DataBinder数据绑定器的继承结构

Object (java.lang)
	DataBinder (org.springframework.validation)
		WebDataBinder (org.springframework.web.bind)
			MapDataBinder (org.springframework.data.web)
			ServletRequestDataBinder (org.springframework.web.bind)
				ExtendedServletRequestDataBinder (org.springframework.web.servlet.mvc.method.annotation)
			WebExchangeDataBinder (org.springframework.web.bind.support)
			WebRequestDataBinder (org.springframework.web.bind.support)

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