Spring mvc 启动 和 请求分发

Spring mvc 启动 和 请求分发
启动加载：
abstract class HttpServletBean extends HttpServlet
void init()
initServletBean();

abstract class FrameworkServlet extends HttpServletBean
void initServletBean()
WebApplicationContext initWebApplicationContext()
onRefresh(wac);

class DispatcherServlet extends FrameworkServlet
void onRefresh(ApplicationContext context)
void initStrategies(ApplicationContext context)

initMultipartResolver(context);
initLocaleResolver(context);
initThemeResolver(context);
initHandlerMappings(context);
initHandlerAdapters(context);
initHandlerExceptionResolvers(context);
initRequestToViewNameTranslator(context);
initViewResolvers(context);
initFlashMapManager(context);

请求分发：
HTTP request-->httpServlet
--->class FrameworkServlet ---->doPost() or doGet()

processRequest(HttpServletRequest request, HttpServletResponse response)
doService(request, response);

class DispatcherServlet extends FrameworkServlet
void doService(HttpServletRequest request, HttpServletResponse response)
doDispatch(request, response);

// Actually invoke the handler.
mv = ha.handle(processedRequest, response, mappedHandler.getHandler());

SimpleControllerHandlerAdapter implements HandlerAdapter

ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
((Controller) handler).handleRequest(request, response);

用户在使用时，实现了 AbstractController.handleRequestInternal（）
或者    重写 Controller handleRequest（）

ha 使用哪个Adapter ？ 一般需要在配置文件中写明
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>

下面这个文件中会自动加载
/org/springframework/web/servlet/DispatcherServlet.properties

org.springframework.web.servlet.HandlerMapping=org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping,\
org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping

org.springframework.web.servlet.HandlerAdapter=org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter,\
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter,\
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter