java设置可供下载的excel模板文件

controller

@GetMapping("/download/excel")  
@Operation(summary = "下载技术引入Excel模板")  
public void downloadTemplateExcel(HttpServletResponse response) {  
    technologyService.getTechnologyExcelModel(response);  
}

service

public void getTechnologyExcelModel(HttpServletResponse response) {  
    List technologyImportExcelDtoList = getTechnologyImportExcelVOList();  
    File file;  
    try {  
        //使用临时文件  
        file = File.createTempFile("开源技术导入模板", ".xlsx");  
        FileOutputStream fileOutputStream = new FileOutputStream(file);  
        ExportParams params = new ExportParams("表格标题", "Sheet1", ExcelType.XSSF);  
        String tipsMessage = "开源技术导入需遵循以下规则：xxx";  
        params.setTitle(tipsMessage);  
  
        Workbook workbook = ExcelExportUtil.exportExcel(params, TechnologyImportExcelDto.class, technologyImportExcelDtoList);  
  
        // 获取Sheet对象  
        Sheet sheet = workbook.getSheetAt(0); // 只有一个Sheet  
  
        // 设置标题行样式  
        Row titleRow = sheet.getRow(0); // 标题在第一行  
  
        CellStyle titleStyle = workbook.createCellStyle();  
        titleStyle.setAlignment(HorizontalAlignment.LEFT); // 设置水平对齐方式为左对齐  
        titleStyle.setVerticalAlignment(VerticalAlignment.CENTER); // 设置垂直对齐方式为居中  
        titleStyle.setWrapText(true); // 设置文本自动换行  
  
        // 设置边框  
        titleStyle.setBorderBottom(BorderStyle.THIN);  
        titleStyle.setBorderTop(BorderStyle.THIN);  
        titleStyle.setBorderLeft(BorderStyle.THIN);  
        titleStyle.setBorderRight(BorderStyle.THIN);  
  
        // 设置标题行每个单元格的样式  
        for (Cell cell : titleRow) {  
            cell.setCellStyle(titleStyle);  
        }  
  
        // 设置行高  
        titleRow.setHeightInPoints(titleRow.getHeightInPoints() * 4); // 设置为五行字的高度  
  
        // 设置字体加粗  
        Font font = workbook.createFont();  
        font.setBold(true);  
        titleStyle.setFont(font);  
  
        workbook.write(fileOutputStream);  
        fileOutputStream.close();  
        workbook.close();  
    } catch (IOException e) {  
        throw new RuntimeException(e);  
    }  
    //下载，读取文件流并将其添加到response的输出流中，同时设置响应的Header字段  
    try (InputStream inputStream = new FileInputStream(file);  
         //获取response的输出流对象  
         OutputStream outputStream = response.getOutputStream()) {  
        response.setContentType("application/octet-stream");  
        response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(file.getName(), StandardCharsets.UTF_8));  
        response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");  
        IOUtils.copy(inputStream, outputStream);  
        outputStream.flush();  
    } catch (Exception e) {  
        throw new RuntimeException();  
    } finally {  
        //清除文件  
        file.delete();  
    }  
}

@NotNull  
private static List getTechnologyImportExcelVOList() {  
    List technologyImportExcelDtoList = new ArrayList<>();  
    TechnologyImportExcelDto technologyImportExcelDto = new TechnologyImportExcelDto(  
            "系统软件/固件",  
            "模板", 
            "x",  
            "1.0.0",  
            "GPL-2.0",  
            "http://xx.com",  
            "5",  
            "2023-03-15 14:17:02",  
            "http://download.com",  
            "描述内容");  
    technologyImportExcelDtoList.add(technologyImportExcelDto);  
    return technologyImportExcelDtoList;  
}