2023.03.20 SpringMVC源码解析

adapter.supports(handler)

HandlerFunctionAdapter

Http请求，从Tomcat到SpringMVC的调用栈

ServletWebServerApplicationContext#onRefresh时（ServletWebServerFactoryConfiguration$EmbeddedTomcat）创建tomcatServletWebServerFactory

加载DispatcherServlet的Beandefinition

FrameworkServlet

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StandardWrapper.allocate()

HttpServletBean

SimpleControllerHandlerAdapter

init()

主要用来获取web.xml中配置的filter中设置init-param的的值，然后在将这些值赋值给对配置的filter中的属性。

returnValueHandlers = {HandlerMethodReturnValueHandlerComposite@6208}  returnValueHandlers = {ArrayList@6209}  size = 15  0 = {ModelAndViewMethodReturnValueHandler@8071}   1 = {ModelMethodProcessor@6213}   2 = {ViewMethodReturnValueHandler@8072}   3 = {ResponseBodyEmitterReturnValueHandler@8073}   4 = {StreamingResponseBodyReturnValueHandler@8074}   5 = {HttpEntityMethodProcessor@8075}   6 = {HttpHeadersReturnValueHandler@8076}   7 = {CallableMethodReturnValueHandler@8077}   8 = {DeferredResultMethodReturnValueHandler@8078}   9 = {AsyncTaskMethodReturnValueHandler@8079}   10 = {ServletModelAttributeMethodProcessor@8080}   11 = {RequestResponseBodyMethodProcessor@8081}   12 = {ViewNameMethodReturnValueHandler@8082}   13 = {MapMethodProcessor@8083}   14 = {ServletModelAttributeMethodProcessor@8084}

DispatcherServlet

processedRequest = checkMultipart(request);

SpringMVC内置Filter

HttpServlet

resolvers = {HandlerMethodArgumentResolverComposite@7585}  argumentResolvers = {ArrayList@8098}  size = 27  0 = {RequestParamMethodArgumentResolver@8101}   1 = {RequestParamMapMethodArgumentResolver@8102}   2 = {PathVariableMethodArgumentResolver@8103}   3 = {PathVariableMapMethodArgumentResolver@8104}   4 = {MatrixVariableMethodArgumentResolver@8105}   5 = {MatrixVariableMapMethodArgumentResolver@8106}   6 = {ServletModelAttributeMethodProcessor@8107}   7 = {RequestResponseBodyMethodProcessor@8108}   8 = {RequestPartMethodArgumentResolver@8109}   9 = {RequestHeaderMethodArgumentResolver@8110}   10 = {RequestHeaderMapMethodArgumentResolver@8111}   11 = {ServletCookieValueMethodArgumentResolver@8112}   12 = {ExpressionValueMethodArgumentResolver@8113}   13 = {SessionAttributeMethodArgumentResolver@8114}   14 = {RequestAttributeMethodArgumentResolver@8115}   15 = {ServletRequestMethodArgumentResolver@8116}   16 = {ServletResponseMethodArgumentResolver@8117}   17 = {HttpEntityMethodProcessor@8118}   18 = {RedirectAttributesMethodArgumentResolver@8119}   19 = {ModelMethodProcessor@8120}   20 = {MapMethodProcessor@8121}   21 = {ErrorsMethodArgumentResolver@8122}   22 = {SessionStatusMethodArgumentResolver@8123}   23 = {UriComponentsBuilderMethodArgumentResolver@8124}   24 = {PrincipalMethodArgumentResolver@8125}   25 = {RequestParamMethodArgumentResolver@8126}   26 = {ServletModelAttributeMethodProcessor@8127}

// 参数解析InvocableHandlerMethod#getMethodArgumentValuesHandlerMethodArgumentResolverComposite#resolveArgumentHandlerMethodArgumentResolver#resolveArgumentHttpMessageConverter#read

OncePerRequestFilter

ViewResolver

SpringMVC源码解析版本 v5.3.25日期：2023.03.20

SimpleServletHandlerAdapter

// 入参是processedRequest，根据请求，获取Handler// 具体来说，是根据请求的path直接匹配出RequestMappingInfo。再根据request匹配RequestMappingInfo中的methodsCondition、paramsCondition、headersCondition、consumesCondition、producesCondition、pathPatternsCondition、patternsCondition、customConditionHolder等属性值，获得匹配的RequestMappingInfo，并根据规则，得到bestMatch的HandlerMethod。然后和HandlerInterceptor组装成HandlerExecutionChain。HandlerExecutionChain mappedHandler = getHandler(processedRequest);this.handlerMappings = {ArrayList@7321}  size = 5 0 = {RequestMappingHandlerMapping@9816}  1 = {BeanNameUrlHandlerMapping@9817}  2 = {RouterFunctionMapping@9818}  3 = {SimpleUrlHandlerMapping@8401}  4 = {WelcomePageHandlerMapping@9819}

接收到第一次Http请求

启动加载

servlet.init(facade)

onRefresh()-initStrategies()

converter.canWrite(）

initFrameworkServlet()

第一次请求时init初始化

handler instanceof HandlerFunction

保证每个filter只执行一次

RequestResponseBodyMethodProcessor

this.localeResolver.resolveLocale(request)

GenericFilterBean

protected void initStrategies(ApplicationContext context) {  initMultipartResolver(context);  initLocaleResolver(context);  initThemeResolver(context);  initHandlerMappings(context);  initHandlerAdapters(context);  initHandlerExceptionResolvers(context);  initRequestToViewNameTranslator(context);  initViewResolvers(context);  initFlashMapManager(context); }

// 获取支持Handler（HandlerMethod）的HandlerAdapterHandlerAdapter ha = getHandlerAdapter(mappedHandler.getHandler());adapter.supports(handler)this.handlerAdapters = {ArrayList@7322}  size = 4 0 = {RequestMappingHandlerAdapter@10607}  1 = {HandlerFunctionAdapter@10608}  2 = {HttpRequestHandlerAdapter@8295}  3 = {SimpleControllerHandlerAdapter@10609}

DispatcherServletRegistrationBean

请求处理

RequestMappingHandlerAdapter#invokeHandlerMethod

第一次请求时init初始化过程

handler instanceof HttpRequestHandler

AbstractHandlerMethodAdapter#supports(handler instanceof HandlerMethod && supportsInternal((HandlerMethod) handler))

HandlerAdapter

converter.write()

Servlet

使用自动配置加载流程，加载Beandefinition

ErrorPageCustomizer

Tomcat架构ApplicationFilterChain

HttpMessageConverter

handler instanceof Controller

initServletBean()

this.messageConverters = {ArrayList@7635}  size = 10 0 = {ByteArrayHttpMessageConverter@8011}  1 = {StringHttpMessageConverter@8015}  2 = {StringHttpMessageConverter@8016}  3 = {ResourceHttpMessageConverter@8017}  4 = {ResourceRegionHttpMessageConverter@8018}  5 = {SourceHttpMessageConverter@8019}  6 = {AllEncompassingFormHttpMessageConverter@8020}  7 = {MappingJackson2HttpMessageConverter@8021}  8 = {MappingJackson2HttpMessageConverter@8022}  9 = {Jaxb2RootElementHttpMessageConverter@8023}

GenericServlet

创建DispatcherServlet的bean

⭐️2023.04.23 SpringBoot自动配置源码解析https://www.processon.com/view/link/6444f93b84b4b71c14ff3fa3

CharacterEncodingFilterCommonsRequestLoggingFilterCorsFilterFormContentFilterForwardedHeaderFilterHiddenHttpMethodFilterHttpPutFormContentFilterMultipartFilterOrderedFormContentFilterRelativeRedirectFilterRequestContextFilterServletContextRequestLoggingFilterShallowEtagHeaderFilter

RequestMappingHandlerAdapter

HttpRequestHandlerAdapter

@InitBinder、@ModelAttribute

onRefresh()

handler instanceof Servlet

自动配置加载流程-DispatcherServlet1、启动时，根据以下时序图加载DispatcherServletAutoConfiguration2、DispatcherServletConfiguration中通过@Bean声明了DispatcherServlet3、此处仅通过构造方法创建了bean对象

ThemeResolver

this.viewResolvers = {ArrayList@6514}  size = 4 0 = {ContentNegotiatingViewResolver@8449}  1 = {BeanNameViewResolver@8454}  2 = {ViewResolverComposite@8455}  3 = {InternalResourceViewResolver@8456}

initWebApplicationContext()-configureAndRefreshWebApplicationContext()-onRefresh()

ErrorPageRegistrarBeanPostProcessor

Bean type ExplanationHandlerMapping \

FlashMapManager

MultipartResolver

HandlerExceptionResolver

HandlerMapping

核心组件

AbstractAutowireCapableBeanFactory#applyBeanPostProcessorsBeforeInitialization