18 21:07:10.474 INFO 6536 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2020-11-18 21:07:10.515 INFO 6536 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2020-11-18 21:07:10.520 INFO 6536 --- [ main] com.xzl.spire.SpireApplication : Started SpireApplication in 4.597 seconds (JVM running for 8.211)
2020-11-18 21:09:18.635 INFO 6536 --- [nio-8080-exec-1] com.xzl.spire.listener.MyListener : MyListener...requestInitialized
2020-11-18 21:09:18.650 INFO 6536 --- [nio-8080-exec-1] com.xzl.spire.filter.MyFilter : MyFilter...doFilter
2020-11-18 21:09:18.651 INFO 6536 --- [nio-8080-exec-1] com.xzl.spire.servlet.MyServlet : doGet...
2020-11-18 21:09:18.662 INFO 6536 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2020-11-18 21:09:18.663 INFO 6536 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2020-11-18 21:09:18.687 INFO 6536 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 24 ms
2020-11-18 21:09:18.695 INFO 6536 --- [nio-8080-exec-1] com.xzl.spire.interceptor.MyInterceptor : MyInterceptor>>>preHandle
2020-11-18 21:09:18.731 INFO 6536 --- [nio-8080-exec-1] com.xzl.spire.interceptor.MyInterceptor : MyInterceptor>>>postHandle
2020-11-18 21:09:18.790 INFO 6536 --- [nio-8080-exec-1] com.xzl.spire.interceptor.MyInterceptor : MyInterceptor>>>afterCompletion
2020-11-18 21:09:18.815 INFO 6536 --- [nio-8080-exec-1] com.xzl.spire.listener.MyListener : MyListener...requestDestroyed
再down掉项目后，新产生的日志信息如下：
2020-11-18 21:31:20.558 INFO 6536 --- [ Thread-18] ConfigServletWebServerApplicationContext : Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@168660: startup date [Wed Nov 18 21:07:06 CST 2020]; root of context hierarchy
2020-11-18 21:31:20 JRebel: Reconfiguring bean 'myWebMvcConfig' [com.xzl.spire.config.MyWebMvcConfig$$EnhancerBySpringCGLIB$$5db458ff]
2020-11-18 21:31:20.889 INFO 6536 --- [ Thread-18] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2020-11-18 21:31:21.039 INFO 6536 --- [ost-startStop-2] com.xzl.spire.filter.MyFilter : MyFilter...destroy
3.结论
执行顺序如下：
1.项目 run时，filter开始init
2.浏览器发送get请求，listener开始init
3.filter执行doFilter方法
4.servlet执行doGet方法
5.interceptor开始依次执行preHandle、postHandle、afterCompletion方法
6.listener执行requestDestroyed方法,get请求结束
7.项目down掉，filter执行destroy方法
