org.apache.catalina.connector.RequestFacade cannot be cast to org.springframework.web.multipart

ajax提交，做文件上传时，由于上传的文件是另一台服务器，报错

MultipartHttpServletRequest multipartHttpServletRequest = (MultipartHttpServletRequest) request;

解决办法：

MultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());
        MultipartHttpServletRequest multipartRequest = resolver.resolveMultipart(request);