java 根据excel模板下载excel文件

public void downBatchFileExcel(@PathVariable(value = "batchId") String batchId) throws Exception
    {
        if(StringUtils.isEmpty(batchId))
        {
            throw new IllegalArgumentException("参数为空！");
        }

        ResourceBatchInfo batchInfo = resourceBatchUploadInfoService.selectByPrimaryKey(batchId);
        
        if(null == batchInfo || StringUtils.isEmpty(batchInfo.getFileDir()))
        {
            throw new IllegalArgumentException("批次信息为空！");
        }
        
        File dirFile = new File(batchInfo.getFileDir());
        if(null == dirFile || !dirFile.exists())
        {
            throw new IllegalArgumentException("目录不存在！");
        }
        
        List<FileInfo> fileInfoList = new ArrayList<FileInfo>();
        Path startingDir = Paths.get(batchInfo.getFileDir());
        try (Stream<Path> paths = Files.walk(startingDir)) 
        {
            paths
                .filter(Files::isRegularFile)
                .forEach(path -> 
                {
                    System.out.println("name=" + path.getFileName().toString() + ", path = " + path.toString());

                    FileInfo fileInfo = new FileInfo();
                    fileInfo.setFileName(path.getFileName().toString());
                    fileInfo.setLocalPath(path.toString());
                    fileInfoList.add(fileInfo);
                });
            
            if(fileInfoList.size() == 0)
            {
                throw new IllegalArgumentException("文件信息为空！");
            }
            
            String templatePath = "/home/jhedu/template/file_list.xlsx"; // Excel模板路径
            
            Workbook workbook = new XSSFWorkbook(templatePath);
            Sheet sheet = workbook.getSheetAt(0); // 获取第一个Sheet
              
             // 遍历数据并填充到Excel模板中对应的位置
            if(fileInfoList.size() > 0)
            {
                for(int i=0; i<fileInfoList.size(); i++)
                {
                     Row row = sheet.createRow(i + 2); // 从第3行开始填充数据，假设第一行是标题行
                     for (int j = 0; j < 6; j++) 
                     {
                         Cell cell = row.createCell(j);
                         if(j == 0)
                         {
                             cell.setCellValue(fileInfoList.get(i).getFileName());
                         }
                         else if(j == 7)
                         {
                             cell.setCellValue(fileInfoList.get(i).getLocalPath());
                         }
                     }
                }
            }

            String fileName = "filelist_" + batchId + ".xlsx";
            // 设置响应内容类型
            response.setContentType("application/vnd.ms-excel");
            // 设置响应头
            response.setHeader("Content-Disposition", "attachment;filename=\"" + fileName + "\"");

            // 获取输出流
            OutputStream out = response.getOutputStream();
            // 将工作簿写入输出流
            workbook.write(out);
            out.flush();
            out.close();
            workbook.close();
        } 
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }