public interface UserRepository extends JpaRepository<User, Long> {@Query(value = "SELECT * FROM USERS WHERE LASTNAME = ?1",countQuery = "SELECT count(*) FROM USERS WHERE LASTNAME = ?1",nativeQuery = true)Page<User> findByLastname(String lastname, Pageable pageable);
}

public interface PagingAndSortingRepository<T, ID extends Serializable>extends CrudRepository<T, ID> {Iterable<T> findAll(Sort sort);Page<T> findAll(Pageable pageable);
}Accessing the second page of User by a page size of 20 you could simply do something like this:PagingAndSortingRepository<User, Long> repository = // … get access to a bean
Page<User> users = repository.findAll(new PageRequest(1, 20));

User findFirstByOrderByLastnameAsc();User findTopByOrderByAgeDesc();Page<User> queryFirst10ByLastname(String lastname, Pageable pageable);Slice<User> findTop3ByLastname(String lastname, Pageable pageable);List<User> findFirst10ByLastname(String lastname, Sort sort);List<User> findTop10ByLastname(String lastname, Pageable pageable);

//serviceSort sort = new Sort(Sort.Direction.DESC,"createTime"); //创建时间降序排序Pageable pageable = new PageRequest(pageNumber,pageSize,sort);
 this.depositRecordRepository.findAllByUserIdIn(userIds,pageable);//repository
Page<DepositRecord> findAllByUserIdIn(List<Long> userIds,Pageable pageable);

 @Query(value = "select b.roomUid from RoomBoard b where b.userId=:userId and b.lastBoard=true order by  b.createTime desc")Page<String> findRoomUidsByUserIdPageable(@Param("userId") long userId, Pageable pageable);

Pageable pageable = new PageRequest(pageNumber,pageSize);
Page<String> page = this.roomBoardRepository.findRoomUidsByUserIdPageable(userId,pageable);
List<String> roomUids = page.getContent();

public interface UserRepository extends JpaRepository<User, Long> {Page<User> findAll(Specification<User> spec, Pageable pageable);
} 

@Service
public class UserService {@Autowiredprivate UserRepository userRepository;public Page<User> getUsersPage(PageParam pageParam, String nickName) {//规格定义Specification<User> specification = new Specification<User>() {/*** 构造断言* @param root 实体对象引用* @param query 规则查询对象* @param cb 规则构建对象* @return 断言*/@Overridepublic Predicate toPredicate(Root<User> root, CriteriaQuery<?> query, CriteriaBuilder cb) {List<Predicate> predicates = new ArrayList<>(); //所有的断言if(StringUtils.isNotBlank(nickName)){ //添加断言Predicate likeNickName = cb.like(root.get("nickName").as(String.class),nickName "%");predicates.add(likeNickName);}return cb.and(predicates.toArray(new Predicate[0]));}};//分页信息Pageable pageable = new PageRequest(pageParam.getPage()-1,pageParam.getLimit()); //页码：前端从1开始，jpa从0开始，做个转换//查询return this.userRepository.findAll(specification,pageable);}}

@Service
@Transactional
public class IncomeService{/*** 实体管理对象*/@PersistenceContextEntityManager entityManager;public Page<IncomeDaily> findIncomeDailysByPage(PageParam pageParam, String cpId, String appId, Date start, Date end, String sp) {StringBuilder countSelectSql = new StringBuilder();countSelectSql.append("select count(*) from IncomeDaily po where 1=1 ");StringBuilder selectSql = new StringBuilder();selectSql.append("from IncomeDaily po where 1=1 ");Map<String,Object> params = new HashMap<>();StringBuilder whereSql = new StringBuilder();if(StringUtils.isNotBlank(cpId)){whereSql.append(" and cpId=:cpId ");params.put("cpId",cpId);}if(StringUtils.isNotBlank(appId)){whereSql.append(" and appId=:appId ");params.put("appId",appId);}if(StringUtils.isNotBlank(sp)){whereSql.append(" and sp=:sp ");params.put("sp",sp);}if (start == null){start = DateUtil.getStartOfDate(new Date());}whereSql.append(" and po.bizDate >= :startTime");params.put("startTime", start);if (end != null){whereSql.append(" and po.bizDate <= :endTime");params.put("endTime", end);}String countSql = new StringBuilder().append(countSelectSql).append(whereSql).toString();Query countQuery = this.entityManager.createQuery(countSql,Long.class);this.setParameters(countQuery,params);Long count = (Long) countQuery.getSingleResult();String querySql = new StringBuilder().append(selectSql).append(whereSql).toString();Query query = this.entityManager.createQuery(querySql,IncomeDaily.class);this.setParameters(query,params);if(pageParam != null){ //分页
            query.setFirstResult(pageParam.getStart());query.setMaxResults(pageParam.getLength());}List<IncomeDaily> incomeDailyList = query.getResultList();if(pageParam != null) { //分页Pageable pageable = new PageRequest(pageParam.getPage(), pageParam.getLength());Page<IncomeDaily> incomeDailyPage = new PageImpl<IncomeDaily>(incomeDailyList, pageable, count);return incomeDailyPage;}else{ //不分页return new PageImpl<IncomeDaily>(incomeDailyList);}}/*** 给hql参数设置值* @param query 查询* @param params 参数*/private void setParameters(Query query,Map<String,Object> params){for(Map.Entry<String,Object> entry:params.entrySet()){query.setParameter(entry.getKey(),entry.getValue());}}
}