说在前面

本次主要介绍springmvc配置解析。

springmvc配置解析

本次介绍MvcNamespaceHandler。

进入到这个方法org.springframework.web.servlet.config.ResourcesBeanDefinitionParser#parse

@Override   public BeanDefinition parse(Element element, ParserContext context) {      Object source = context.extractSource(element);//    注册url服务处理器 ->      registerUrlProvider(context, source);//    注册路径匹配器bean定义 ->      RuntimeBeanReference pathMatcherRef = MvcNamespaceUtils.registerPathMatcher(null, context, source);//    注册url路径匹配器bean定义 ->      RuntimeBeanReference pathHelperRef = MvcNamespaceUtils.registerUrlPathHelper(null, context, source);//    注册resourceHandler ->      String resourceHandlerName = registerResourceHandler(context, element, pathHelperRef, source);      if (resourceHandlerName == null) {         return null;      }      Map
    
      urlMap = new ManagedMap
     
      ();//    解析映射      String resourceRequestPath = element.getAttribute("mapping");      if (!StringUtils.hasText(resourceRequestPath)) {         context.getReaderContext().error("The 'mapping' attribute is required.", context.extractSource(element));         return null;      }      urlMap.put(resourceRequestPath, resourceHandlerName);//    注册SimpleUrlHandlerMapping bean定义      RootBeanDefinition handlerMappingDef = new RootBeanDefinition(SimpleUrlHandlerMapping.class);      handlerMappingDef.setSource(source);      handlerMappingDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);      handlerMappingDef.getPropertyValues().add("urlMap", urlMap);      handlerMappingDef.getPropertyValues().add("pathMatcher", pathMatcherRef).add("urlPathHelper", pathHelperRef);//    解析顺序属性      String orderValue = element.getAttribute("order");      // Use a default of near-lowest precedence, still allowing for even lower precedence in other mappings      Object order = StringUtils.hasText(orderValue) ? orderValue : Ordered.LOWEST_PRECEDENCE - 1;      handlerMappingDef.getPropertyValues().add("order", order);//    注册跨域bean支持bean定义 ->      RuntimeBeanReference corsRef = MvcNamespaceUtils.registerCorsConfigurations(null, context, source);      handlerMappingDef.getPropertyValues().add("corsConfigurations", corsRef);      String beanName = context.getReaderContext().generateBeanName(handlerMappingDef);      context.getRegistry().registerBeanDefinition(beanName, handlerMappingDef);      context.registerComponent(new BeanComponentDefinition(handlerMappingDef, beanName));      // Ensure BeanNameUrlHandlerMapping (SPR-8289) and default HandlerAdapters are not "turned off"      // Register HttpRequestHandlerAdapter 注册默认组件 ->      MvcNamespaceUtils.registerDefaultComponents(context, source);      return null;   }
     
    

进入到这个方法org.springframework.web.servlet.config.ResourcesBeanDefinitionParser#registerUrlProvider

private void registerUrlProvider(ParserContext context, Object source) {      if (!context.getRegistry().containsBeanDefinition(RESOURCE_URL_PROVIDER)) {         RootBeanDefinition urlProvider = new RootBeanDefinition(ResourceUrlProvider.class);         urlProvider.setSource(source);         urlProvider.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);         context.getRegistry().registerBeanDefinition(RESOURCE_URL_PROVIDER, urlProvider);//       注册mvcResourceUrlProvider bean定义         context.registerComponent(new BeanComponentDefinition(urlProvider, RESOURCE_URL_PROVIDER));//       注册ResourceUrlProviderExposingInterceptor bean定义         RootBeanDefinition interceptor = new RootBeanDefinition(ResourceUrlProviderExposingInterceptor.class);         interceptor.setSource(source);         interceptor.getConstructorArgumentValues().addIndexedArgumentValue(0, urlProvider);//       注册MappedInterceptor bean定义         RootBeanDefinition mappedInterceptor = new RootBeanDefinition(MappedInterceptor.class);         mappedInterceptor.setSource(source);         mappedInterceptor.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);         mappedInterceptor.getConstructorArgumentValues().addIndexedArgumentValue(0, (Object) null);         mappedInterceptor.getConstructorArgumentValues().addIndexedArgumentValue(1, interceptor);         String mappedInterceptorName = context.getReaderContext().registerWithGeneratedName(mappedInterceptor);         context.registerComponent(new BeanComponentDefinition(mappedInterceptor, mappedInterceptorName));      }   }

往上返回到这个方法org.springframework.web.servlet.config.MvcNamespaceUtils#registerPathMatcher

public static RuntimeBeanReference registerPathMatcher(         RuntimeBeanReference pathMatcherRef, ParserContext parserContext, Object source) {      if (pathMatcherRef != null) {         if (parserContext.getRegistry().isAlias(PATH_MATCHER_BEAN_NAME)) {            parserContext.getRegistry().removeAlias(PATH_MATCHER_BEAN_NAME);         }//       注册别名mvcPathMatcher         parserContext.getRegistry().registerAlias(pathMatcherRef.getBeanName(), PATH_MATCHER_BEAN_NAME);      }      else if (!parserContext.getRegistry().isAlias(PATH_MATCHER_BEAN_NAME)            && !parserContext.getRegistry().containsBeanDefinition(PATH_MATCHER_BEAN_NAME)) {         RootBeanDefinition pathMatcherDef = new RootBeanDefinition(AntPathMatcher.class);         pathMatcherDef.setSource(source);         pathMatcherDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);//       注册mvcPathMatcher bean定义         parserContext.getRegistry().registerBeanDefinition(PATH_MATCHER_BEAN_NAME, pathMatcherDef);         parserContext.registerComponent(new BeanComponentDefinition(pathMatcherDef, PATH_MATCHER_BEAN_NAME));      }      return new RuntimeBeanReference(PATH_MATCHER_BEAN_NAME);   }

往上返回到这个方法org.springframework.web.servlet.config.MvcNamespaceUtils#registerUrlPathHelper

public static RuntimeBeanReference registerUrlPathHelper(         RuntimeBeanReference urlPathHelperRef, ParserContext parserContext, Object source) {      if (urlPathHelperRef != null) {         if (parserContext.getRegistry().isAlias(URL_PATH_HELPER_BEAN_NAME)) {            parserContext.getRegistry().removeAlias(URL_PATH_HELPER_BEAN_NAME);         }//       注册mvcUrlPathHelper别名         parserContext.getRegistry().registerAlias(urlPathHelperRef.getBeanName(), URL_PATH_HELPER_BEAN_NAME);      }      else if (!parserContext.getRegistry().isAlias(URL_PATH_HELPER_BEAN_NAME)            && !parserContext.getRegistry().containsBeanDefinition(URL_PATH_HELPER_BEAN_NAME)) {         RootBeanDefinition urlPathHelperDef = new RootBeanDefinition(UrlPathHelper.class);         urlPathHelperDef.setSource(source);         urlPathHelperDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);//       注册mvcUrlPathHelper bean定义         parserContext.getRegistry().registerBeanDefinition(URL_PATH_HELPER_BEAN_NAME, urlPathHelperDef);         parserContext.registerComponent(new BeanComponentDefinition(urlPathHelperDef, URL_PATH_HELPER_BEAN_NAME));      }      return new RuntimeBeanReference(URL_PATH_HELPER_BEAN_NAME);   }

往上返回到这个方法org.springframework.web.servlet.config.ResourcesBeanDefinitionParser#registerResourceHandler

private String registerResourceHandler(         ParserContext context, Element element, RuntimeBeanReference pathHelperRef, Object source) {//    解析location属性值      String locationAttr = element.getAttribute("location");      if (!StringUtils.hasText(locationAttr)) {         context.getReaderContext().error("The 'location' attribute is required.", context.extractSource(element));         return null;      }//    注册ResourceHttpRequestHandler bean定义      RootBeanDefinition resourceHandlerDef = new RootBeanDefinition(ResourceHttpRequestHandler.class);      resourceHandlerDef.setSource(source);      resourceHandlerDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);      MutablePropertyValues values = resourceHandlerDef.getPropertyValues();//    解析url路径解析器      values.add("urlPathHelper", pathHelperRef);//    解析路径值      values.add("locationValues", StringUtils.commaDelimitedListToStringArray(locationAttr));//    获取缓存周期      String cacheSeconds = element.getAttribute("cache-period");      if (StringUtils.hasText(cacheSeconds)) {         values.add("cacheSeconds", cacheSeconds);      }//    获取缓存配置      Element cacheControlElement = DomUtils.getChildElementByTagName(element, "cache-control");      if (cacheControlElement != null) {//       解析缓存配置 ->         CacheControl cacheControl = parseCacheControl(cacheControlElement);         values.add("cacheControl", cacheControl);      }//    获取资源域属性      Element resourceChainElement = DomUtils.getChildElementByTagName(element, "resource-chain");      if (resourceChainElement != null) {//       解析资源域 ->         parseResourceChain(resourceHandlerDef, context, resourceChainElement, source);      }//    获取媒体类型管理器 ->      Object manager = MvcNamespaceUtils.getContentNegotiationManager(context);      if (manager != null) {         values.add("contentNegotiationManager", manager);      }      String beanName = context.getReaderContext().generateBeanName(resourceHandlerDef);      context.getRegistry().registerBeanDefinition(beanName, resourceHandlerDef);      context.registerComponent(new BeanComponentDefinition(resourceHandlerDef, beanName));      return beanName;   }

进入到这个方法org.springframework.web.servlet.config.ResourcesBeanDefinitionParser#parseResourceChain

private void parseResourceChain(         RootBeanDefinition resourceHandlerDef, ParserContext context, Element element, Object source) {      String autoRegistration = element.getAttribute("auto-registration");      boolean isAutoRegistration = !(StringUtils.hasText(autoRegistration) && "false".equals(autoRegistration));      ManagedList

进入到这个方法org.springframework.web.servlet.config.ResourcesBeanDefinitionParser#parseResourceCache

private void parseResourceCache(ManagedList

往上返回到这个方法org.springframework.web.servlet.config.MvcNamespaceUtils#getContentNegotiationManager

public static Object getContentNegotiationManager(ParserContext context) {      String name = AnnotationDrivenBeanDefinitionParser.HANDLER_MAPPING_BEAN_NAME;      if (context.getRegistry().containsBeanDefinition(name)) {         BeanDefinition handlerMappingBeanDef = context.getRegistry().getBeanDefinition(name);//       从RequestMappingHandlerMapping bean定义中获取         return handlerMappingBeanDef.getPropertyValues().get("contentNegotiationManager");      }      name = AnnotationDrivenBeanDefinitionParser.CONTENT_NEGOTIATION_MANAGER_BEAN_NAME;      if (context.getRegistry().containsBeanDefinition(name)) {         return new RuntimeBeanReference(name);      }      return null;   }

往上返回到这个方法org.springframework.web.servlet.config.MvcNamespaceUtils#registerCorsConfigurations

public static RuntimeBeanReference registerCorsConfigurations(         Map
    
      corsConfigurations, ParserContext context, Object source) {//    mvcCorsConfigurations 跨域支持bean定义解析      if (!context.getRegistry().containsBeanDefinition(CORS_CONFIGURATION_BEAN_NAME)) {         RootBeanDefinition corsDef = new RootBeanDefinition(LinkedHashMap.class);         corsDef.setSource(source);         corsDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);         if (corsConfigurations != null) {            corsDef.getConstructorArgumentValues().addIndexedArgumentValue(0, corsConfigurations);         }//       注册mvcCorsConfigurations bean定义         context.getReaderContext().getRegistry().registerBeanDefinition(CORS_CONFIGURATION_BEAN_NAME, corsDef);         context.registerComponent(new BeanComponentDefinition(corsDef, CORS_CONFIGURATION_BEAN_NAME));      }      else if (corsConfigurations != null) {         BeanDefinition corsDef = context.getRegistry().getBeanDefinition(CORS_CONFIGURATION_BEAN_NAME);         corsDef.getConstructorArgumentValues().addIndexedArgumentValue(0, corsConfigurations);      }      return new RuntimeBeanReference(CORS_CONFIGURATION_BEAN_NAME);   }
    

往上返回到这个方法org.springframework.web.servlet.config.MvcNamespaceUtils#registerDefaultComponents

public static void registerDefaultComponents(ParserContext parserContext, Object source) {//    注册BeanNameUrlHandlerMapping bean定义 ->      registerBeanNameUrlHandlerMapping(parserContext, source);//    注册HttpRequestHandlerAdapter bean定义 ->      registerHttpRequestHandlerAdapter(parserContext, source);//    注册SimpleControllerHandlerAdapter bean定义 ->      registerSimpleControllerHandlerAdapter(parserContext, source);//    注册HandlerMappingIntrospector bean定义 ->      registerHandlerMappingIntrospector(parserContext, source);   }

这里前面解析过了。

往上返回到这个方法org.springframework.web.servlet.config.ResourcesBeanDefinitionParser#parse

说到最后

本次源码解析仅代表个人观点，仅供参考。