spring data jpa分页

controller层

@RequestMapping(value="/search")
    @ResponseBody
    public String search(HttpServletRequest request,int pageIndex,int size) {
        HttpSession session = request.getSession();
        User user = (User)session.getAttribute("user");
        Page<Message> page = onlineMessageService.pageFind(user,pageIndex, size);
        Map<String, Object> tableMap = new HashMap<String, Object>();
        tableMap.put("total", page.getTotalElements());
        tableMap.put("messages", page.getContent());
        return ResponseJSON.instance().setData(tableMap).toJSON();

    }

service层

@Transactional
    public Page<Message> pageFind(final User user,int pageIndex,int size) {
        Specification<Message> messgeSpeci = new Specification<Message>() {
            @Override
            public Predicate toPredicate(Root<Message> root, CriteriaQuery<?> query, CriteriaBuilder cb) {
                List<Predicate> predicates = new ArrayList<Predicate>();
                predicates.add(cb.equal(root.get("user").<String>get("status"),"1"));
                predicates.add(cb.equal(root.<String> get("isOnlineRead"),"0"));
                query.where(predicates.toArray(new Predicate[] {}));
                return null;
            }
        };
        return MessageRepository.findAll(messgeSpeci, new PageRequest(pageIndex,size));
    }

 持久层接口继承

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