在Spring项目中使用 Hibernate如何实现一个分页功能

package com.paging;import java.util.List;import javax.annotation.Resource;import org.hibernate.Query;import org.hibernate.SessionFactory;import com.user.User;import sun.nio.cs.US_ASCII;public class Paging { final int num=3; @Resource SessionFactory sessionFactory; public void setSessionFactory(SessionFactory sessionFactory) { this.sessionFactory = sessionFactory; }   public List<User> paging(int index) {  String hql = "from User"; Query query = sessionFactory.getCurrentSession().createQuery(hql); query.setFirstResult((index-1)*num); query.setMaxResults(num);  return query.list();  }    }