关于视图渲染

在doDispatch中通过handleradapter进行视图渲染 返回mv

/**
     * This implementation expects the handler to be an {@link HandlerMethod}.
     */
    @Override
    @Nullable
    public final ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {

        return handleInternal(request, response, (HandlerMethod) handler);
    }

内部调用了handlerInternal让子类来处理

/**
     * Use the given handler method to handle the request.
     * @param request current HTTP request
     * @param response current HTTP response
     * @param handlerMethod handler method to use. This object must have previously been passed to the
     * {@link #supportsInternal(HandlerMethod)} this interface, which must have returned {@code true}.
     * @return ModelAndView object with the name of the view and the required model data,
     * or {@code null} if the request has been handled directly
     * @throws Exception in case of errors
     */
    @Nullable
    protected abstract ModelAndView handleInternal(HttpServletRequest request,
            HttpServletResponse response, HandlerMethod handlerMethod) throws Exception;

意思是使用给定handler的方法去处理request。