java8的flatmap

List<String>  resultList = wmPoiLogisticsSubmitRequestDTOList.stream()
         .flatMap(wmPoiLogisticsSubmitRequestDTOTemp -> wmPoiLogisticsSubmitRequestDTOTemp.getLogisticsList().stream())
         .filter(wmPoiLogisticsDTO -> "333333".equals(wmPoiLogisticsDTO.getLogisticsCode()) ||  "111111".equals(wmPoiLogisticsDTO.getLogisticsCode()) )
         .map(wmPoiLogisticsDTO -> wmPoiLogisticsDTO.getName() )
         .collect(Collectors.toList());