文章目录
- 前言
- 版本说明
- 测试 Demo
- 1、自定义过滤器 DemoFilter
- 2、自定义业务异常 ServiceException
- 3、自定义异常处理类 DemoExceptionHandler
- 4、DemoController
- 5、请求测试
- 问题分析
- 1、日志打印记录
- 2、Debug 方法
- 解决方案
- 1、修改自定义过滤器
- 2、请求测试
- 解决方案分析
- 1、日志打印记录
- 2、Debug 方法
- 对比总结
- 扩展
- Filter、Interceptor、ControllerAdvice、Aspect 执行顺序
- 附录
- 附录1：直接抛出异常的详细日志
前言
最近在开发过滤器功能的时候遇到一个有趣的问题：
在 FilterChain#doFilter 方法之前抛出了一个异常，但是这个异常无法被异常处理器捕获，需要使用 HandlerExceptionResolver 来处理异常。
因此本文来分析一下这个问题。
版本说明
本文使用的版本如下：
Spring Boot：v3.1.5Lombok：v1.18.26Hutool：v5.8.15
测试 Demo
Demo 打成了压缩包（在文章开头）可以自行下载使用。
1、自定义过滤器 DemoFilter
2、自定义业务异常 ServiceException
3、自定义异常处理类 DemoExceptionHandler
4、DemoController
5、请求测试
请求 URL：
http://localhost:8080/hello
请求结果：
返回了错误码 500，且错误信息是：
{"timestamp": "2023-11-26T03:43:07.655+00:00","status": 500,"error": "Internal Server Error","path": "/hello"
}
这里并没有返回理想中的结果：
在自定义异常处理器重定义的错误码是 400，返回信息应该是 ServiceException: / by zero。
问题分析
1、日志打印记录
根据日志的打印结果来 Debug 分析一下整个流程：
2023-11-26T11:49:25.841+08:00 INFO 5748 --- [ XNIO-1 task-2] space.zlyx.demo.mvc.filter.DemoFilter : DemoFilterBefore: 在请求经过过滤器之前的操作
2023-11-26T11:49:25.842+08:00 ERROR 5748 --- [ XNIO-1 task-2] io.undertow.request : UT005023: Exception handling request to /hellospace.zlyx.demo.mvc.exception.ServiceException: ServiceException: / by zero
# 省略详细报错（完整日志可查看文末附录）2023-11-26T11:49:25.842+08:00 DEBUG 5748 --- [ XNIO-1 task-2] o.s.web.servlet.DispatcherServlet : "ERROR" dispatch for GET "/error", parameters={}
2023-11-26T11:49:25.843+08:00 DEBUG 5748 --- [ XNIO-1 task-2] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#error(HttpServletRequest)
2023-11-26T11:49:25.843+08:00 DEBUG 5748 --- [ XNIO-1 task-2] o.s.w.s.m.m.a.HttpEntityMethodProcessor : Using 'application/json', given [*/*] and supported [application/json, application/*+json]
2023-11-26T11:49:25.844+08:00 DEBUG 5748 --- [ XNIO-1 task-2] o.s.w.s.m.m.a.HttpEntityMethodProcessor : Writing [{timestamp=Sun Nov 26 11:49:25 CST 2023, status=500, error=Internal Server Error, path=/hello}]
2023-11-26T11:49:25.845+08:00 DEBUG 5748 --- [ XNIO-1 task-2] o.s.web.servlet.DispatcherServlet : Exiting from "ERROR" dispatch, status 500
日志信息可以看出异常抛出之后没有进入异常处理器，直接就写出了。
2、Debug 方法
org.springframework.web.servlet.DispatcherServlet#doService
org.springframework.web.servlet.DispatcherServlet#logRequest
org.springframework.web.servlet.DispatcherServlet#doDispatch
// Actually invoke the handler.
mv = ha.handle(processedRequest, response, mappedHandler.getHandler());
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod#invokeAndHandle
org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor#handleReturnValue
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor#writeWithMessageConverters
解决方案
1、修改自定义过滤器
在自定义过滤器中使用 HandlerExceptionResolver 处理异常信息：
2、请求测试
请求 URL：
http://localhost:8080/hello
请求结果：
修改之后返回了正确的错误信息以及错误码。
解决方案分析
1、日志打印记录
2023-11-26T13:02:11.053+08:00 INFO 11220 --- [ XNIO-1 task-2] space.zlyx.demo.mvc.filter.DemoFilter : DemoFilterBefore: 在请求经过过滤器之前的操作
2023-11-26T13:02:11.053+08:00 DEBUG 11220 --- [ XNIO-1 task-2] .m.m.a.ExceptionHandlerExceptionResolver : Using @ExceptionHandler space.zlyx.demo.mvc.handler.DemoExceptionHandler#handleServiceException(ServiceException, HttpServletRequest)
2023-11-26T13:02:11.054+08:00 ERROR 11220 --- [ XNIO-1 task-2] s.z.d.mvc.handler.DemoExceptionHandler : 业务异常捕获：Filter ServiceException: / by zero
2023-11-26T13:02:11.054+08:00 DEBUG 11220 --- [ XNIO-1 task-2] m.m.a.RequestResponseBodyMethodProcessor : Using 'text/plain', given [*/*] and supported [text/plain, */*, application/json, application/*+json]
2023-11-26T13:02:11.054+08:00 DEBUG 11220 --- [ XNIO-1 task-2] m.m.a.RequestResponseBodyMethodProcessor : Writing ["Filter ServiceException: / by zero"]
2023-11-26T13:02:11.055+08:00 DEBUG 11220 --- [ XNIO-1 task-2] .m.m.a.ExceptionHandlerExceptionResolver : Resolved [ServiceException(code=null, message=Filter ServiceException: / by zero)]
2023-11-26T13:02:11.055+08:00 DEBUG 11220 --- [ XNIO-1 task-2] o.s.web.servlet.DispatcherServlet : GET "/hello", parameters={}
2023-11-26T13:02:11.055+08:00 DEBUG 11220 --- [ XNIO-1 task-2] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to space.zlyx.demo.mvc.controller.DemoController#hello(HttpServletRequest, HttpServletResponse)
2023-11-26T13:02:11.055+08:00 INFO 11220 --- [ XNIO-1 task-2] s.z.demo.mvc.controller.DemoController : DemoController hello
2023-11-26T13:02:11.055+08:00 DEBUG 11220 --- [ XNIO-1 task-2] m.m.a.RequestResponseBodyMethodProcessor : Found 'Content-Type:text/plain;charset=UTF-8' in response
2023-11-26T13:02:11.055+08:00 DEBUG 11220 --- [ XNIO-1 task-2] m.m.a.RequestResponseBodyMethodProcessor : Writing ["Hello World"]
2023-11-26T13:02:11.056+08:00 DEBUG 11220 --- [ XNIO-1 task-2] o.s.web.servlet.DispatcherServlet : Completed 400 BAD_REQUEST
2023-11-26T13:02:11.056+08:00 INFO 11220 --- [ XNIO-1 task-2] space.zlyx.demo.mvc.filter.DemoFilter : DemoFilterAfter: 在请求经过过滤器之后的操作
2、Debug 方法
org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#doResolveHandlerMethodException
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod#invokeAndHandle
DemoExceptionHandler#handleServiceException
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor#handleReturnValue
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor#writeWithMessageConverters
对比总结
经过两种不同的方式的调用对比，可以得出以下结论：
- 在
FilterChain#doFilter之前直接抛出异常，则过滤器链中断，抛出异常之后结果由HttpEntityMethodProcessor进行处理。 - 使用
HandlerExceptionResolver#resolveException方法，异常会被ExceptionHandlerExceptionResolver进行处理，此时能够被异常拦截器捕获，最终返回的结果由RequestResponseBodyMethodProcessor进行处理。 - 使用
HandlerExceptionResolver时，因为过滤器链没有中断，因此内部会继续执行 controller 方法，但是请求结果已经提前输出了。
扩展
Filter、Interceptor、ControllerAdvice、Aspect 执行顺序
在没有异常的情况下，各组件调用顺序如下（不包含 ControllerAdvice）：
- FilterChain#doFilter 之前
- Interceptor#preHandle
- Aspect#before
- Controller
- Aspect#afterReturning
- Aspect#after
- Interceptor#postHandle
- Interceptor#afterCompletion
- FilterChain#doFilter 之后
在本文基础上顺便测试了一下 Interceptor 以及 Aspect，并在各个组件中抛出异常，得到的结果如下：
注：ControllerAdvice 即异常处理器
| 异常位置 | 异常抛出方式 | 调用方法 |
|---|---|---|
| Filter | HandlerExceptionResolver | FilterChain#doFilter 之前（异常） ControllerAdvice Interceptor#preHandle Aspect#before Controller Aspect#afterReturning Aspect#after Interceptor#postHandle Interceptor#afterCompletion FilterChain#doFilter 之后 |
| Interceptor | 直接抛异常 | FilterChain#doFilter 之前 Interceptor#preHandle（异常） ControllerAdvice FilterChain#doFilter 之后 |
| Aspect | 直接抛异常 | FilterChain#doFilter 之前 Interceptor#preHandle Aspect#before（异常） ControllerAdvice Interceptor#afterCompletion FilterChain#doFilter 之后 |
| Controller | 直接抛异常 | FilterChain#doFilter 之前 Interceptor#preHandle Aspect#before Controller（异常） Aspect#afterThrowing Aspect#after ControllerAdvice Interceptor#afterCompletion FilterChain#doFilter 之后 |
请求进入执行顺序：
Filter —— Interceptor —— Aspect —— Controller
异常抛出执行顺序：
Controller —— Aspect —— ControllerAdvice —— Interceptor —— Filter
附录
附录1：直接抛出异常的详细日志
2023-11-26T11:49:25.841+08:00 INFO 5748 --- [ XNIO-1 task-2] space.zlyx.demo.mvc.filter.DemoFilter : DemoFilterBefore: 在请求经过过滤器之前的操作
2023-11-26T11:49:25.842+08:00 ERROR 5748 --- [ XNIO-1 task-2] io.undertow.request : UT005023: Exception handling request to /hellospace.zlyx.demo.mvc.exception.ServiceException: ServiceException: / by zeroat space.zlyx.demo.mvc.filter.DemoFilter.doFilter(DemoFilter.java:40) ~[classes/:na]at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:67) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.0.13.jar:6.0.13]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.13.jar:6.0.13]at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:67) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.0.13.jar:6.0.13]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.13.jar:6.0.13]at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:67) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.0.13.jar:6.0.13]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.0.13.jar:6.0.13]at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:67) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:117) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.3.10.Final.jar:2.3.10.Final]at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) ~[undertow-core-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) ~[undertow-core-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) ~[undertow-core-2.3.10.Final.jar:2.3.10.Final]at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.SendErrorPageHandler.handleRequest(SendErrorPageHandler.java:52) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) ~[undertow-core-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:276) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:132) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:256) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:101) ~[undertow-servlet-2.3.10.Final.jar:2.3.10.Final]at io.undertow.server.Connectors.executeRootHandler(Connectors.java:393) ~[undertow-core-2.3.10.Final.jar:2.3.10.Final]at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:859) ~[undertow-core-2.3.10.Final.jar:2.3.10.Final]at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18) ~[jboss-threads-3.5.0.Final.jar:3.5.0.Final]at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2513) ~[jboss-threads-3.5.0.Final.jar:3.5.0.Final]at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1538) ~[jboss-threads-3.5.0.Final.jar:3.5.0.Final]at org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1282) ~[xnio-api-3.8.8.Final.jar:3.8.8.Final]at java.base/java.lang.Thread.run(Thread.java:833) ~[na:na]2023-11-26T11:49:25.842+08:00 DEBUG 5748 --- [ XNIO-1 task-2] o.s.web.servlet.DispatcherServlet : "ERROR" dispatch for GET "/error", parameters={}
2023-11-26T11:49:25.843+08:00 DEBUG 5748 --- [ XNIO-1 task-2] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController#error(HttpServletRequest)
2023-11-26T11:49:25.843+08:00 DEBUG 5748 --- [ XNIO-1 task-2] o.s.w.s.m.m.a.HttpEntityMethodProcessor : Using 'application/json', given [*/*] and supported [application/json, application/*+json]
2023-11-26T11:49:25.844+08:00 DEBUG 5748 --- [ XNIO-1 task-2] o.s.w.s.m.m.a.HttpEntityMethodProcessor : Writing [{timestamp=Sun Nov 26 11:49:25 CST 2023, status=500, error=Internal Server Error, path=/hello}]
2023-11-26T11:49:25.845+08:00 DEBUG 5748 --- [ XNIO-1 task-2] o.s.web.servlet.DispatcherServlet : Exiting from "ERROR" dispatch, status 500
