controller

@GetMapping("/download/excel")  
@Operation(summary = "下載技術(shù)引入Excel模板")  
public void downloadTemplateExcel(HttpServletResponse response) {  
    technologyService.getTechnologyExcelModel(response);  
}

service

public void getTechnologyExcelModel(HttpServletResponse response) {  
    List<TechnologyImportExcelDto> technologyImportExcelDtoList = getTechnologyImportExcelVOList();  
    File file;  
    try {  
        //使用臨時(shí)文件  
        file = File.createTempFile("開源技術(shù)導(dǎo)入模板", ".xlsx");  
        FileOutputStream fileOutputStream = new FileOutputStream(file);  
        ExportParams params = new ExportParams("表格標(biāo)題", "Sheet1", ExcelType.XSSF);  
        String tipsMessage = "開源技術(shù)導(dǎo)入需遵循以下規(guī)則：xxx";  
        params.setTitle(tipsMessage);  
  
        Workbook workbook = ExcelExportUtil.exportExcel(params, TechnologyImportExcelDto.class, technologyImportExcelDtoList);  
  
        // 獲取Sheet對(duì)象  
        Sheet sheet = workbook.getSheetAt(0); // 只有一個(gè)Sheet  
  
        // 設(shè)置標(biāo)題行樣式  
        Row titleRow = sheet.getRow(0); // 標(biāo)題在第一行  
  
        CellStyle titleStyle = workbook.createCellStyle();  
        titleStyle.setAlignment(HorizontalAlignment.LEFT); // 設(shè)置水平對(duì)齊方式為左對(duì)齊  
        titleStyle.setVerticalAlignment(VerticalAlignment.CENTER); // 設(shè)置垂直對(duì)齊方式為居中  
        titleStyle.setWrapText(true); // 設(shè)置文本自動(dòng)換行  
  
        // 設(shè)置邊框  
        titleStyle.setBorderBottom(BorderStyle.THIN);  
        titleStyle.setBorderTop(BorderStyle.THIN);  
        titleStyle.setBorderLeft(BorderStyle.THIN);  
        titleStyle.setBorderRight(BorderStyle.THIN);  
  
        // 設(shè)置標(biāo)題行每個(gè)單元格的樣式  
        for (Cell cell : titleRow) {  
            cell.setCellStyle(titleStyle);  
        }  
  
        // 設(shè)置行高  
        titleRow.setHeightInPoints(titleRow.getHeightInPoints() * 4); // 設(shè)置為五行字的高度  
  
        // 設(shè)置字體加粗  
        Font font = workbook.createFont();  
        font.setBold(true);  
        titleStyle.setFont(font);  
  
        workbook.write(fileOutputStream);  
        fileOutputStream.close();  
        workbook.close();  
    } catch (IOException e) {  
        throw new RuntimeException(e);  
    }  
    //下載，讀取文件流并將其添加到response的輸出流中，同時(shí)設(shè)置響應(yīng)的Header字段  
    try (InputStream inputStream = new FileInputStream(file);  
         //獲取response的輸出流對(duì)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<TechnologyImportExcelDto> getTechnologyImportExcelVOList() {  
    List<TechnologyImportExcelDto> technologyImportExcelDtoList = new ArrayList<>();  
    TechnologyImportExcelDto technologyImportExcelDto = new TechnologyImportExcelDto(  
            "系統(tǒng)軟件/固件",  
            "模板", 
            "x",  
            "1.0.0",  
            "GPL-2.0",  
            "http://xx.com",  
            "5",  
            "2023-03-15 14:17:02",  
            "http://download.com",  
            "描述內(nèi)容");  
    technologyImportExcelDtoList.add(technologyImportExcelDto);  
    return technologyImportExcelDtoList;  
}

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