当使用<mvc:annotation-driven/>
这个标签在spring mvc的配置文件中时,spring mvc xml对应的解析类会自动注入容器中。AnnotationDrivenBeanDefinitionParser
@Override
@Nullable
public BeanDefinition parse(Element element, ParserContext parserContext) {
...
// Ensure BeanNameUrlHandlerMapping (SPR-8289) and default HandlerAdapters are not "turned off"
MvcNamespaceUtils.registerDefaultComponents(parserContext, source);
}