解决Springboot打包后下载文件内容为空_springboot 下载excel模板 文件内容丢失

	/**
	 * 根据文件名下载模板
	 *
	 * @param response
	 * @param fileName
	 */
	@Override
	public void downloadTemplate(HttpServletResponse response, String fileName) {
		OutputStream os = null;
		InputStream is = null;
		try {
			InputStream inputStream = this.getClass().getResourceAsStream("/template/" + fileName);
			File somethingFile = File.createTempFile("template", ".xlsx");
			try {
				FileUtils.copyInputStreamToFile(inputStream, somethingFile);
			} finally {
				inputStream.close();
			}
			InputStream in = new FileInputStream(somethingFile);
			// 取得输出流
			os = response.getOutputStream();
			response.setContentType("application/vnd.ms-excel");
			response.setHeader("Content-Disposition", "attachment;filename=1.xlsx");
			//复制
			IOUtils.copy(in, response.getOutputStream());
			response.getOutputStream().flush();
		} catch (IOException e) {
			System.out.println("下载文件失败，" + e.getMessage());
		} finally {
			try {
				if (is != null) {
					is.close();
				}
			} catch (IOException e) {
			}
			try {
				if (os != null) {
					os.close();
				}
			} catch (IOException e) {
			}
		}
	}
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