JPA实现多条件分页查询

public class 实体类 {

    @Transient
    private int pageNum=1;

    @Transient
    private int pageSize=10000;
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Pageable pageable=PageRequest.of(recruit.getPageNum()-1,recruit.getPageSize(),
                Sort.Direction.DESC,"createTime");

recruitRepository.findAll(specification,pageable);

Specification<PersonnelRecruit> specification = (root, criteriaQuery, criteriaBuilder) -> {
            List<Predicate> predicates = new ArrayList<>();
            if (StringUtils.isNotBlank(recruit.getDept())) {
                predicates.add(criteriaBuilder.equal(root.get("dept"),recruit.getDept()));
            }

            if (StringUtils.isNotBlank(recruit.getName())) {
                predicates.add(criteriaBuilder.like(root.get("name"),"%"+recruit.getName()+"%"));
            }

            if (ObjectUtils.isNotNull(recruit.getCreateTime()) && ObjectUtils.isNotNull(recruit.getCreateEndTime())) {
                predicates.add(criteriaBuilder.between(root.get("createTime"),recruit.getCreateTime(),recruit.getCreateEndTime()));
            }
            Predicate[] p = predicates.toArray(new Predicate[0]);
            return criteriaBuilder.and(p);
        };

 Pageable pageable=PageRequest.of(recruit.getPageNum()-1,recruit.getPageSize(),
                Sort.Direction.DESC,"createTime");
 return recruitRepository.findAll(specification,pageable);

    public Page<QualityTaskDto> findQualityTaskByPage(Integer pageNum, Integer pageSize, String tasktype, String jobname, String satellite) {
        Sort sort = Sort.by(Sort.Direction.ASC, "creatTime");
        Pageable pageable = new PageRequest(pageNum,pageSize,sort);
        Specification<DbDmsQualityTaskInfoDTO> specification = (root, query, cb) ->{
            List<Predicate> predicates = new LinkedList<>();
            if(StringUtils.isNotBlank(tasktype)){
                predicates.add(cb.equal(root.get("tasktype"),tasktype));
            }
            if(StringUtils.isNotBlank(jobname)){
                predicates.add(cb.like(root.get("jobname"),"%"+jobname+"%"));
            }//模糊查询
            if(StringUtils.isNotBlank(satellite)){
                predicates.add(cb.equal(root.get("satellite"),satellite));
            }
            return cb.and(predicates.toArray(new Predicate[predicates.size()]));
        };
        Page<DbDmsQualityTaskInfoDTO> all = qualityTaskInfoDAO.findAll(specification,pageable);
        List<QualityTaskDto> qualityTaskDtos = qualityTaskDto.db2Dto(all.getContent());
        return new PageImpl<>(qualityTaskDtos,pageable,all.getTotalElements());
    }