关于Hibernate buildsessionfactory()过时处理

Hibernate创建SessionFactory在Hibernate3中和Hibernate4中写法是不一样的，

在Hibernate3中写法：

 

static SessionFactory sessionFactroy;
static {
    try{
        Configuration config = new Configuration().configure();
        sessionFactory = config.buildSessionFactory();
    }catch(Exception e){
        e.printStackTrace();
    }    
}

 

 

 

在Hibernate4中写法：

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

 这里给出一个创建SessionFactory工具类，在工程中加入该类后可直接引用：

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class HibernateUtils{
	private static SessionFactory factory;
        static{
		Configuration cfg = new Configuration().configure();
		ServiceRegistry sr = new ServiceRegistryBuilder().applySettings(
				cfg.getProperties()).buildServiceRegistry();
		factory = cfg.buildSessionFactory(sr);
	}

	public static SessionFactory getSessionFactory(){
		return factory;
	}

	public static Session getSession(){
		return factory.openSession();
	}

	public static void closeSession(Session session){
		if (session != null){
			if (session.isOpen()){
				session.close();
			}
		}
	}
}