DispatcherServlet处理器的适配和处理解析

    protected HandlerAdapter getHandlerAdapter(Object handler) throws ServletException {
        if (this.handlerAdapters != null) {
            for (HandlerAdapter adapter : this.handlerAdapters) {
                if (adapter.supports(handler)) {
                    return adapter;
                }
            }
        }
        throw new ServletException("No adapter for handler [" + handler +
                "]: The DispatcherServlet configuration needs to include a HandlerAdapter that supports this handler");
    }

    @Override
    public final boolean supports(Object handler) {
        return (handler instanceof HandlerMethod && supportsInternal((HandlerMethod) handler));
    }
    @Override
    protected boolean supportsInternal(HandlerMethod handlerMethod) {
        return true;
    }

    @Override
    public boolean supports(Object handler) {
        return (handler instanceof HttpRequestHandler);
    }

    @Override
    public boolean supports(Object handler) {
        return (handler instanceof Controller);
    }

mv = ha.handle(processedRequest, response, mappedHandler.getHandler());

    @Override
    @Nullable
    public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        ((HttpRequestHandler) handler).handleRequest(request, response);
        return null;
    }

    @Override
    @Nullable
    public ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        return ((Controller) handler).handleRequest(request, response);
    }

    @Override
    @Nullable
    public final ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        return handleInternal(request, response, (HandlerMethod) handler);
    }

@Override
    protected ModelAndView handleInternal(HttpServletRequest request,
            HttpServletResponse response, HandlerMethod handlerMethod) throws Exception {
        ModelAndView mav;
        ...
        mav = invokeHandlerMethod(request, response, handlerMethod);//      
        ...
        prepareResponse(response);
        ...
        return mav;
    }

@Nullable
    protected ModelAndView invokeHandlerMethod(HttpServletRequest request,
            HttpServletResponse response, HandlerMethod handlerMethod) throws Exception {
        //先封装一个
        ServletWebRequest webRequest = new ServletWebRequest(request, response);
        try {
            WebDataBinderFactory binderFactory = getDataBinderFactory(handlerMethod);//数据绑定工厂
            ModelFactory modelFactory = getModelFactory(handlerMethod, binderFactory);//模型工厂
            //进行handlerMethod封装
            ServletInvocableHandlerMethod invocableMethod = createInvocableHandlerMethod(handlerMethod);
            if (this.argumentResolvers != null) {//设置参数解析器
                invocableMethod.setHandlerMethodArgumentResolvers(this.argumentResolvers);
            }
            if (this.returnValueHandlers != null) {//设置返回类型解析器
                invocableMethod.setHandlerMethodReturnValueHandlers(this.returnValueHandlers);
            }
            invocableMethod.setDataBinderFactory(binderFactory);//绑定工厂
            invocableMethod.setParameterNameDiscoverer(this.parameterNameDiscoverer);//参数名探测器
            //创建ModelAndView容器
            ModelAndViewContainer mavContainer = new ModelAndViewContainer();
            mavContainer.addAllAttributes(RequestContextUtils.getInputFlashMap(request));//获取前面重定向来的属性
            modelFactory.initModel(webRequest, mavContainer, invocableMethod);//初始化模型
            mavContainer.setIgnoreDefaultModelOnRedirect(this.ignoreDefaultModelOnRedirect);
            ...
            //调用处理方法
            invocableMethod.invokeAndHandle(webRequest, mavContainer);
            ...
            return getModelAndView(mavContainer, modelFactory, webRequest);
        }
        finally {
            webRequest.requestCompleted();
        }