springmvc源碼解析MvcNamespaceHandler之

 

說在前面

本次主要介紹springmvc配置解析。

 

springmvc配置解析

本次介紹MvcNamespaceHandler。

進入到這個方法org.springframework.web.servlet.config.InterceptorsBeanDefinitionParser#parse

@Override
   public BeanDefinition parse(Element element, ParserContext parserContext) {
      CompositeComponentDefinition compDefinition = new CompositeComponentDefinition(element.getTagName(), parserContext.extractSource(element));
      parserContext.pushContainingComponent(compDefinition);
      RuntimeBeanReference pathMatcherRef = null;
//    解析路徑適配器
      if (element.hasAttribute("path-matcher")) {
         pathMatcherRef = new RuntimeBeanReference(element.getAttribute("path-matcher"));
      }

      List<Element> interceptors = DomUtils.getChildElementsByTagName(element, "bean", "ref", "interceptor");
      for (Element interceptor : interceptors) {
         RootBeanDefinition mappedInterceptorDef = new RootBeanDefinition(MappedInterceptor.class);
         mappedInterceptorDef.setSource(parserContext.extractSource(interceptor));
         mappedInterceptorDef.setRole(BeanDefinition.ROLE_INFRASTRUCTURE);
         ManagedList<String> includePatterns = null;
         ManagedList<String> excludePatterns = null;
         Object interceptorBean;
//       註冊攔截器bean定義
         if ("interceptor".equals(interceptor.getLocalName())) {
//          包含路徑的適配器 ->
            includePatterns = getIncludePatterns(interceptor, "mapping");
//          包含路徑的映射路徑 ->
            excludePatterns = getIncludePatterns(interceptor, "exclude-mapping");
            Element beanElem = DomUtils.getChildElementsByTagName(interceptor, "bean", "ref").get(0);
            interceptorBean = parserContext.getDelegate().parsePropertySubElement(beanElem, null);
         }
         else {
            interceptorBean = parserContext.getDelegate().parsePropertySubElement(interceptor, null);
         }
         mappedInterceptorDef.getConstructorArgumentValues().addIndexedArgumentValue(0, includePatterns);
         mappedInterceptorDef.getConstructorArgumentValues().addIndexedArgumentValue(1, excludePatterns);
         mappedInterceptorDef.getConstructorArgumentValues().addIndexedArgumentValue(2, interceptorBean);
         if (pathMatcherRef != null) {
            mappedInterceptorDef.getPropertyValues().add("pathMatcher", pathMatcherRef);
         }

         String beanName = parserContext.getReaderContext().registerWithGeneratedName(mappedInterceptorDef);
         parserContext.registerComponent(new BeanComponentDefinition(mappedInterceptorDef, beanName));
      }

      parserContext.popAndRegisterContainingComponent();
      return null;
   }

 

說到最後

本次源碼解析僅表明我的觀點，僅供參考。