controller

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping(value = "/fileUpload")
    @ResponseBody
    public String uploadSkuImage(@RequestParam("fileName") MultipartFile file){
        return fileManager.uploadFile(file);
    }

http客户端请求

###
POST http://localhost:9004/fileUpload
Cache-Control: no-cache
Content-Type: multipart/form-data; boundary=WebAppBoundary

--WebAppBoundary
Content-Disposition: form-data; name="fileName"; filename="3.jpg"
Content-Type: multipart/form-data

< C:\Users\大都督\Pictures\Camera Roll\3.jpg
--WebAppBoundary--

解析对应关系