定义一个工具类获取SessionFactory或Session对象

public final class HibernateUtil{
	private SessionFactory sessionFactory;
	private HibernteUtil(){}
	static{
		Configuration cfg = new Configuration();
		cfg.configure();
		sessionFactory = cfg.buildSessionFactory();
	}
	public static SessionFactory sessionFactory(){
		return sessionFactory;
	}
	public static Session getSession(){
		return sessionFactory.openSession();
	}
}

 如果配置文件不叫hibernate.cfg.xml则在cfg.configure("hibernate.xml")中指定，默认在classpath路径下找。