Hibernate 官方单例获取sessionFactoty

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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;
          }

}