文件放在resource下面

然后下载工具类代码：

@Slf4j
public class ExcelTemplateUtil {

    /**
     * 下载模板文件
     * @param response
     * @param inFileName
     * @param outFileNam
     */
    public void downloadExcel(HttpServletResponse response, String inFileName, String outFileNam) {
        InputStream inputStream = null;
        try {
            response.reset();
            //设置输出文件格式
            response.setContentType("application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" + new String(outFileNam.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1));
            ServletOutputStream outputStream = response.getOutputStream();
            inputStream = this.getClass().getResourceAsStream("/template/"+inFileName);
            byte[] buff = new byte[1024];
            int length;
            while ((length = inputStream.read(buff)) != -1) {
                outputStream.write(buff, 0, length);
            }
            if (outputStream != null) {
                outputStream.flush();
                outputStream.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (inputStream != null) {

                try {
                    inputStream.close();
                } catch (IOException e) {
                    log.error("关闭资源出错" + e.getMessage());
                    e.printStackTrace();
                }
            }
        }
    }
}

调用样例：

new ExcelTemplateUtil().downloadExcel(response, "sort.xlsx", "分类导入模板.xlsx");

 这样就会自动下载出来该模板文件