这里学习的是hibernate4的构造方式,查看了很多文章了解到这个session的构造在不同的版本是有区别的,在hibernate4以前(至于前到什么地方不太清楚了)可以直接使用Configuration对象的build方法获取到sessionFactory对象。
现在方式不一样了,具体获取代码如下:
package cn.bdx.utils; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.boot.registry.StandardServiceRegistryBuilder; import org.hibernate.cfg.Configuration; import org.hibernate.service.ServiceRegistry; /** * Created by Administrator on 2016/5/23. */ public class HibernateUtils { private static SessionFactory sessionFactory; static { Configuration configuration = new Configuration().configure(); ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build(); sessionFactory = configuration.buildSessionFactory(serviceRegistry); } public static SessionFactory getSessionFactory() { return sessionFactory; } public static Session getSession() throws Exception { if(sessionFactory == null) { throw new Exception("sessionFactory is empty"); } return sessionFactory.openSession(); } }
现在需要通过StandardServiceRegistryBuilder对象获取到一个ServiceRegistry对象,然后通过Configuration对象的buildSessionFactory(ServiceRegistry)获取到SessionFactory,然后再调用SessionFactory对象的openSession()方法或者getCurrenSession()获取到session。