1.上传方式一定要选择POST，参数写在body的form-data中，key类型选择File
2.设置POSTMAN上传附件的路径：
File--->Settings--->General--->working directory--->Location设置上传图片所在的位置
注：这一步一定要操作，否则会报错如下：
This file isn't in your working directory. Teammates you share this request with won't be able to use
需要上传的图片所在路径