Hibernate 官方单例获取sessionFactoty

package com.newer; import org.hibernate.HibernateException; import org.hibernate.SessionFactory; import org.hibernate.cfg.AnnotationConfiguration; /**  * Hibernate官方提供的工具类  */ public class HibernateUtil {           private static final SessionFactory sessionFactory; //单态模式           static{                    try {                             sessionFactory=new AnnotationConfiguration().                                          configure("hibernate.cfg.xml").buildSessionFactory(); //加载配置                    } catch (HibernateException e) {                             System.err.println("加载配置错误"+e);                             throw new ExceptionInInitializerError(e); //抛出异常                    }           }           public static SessionFactory getSessionfactory() {                    return sessionFactory;           }   }