spring mvc 返回方式:ModelAndView, Model, ModelMap, Map,View, String, void
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AnnotationMethodHandlerAdapter和RequestMappingHandlerAdapter将使用BindingAwareModelMap作为模型对象的实现,即此处我们的形参(Model model, Map model2, ModelMap model3)都是同一个BindingAwareModelMap实例。AnnotationMethodHandlerAdapter和RequestMappingHandl