Hibernate4：如何获取SessionFactory？

在Hibernate4与Spring3的集成中，已经不再使用Hibernate Template了。那么SessionFactory要如何获取呢？

 

package demo;

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

public final class HibernateUtil {

    private static SessionFactory sessionFactory;
    
    private HibernateUtil() {
        
    }
    
    static {
        try {
            Configuration cfg = new Configuration().configure();
            ServiceRegistry reg = new ServiceRegistryBuilder()
                .applySettings(cfg.getProperties()).buildServiceRegistry();
            sessionFactory = cfg.buildSessionFactory(reg);
        } catch (Throwable e) {
            throw new ExceptionInInitializerError(e);
        }
    }
    
    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
}