【java】使用multipartfile上传文件

https://blog.csdn.net/justry_deng/article/details/80855235
主要在于调用Multipartfile对象的transferTo(File)

下载文件

        response.setCharacterEncoding("utf-8");
        response.setContentType("multipart/form-data");
        response.setHeader("Content-Disposition",
                "attachment;fileName=" + FileUtils.setFileDownloadHeader(request, downloadName));
        FileUtils.writeBytes(downloadPath, response.getOutputStream());