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>{.....}