spring data jpa分页

controller层

 1 @RequestMapping(value="/search")

 2     @ResponseBody

 3     public String search(HttpServletRequest request,int pageIndex,int size) {

 4         HttpSession session = request.getSession();

 5         User user = (User)session.getAttribute("user");

 6         Page<Message> page = onlineMessageService.pageFind(user,pageIndex, size);

 7         Map<String, Object> tableMap = new HashMap<String, Object>();

 8         tableMap.put("total", page.getTotalElements());

 9         tableMap.put("messages", page.getContent());

10         return ResponseJSON.instance().setData(tableMap).toJSON();

11 

12     }

service层

 1 @Transactional

 2     public Page<Message> pageFind(final User user,int pageIndex,int size) {

 3         Specification<Message> messgeSpeci = new Specification<Message>() {

 4             @Override

 5             public Predicate toPredicate(Root<Message> root, CriteriaQuery<?> query, CriteriaBuilder cb) {

 6                 List<Predicate> predicates = new ArrayList<Predicate>();

 7                 predicates.add(cb.equal(root.get("user").<String>get("status"),"1"));

 8                 predicates.add(cb.equal(root.<String> get("isOnlineRead"),"0"));

 9                 query.where(predicates.toArray(new Predicate[] {}));

10                 return null;

11             }

12         };

13         return MessageRepository.findAll(messgeSpeci, new PageRequest(pageIndex,size));

14     }

 持久层接口继承

1 public interface MessageRepository extends JpaRepository<Message, Long> ,JpaSpecificationExecutor<Message>{.....}