springmvc的工作原理（原创）

DispathcerServler继承FrameworkServlet FrameworkServlet 继承HttpServletBean HttpServletBean 继承 HttpServlet实现EnvironmentAware接口

容器启动首先执行HttpServletBean的init方法 init方法将执行FrameworkServlet的initServletBean方法

FrameworkServlet的initServletBean方法将 初始化webapplicationContext this.webApplicationContext = initWebApplicationContext();

initWebApplicationContext方法将判断容器是否启动，否则将 wac = createWebApplicationContext(rootContext);

createWebApplicationContext方法里将configureAndRefreshWebApplicationContext(wac);

接着在configure...方法里面添加 wac.addApplicationListener(new SourceFilteringListener(wac, new ContextRefreshListener()));

private class ContextRefreshListener implements ApplicationListener<ContextRefreshedEvent> {

  public void onApplicationEvent(ContextRefreshedEvent event) {    FrameworkServlet.this.onApplicationEvent(event);   }  }

上面的方法将添加Listener后，监听ContextRefreshListener，然后出发onApplicationEvent启动DispatherServlet的onRefresh方法

@Override  protected void onRefresh(ApplicationContext context) {   initStrategies(context);  }

initStrategies将初始化springmvc

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