JPA 单表多条件分页

@Service
public class UserServiceImpl implements UserService {
    @Autowired
   UserRepository userRepository;
   
    public Page<User> findAll(Parm parm) {
        Sort sort = Sort.by(Sort.Order.desc("id"));
        Pageable pageable = PageRequest.of(parm.getPageNo()-1, parm.getPageSize(),sort);
        Specification<User> specification = (Specification<User>) (root, query, criteriaBuilder) -> {
            List<Predicate> list = new ArrayList<>();
            if (!StringUtils.isEmpty(findAllParm.getProvince())) {
                Predicate p1 = criteriaBuilder.equal(root.get("province"), parm.getProvince());
                list.add(p1);
            }
            if (!StringUtils.isEmpty(findAllParm.getCity())) {
                Predicate p2 = criteriaBuilder.equal(root.get("city"), parm.getCity());
                list.add(p2);
            }
            if (!StringUtils.isEmpty(findAllParm.getCityarea())) {
                Predicate p3 = criteriaBuilder.equal(root.get("cityarea"), parm.getCityarea());
                list.add(p3);
            }
            Predicate[] pre = new Predicate[list.size()];
            return criteriaBuilder.and(list.toArray(pre));
        };
        return userRepository.findAll(specification, pageable);
    }
}

public interface UserRepository extends JpaRepositoryImplementation<User,Integer> {
}

此分findAll分页查询来自JpaSpecificationExecutor接口，所以继承该接口或者其子接口都可以调用该方法