hibernate4 创建SessionFactory

private static SessionFactory sessionFactory; 
private static ServiceRegistry serviceRegistry; 

private static SessionFactory configureSessionFactory() throws HibernateException { 
    Configuration configuration = new Configuration(); 
    configuration.configure(); 
    serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();         
    sessionFactory = configuration.buildSessionFactory(serviceRegistry); 
    return sessionFactory; 
}