SpringMVC涉及关键组件

Servlet扩展
    Servlet
    ServletConfig
    GenericServlet
    HttpServlet

初始化组件：
    HttpServletBean
    FrameworkServlet
    DispatcherServlet

九大组件：
    HandlerMapping
    HandlerAdapter
    ViewResolver
    RequestToViewNameTranslator
    HandlerExceptionResolver
    MultipartResolver
    LocaleResolver
    ThemeResolver
    FlashMapManager
    
异步执行
    AsyncWebRequest
    WebAsyncManager
    WebAsyncUtils