下载工程resources目录下的模板excel文件

一、添加依赖

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>5.1.0</version>
</dependency>

二、编写接口

@GetMapping("/downloadTemplate")public void downloadTemplate(HttpServletRequest request,HttpServletResponse response){String fileName = "template"+File.separator+"字段标准导入模板.xlsx";InputStream is = ClassLoader.getSystemResourceAsStream(fileName);response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");response.setCharacterEncoding("utf-8");Workbook wb = null;try {wb = new XSSFWorkbook(is);} catch (IOException e) {throw new RuntimeException(e);}try {wb.write(response.getOutputStream());} catch (Exception e) {log.error("下载导入模板异常{}", e.getMessage());} finally {IOUtils.closeQuietly(wb);if(is!=null){try {is.close();} catch (IOException e) {throw new RuntimeException(e);}}}}

三、这种代码，在windows上调试没问题，打成jar包发到linux环境上会有问题，改成如下代码就行：

@GetMapping("/downloadTemplate")public void downloadTemplate(HttpServletRequest request,HttpServletResponse response){String fileName = "template"+File.separator+"ColumnStandardImportTemplate.xlsx";response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");response.setCharacterEncoding("utf-8");try (InputStream is = new ClassPathResource(fileName).getInputStream();Workbook wb = new XSSFWorkbook(is);ServletOutputStream os = response.getOutputStream()) {wb.write(os);os.flush();} catch (Exception e) {log.error("下载导入模板异常", e);}}