java 两个List对象取交集 差集 以及交集更新

 

 

List<MainDataMd0006PO> listpo = BeanUtils.transferList(mainDataMd0006Params, MainDataMd0006PO.class);

        //查询 存在的--根据批次编码
        List<MainDataMd0006PO> listup = mainDataMd0006Service.selectBatchIds(listpo);


        // 交集 (list1 & list2) 取list1 表的数据
        List<MainDataMd0006PO> listupdate =
                listpo.stream().filter(item -> listup.stream().map(up -> up.getPOSID()).collect(
                        Collectors.toList()).contains(item.getPOSID())).collect(Collectors.toList());

        listupdate.stream().forEach(update -> listup.stream().filter(up -> Objects.equals(update.getPOSID(), up.getPOSID())).
                findAny().ifPresent(up -> update.setId(up.getId())));


        // 差集 (list1 - list2)
        List<MainDataMd0006PO> listadd =
                listpo.stream().filter(item -> !listup.stream().map(up -> up.getPOSID()).collect(
                        Collectors.toList()).contains(item.getPOSID())).collect(Collectors.toList());

 

更新多个字段示例

List<IrrigationPlanListDTO> irrigationPlanListDTOList=new ArrayList<>();

 //赋值 irrigationTaskUniqueId
                    irrigationPlanListDTOList.stream().forEach(update->irrigationTaskDOList.stream().filter(
                            task->Objects.equals(update.getProcessId(),task.getProcessId())
                    ).findAny().ifPresent(task -> update.setIrrigationTaskUniqueId(task.getIrrigationTaskUniqueId()).setPlanUniqueId(task.getPlanUniqueId()) ));

更新多个字段时对应的实体类上面需要加注解  @Accessors

@Data
@Accessors(chain = true)
public class IrrigationPlanListDTO implements Serializable {

    /**
     * uniqueid
     */
    private String planUniqueId;

    /**
     * 水肥灌溉计划名称
     */
    private String planName;

    /**
     * 计划状态,0=禁用,1=启用
     */
    private Integer status;

    /**
     * 任务uniqueid
     * */
    private String irrigationTaskUniqueId;

    /**
     * 进程id
     * */
    private String processId;

    /**
     * 计划下的总耗时
     * */
    private Long timeCost;

    /**
     * 计划下总次数
     * */
    private Integer totalCount;
}