Stream的常用方法

• List 转 Map<String，T>

  Map<String, MesProductionPlanConfigDTO> dtoMap4MesProductionPlanConfig = dtoList4MesProductionPlanConfig.stream().collect(Collectors.toMap(MesProductionPlanConfigDTO::getId, v -> v, (v1, v2) -> v1));

• 单个字段排序

  List<MesProcessText> tmpSortAscList4MesProcessText = existList4MesProcessText.stream().sorted(Comparator.comparing(MesProcessText::getSort)).collect(Collectors.toList());

• 多字段排序

  Map<String, List<MesProductionPlanDayStationTimeDTO>> batchMap4MesProductionPlanDayStationTimeDTO = list4MesProductionPlanDayStationTimeDTO.stream().sorted(Comparator.comparing((MesProductionPlanDayStationTimeDTO day) -> day.getMesProductionPlan().getPlanStartTime()).thenComparing((MesProductionPlanDayStationTimeDTO day1) -> day1.getMesProductionPlan().getSortNum())).collect(Collectors.groupingBy(i -> i.getMesProductionPlan().getProductionBatchId(), LinkedHashMap::new, Collectors.toList()));

• List转Map<String,List>

  Map<String, List<MesProcessLevelConfig>> mesProcessLevelConfigLinkMap = list.stream().collect(Collectors.groupingBy(MesProcessLevelConfig::getMatMgtId, LinkedHashMap::new, Collectors.toList()));

• 提取Set

  Set<String> mesPrdOrdOptsIds = mesPrdOrdOptsList.stream().map(MesPrdOrdOpts::getId).collect(Collectors.toSet());

• List转多key的Map

  Map<String, Map<String, List<MesProcessTooling>>> existMapMapSortAscList4MesProcessTooling = existList4MesProcessTooling.stream().sorted(Comparator.comparing(MesProcessTooling::getRowNumber)).collect(Collectors.groupingBy(MesProcessTooling::getResourceType, Collectors.groupingBy(MesProcessTooling::getToolingTypeId)));

• 字段条件过滤

  Map<String, List<MesProductionPlan>> mergeNotFullMap = list4WorkStationMesProductionPlan.stream().filter(item -> "NO".equals(item.getMergeFullFlag())).sorted(Comparator.comparing(MesProductionPlan::getPlanStartTime)).collect(Collectors.groupingBy(MesProductionPlan::getMergeType, LinkedHashMap::new, Collectors.toList()));