1、将excel文件放项目resources目录下

2、打包的时候排除指定后缀文件，否则打包时会出现文件损坏的情况

 <configuration>

   <encoding>UTF-8</encoding>

   <nonFilteredFileExtensions>

   <nonFilteredFileExtension>xls</nonFilteredFileExtension>

   <nonFilteredFileExtension>xlsx</nonFilteredFileExtension>

   </nonFilteredFileExtensions>

</configuration>

3、resource配置

<resources>

            <resource>

                <directory>src/main/resources</directory>

                <filtering>true</filtering>

                <includes>

                    <include>**/*.properties</include>

                    <include>**/*.xml</include>

                    <include>**/*.xlsx</include>

                </includes>

            </resource>

        </resources>

4、读取resources下的xlsx文件

 try {

            //获取模板文件

            File sourceFile = ResourceUtils.getFile("classpath:bankNameTemplate.xlsx");

            //转换为文件流

            BufferedInputStream fs = new BufferedInputStream(new FileInputStream(sourceFile));

            //指定默认下载名称

            String fileName = "XXX.xlsx";

            //配置response的头

            response.reset();

            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");

            try {

                response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));

            } catch (UnsupportedEncodingException e) {

                e.printStackTrace();

            }

            //循环从文件中读出数据后写出，完成下载

            byte[] b = new byte[1024];

            int len;

            while ((len = fs.read(b)) != -1) {

                response.getOutputStream().write(b, 0, len);

            }

            fs.close();

        } catch (Exception e) {

            logger.error("下载Excel模板异常", e);

        }

5.前端请求

　　window.location.href = "/exportExcelTemplate";