1.原始模板

2.导出模板,下拉框为数据库中得到动态数据

public void downloadTemplate(HttpServletResponse response) throws IOException {// 所有部门List<String, String> departments = expertManageMapper.selectAllDepartment();//所有职位List<String, String> posts = expertManageMapper.selectAllPost();//所有级别List<String, String> levels = expertManageMapper.selectAllLevel();// 创建或读取已有的Excel模板InputStream templateFileStream = new ClassPathResource("/templates/excel/expert_template.xlsx").getInputStream();Workbook workbook = new XSSFWorkbook(templateFileStream);Sheet sheet = workbook.getSheetAt(0);DataValidationHelper validationHelper = sheet.getDataValidationHelper();// 工作表的第二行索引int firstRowNum = 1;// 工作表的最后一行索引int lastRowNum = 10000;//添加需要校验的单元格，startCol和endCol根据模板中列进行修改// 科室校验applyDataValidation(validationHelper, sheet, addressList(firstRowNum, lastRowNum, 3, 3), ArrayUtils.toArray(departments));// 职位校验applyDataValidation(validationHelper, sheet, addressList(firstRowNum, lastRowNum, 4, 4),ArrayUtils.toArray(posts));// 等级校验applyDataValidation(validationHelper, sheet, addressList(firstRowNum, lastRowNum, 5, 5), ArrayUtils.toArray(levels));// 设置响应头信息response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");String encodedFilename = UriUtils.encode("专家信息录入模板.xlsx", StandardCharsets.UTF_8);response.setHeader("Content-Disposition", "attachment;filename*=UTF-8''" + encodedFilename);try (ServletOutputStream outputStream = response.getOutputStream()) {// 将修改后的Excel内容写入到输出流workbook.write(outputStream);} finally {workbook.close();}}/*** 简化创建和应用数据验证的过程*/private void applyDataValidation(DataValidationHelper validationHelper, Sheet sheet, CellRangeAddressList addressList, String[] validationData) {if (validationData.length > 0) {DataValidationConstraint constraint = validationHelper.createExplicitListConstraint(validationData);DataValidation validation = validationHelper.createValidation(constraint, addressList);sheet.addValidationData(validation);}}/*** 创建CellRangeAddressList*/private CellRangeAddressList addressList(int startRow, int endRow, int startCol, int endCol) {return new CellRangeAddressList(startRow, endRow, startCol, endCol);}