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);
        }
    }