若依excel工具类导出excel模板数据带下拉映射

导出模板代码，原理是combo属性 传递一个数组 里面是label下拉数组。

    @Overridepublic void downloadTemplate(HttpServletResponse response) {ExcelUtil<ThMachineryManageExcel> util = new ExcelUtil<>(ThMachineryManageExcel.class);List<SysDistrictExcel> districtExcelCache = DistrictUtils.getDistrictExcelCache();String[] array = districtExcelCache.stream().map(SysDistrictExcel::getName).toArray(String[]::new);util.combo("districtCode", array);util.importTemplateExcel(response, "数据模板");}

导入代码映射逻辑 util.readConverterExp 映射数据，数据结构是String类型多个逗号隔开：label=value

  @Overridepublic R<?> importData(MultipartFile file) throws IOException {ExcelUtil<ThMachineryManageExcel> util = new ExcelUtil<>(ThMachineryManageExcel.class);List<SysDistrictExcel> districtExcelCache = DistrictUtils.getDistrictExcelCache();Map<String, SysDistrictExcel> districtMap = districtExcelCache.stream().collect(Collectors.toMap(SysDistrictExcel::getCode, district -> district));String readConverterExp = districtExcelCache.stream().map(district -> district.getCode() + "=" + district.getName()).collect(Collectors.joining(","));// 映射数据label和value        util.readConverterExp("districtCode", readConverterExp);List<ThMachineryManageExcel> excelList = util.importExcel(file.getInputStream());if (ObjectUtil.isEmpty(excelList)){throw new ServiceException("导入数据不能为空！");}List<ThMachineryManage> saveOrUpdateList = new ArrayList<>();int successNum = 0;int updateNum = 0;int errorNum = 0;StringBuilder successMsg = new StringBuilder();for (ThMachineryManageExcel data : excelList){try {ThMachineryManage topic = BeanUtil.copyProperties(data, ThMachineryManage.class);//校验基本数据BeanValidators.validateWithException(validator,topic);ThMachineryManage oneData = getOne(new LambdaQueryWrapper<ThMachineryManage>().eq(ThMachineryManage::getBrand, data.getBrand()));//校验通过 开始检测数据是否重复if (ObjectUtil.isNotNull(oneData)){//说明是更新数据topic.setId(oneData.getId());updateNum++;}else {successNum++;}SysDistrictExcel sysDistrictExcel = districtMap.get(data.getDistrictCode());//业务逻辑  存储行政区更多的数据topic.setCountyCode(sysDistrictExcel.getCountyCode());topic.setTownCode(sysDistrictExcel.getTownCode());topic.setVillageCode(sysDistrictExcel.getVillageCode());topic.setDistrictLevel("2");topic.setDistrictName(sysDistrictExcel.getName());saveOrUpdateList.add(topic);}catch (Exception e){errorNum++;int count = excelList.indexOf(data);String message = e.getMessage();successMsg.append("第").append(count+1).append("条数据导入失败，原因：").append(message).append(";");break;}}// 数据全部正确时 进行批量插入/更新if (!saveOrUpdateList.isEmpty()&&errorNum==0){super.saveOrUpdateBatch(saveOrUpdateList);if (successNum>0){successMsg.append("成功导入").append(successNum).append("条数据");}if (updateNum>0){successMsg.append("成功更新").append(updateNum).append("条数据");}return R.ok(successMsg.toString());}else {return R.fail(successMsg.toString());}}