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案例1–Lists.partition

Lists.partition（）

    private void updateStatus(List<WsapModel> wsapModelList) {if (CollectionUtils.isEmpty(wsapModelList)) {return;}try {List<List<WsapModel>> partList = Lists.partition(wsapModelList, 1000);for (int i = 0; i < partList.size(); i++) {List<WsapModel> list = partList.get(i);List<Long> idlist = list.stream().map(WsapModel::getId).collect(Collectors.toList());personalSubscribeWsapMapper.updateStatus(idlist, LocalDateTime.now());}} catch (Exception e) {logger.error("更新t_personal_subscribe_wsap status为1 异常：{} >>{}", DateUtils.getNow(),e.getMessage());}}

案例2 --while 循环

while (true){

}

while (true) {try {goodsMediaDetailExportVOList = getGoodsMediaDetailExportVOList(goodsMediaDetailRepDTO, goodsMediaVO, goodsMediaDetailListApiRes);log.info("查询物媒视图参数：{}，条数：{}", goodsMediaDetailRepDTO, goodsMediaDetailExportVOList.size());            if (CollUtil.isNotEmpty(goodsMediaDetailExportVOList)) {totalRow = totalRow + goodsMediaDetailExportVOList.size();listLists = getExportData(goodsMediaDetailExportVOList);if (totalRow % fileRowSize == 0) {fileIndex++;fileName = "物媒明细数据报表" + fileIndex + ".csv";path = syncExportDTO.getExportFilePath(downLoadFolder) + fileName;fileNames.add(path);ExportUtil.writeCsvFile(fileName, headerList, path, listLists, false);} else {ExportUtil.writeCsvFile(fileName, new ArrayList<>(), path, listLists, true);}} else {break;}} catch (Exception e) {log.error("物媒明细数据报表异常", e);}}

while (!CollectionUtils.isEmpty(detailList)) {

}

    private final Integer BATCH_SIZE = 1000;queryWrapper.last("limit " + BATCH_SIZE);List<ActivityListApplyDetailModel> detailList = activityListApplyDetailMapper.selectList(queryWrapper);int finallyTransferCount = 0;while (!CollectionUtils.isEmpty(detailList)) {// 将数据插入到迁移表activityListApplyDetailMapper.newInsertBatchTransfer(tableName, detailList);// 删除已迁移的数据List<Long> detailIdList = detailList.stream().map(ActivityListApplyDetailModel::getId).collect(Collectors.toList());activityListApplyDetailMapper.deleteBatchIds(detailIdList);finallyTransferCount += detailList.size();log.info("报名明细迁移已完成迁移量：{}", finallyTransferCount);detailList = activityListApplyDetailMapper.selectList(queryWrapper);}

while (true) 配合分页插件

            int pageNum = 1, pageSize = 1000;long count = 0;while (true) {pageQuery.setPageNum(pageNum);pageQuery.setPageSize(pageSize);List<GoodsMediaModel> goodsMediaModelList = PageHelperUtil.listByPage(() -> goodsMediaMapper.selectList(queryWrapper), pageQuery).getLists();// 统计总数count += goodsMediaModelList.size();// 写入文件FileLineHelper.appendWrite(file, parseToString(goodsMediaModelList, specifyDate));if (goodsMediaModelList.size() < pageSize)break;elsepageNum++;}

案例3-- do while

do{ } while (!CollectionUtils.isEmpty());

   int pageNo = 1;int pageSize = 1000;PageBean<PersonalMediaDetailRespDTO> pageBean = null;do {// ck查询客户明细try {ApiResponse<PageBean<PersonalMediaDetailRespDTO>> pageBeanApiResponse = viewFeign.selectPersonalMediaViewDetailList(viewDetailRequestDTO);pageBean = pageBeanApiResponse.getData();if (pageBean == null || CollectionUtils.isEmpty(pageBean.getLists())) {if (pageNo == 1) {log.warn("【人媒明细报表导出】查询浏览事件为空");List<List<Object>> dataList = Lists.newArrayList();List<Object> data = Lists.newArrayList("未查找到符合条件的数据，请修改查询条件");dataList.add(data);ExportUtil.writeCsvFile(fileName, null, path, dataList, true);}break;}} catch (Exception e) {log.error("【人媒明细报表导出】，统计view汇总，请求参数：{}, 错误信息：", JSONObject.toJSONString(viewDetailRequestDTO), e);break;}List<PersonalMediaDetailRespDTO> viewDetailRespDTOList = pageBean.getLists();pageNo++;viewDetailRequestDTO.setPageNum(pageNo);} while (!CollectionUtils.isEmpty(pageBean.getLists()));

do{

if (CollectionUtils.isEmpty())) {

break;

}

} while ()

    @Overridepublic List<ChannelOrgDTO> selectActiveChannelList(String date) {List<ChannelOrgDTO> result = Lists.newArrayList();long pageCount;int pageNum = 0;PageQuery pageQuery = new PageQuery();pageQuery.setPageSize(5000);do {pageNum++;pageQuery.setPageNum(pageNum);PageBean<ChannelOrgDTO> page =PageHelperUtil.listByPage(() -> channelMapper.selectActiveChannelList(date), pageQuery);if (CollectionUtils.isEmpty(page.getLists())) {break;}result.addAll(page.getLists());pageCount = page.getPageCount();} while (pageCount > pageNum);return result;}