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());
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