HibernateUtil工具類的使用

為了簡化代碼的重復性，使用HibernateUtil工具類對Hibernate有關的代碼進行整合

主要實現有，getSessionFactory()，getSession()，closeSession()

public class HibernateUtil {

	  private static final SessionFactory sessionFactory=buildSessionFactory();
	  private static  Session session;
	  

	private static SessionFactory buildSessionFactory(){
		Configuration configuration=new Configuration().configure(); //實例化配置
		ServiceRegistry serviceRegistry=new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();//生成服務登記
	    return configuration.buildSessionFactory(serviceRegistry);
	}
	//獲取sessionFactory
	public static SessionFactory getSessionFactory(){
		return sessionFactory;
	}
	//獲取session
	public static Session getSession(){
		return sessionFactory.openSession();
	}
	//關閉session
	public static void closeSession(){
		if(session!=null){
			session.close();
		}
	}
}