打包HibernateUtil对象，方便的工具类（转）

封装HibernateUtil对象，方便的工具类（转）

package?org.cric.util; ??import?org.hibernate.Session; ??import?org.hibernate.SessionFactory; ??import?org.hibernate.cfg.Configuration; ????public?class?HibernateUtil?{ ??????private?static?SessionFactory?factory; ??????static{//只创建一次，单实例 ??????????try{ ??????????????//实例化Configuration对象,configure()方法,默认加载hibernate.hbm.xml文件 ??????????????Configuration?cfg=new?Configuration().configure(); ??????????????//虚拟数据库 ??????????????factory=cfg.buildSessionFactory(); ??????????}catch(Exception?e){ ??????????????e.printStackTrace(); ??????????} ??????} ?????? ??????public?static?SessionFactory?getSessionFactory(){//获取SessionFactory对象 ??????????return?factory; ??????} ?????? ??????public?static?Session?getSession(){//获取Session对象 ??????????return?factory.openSession(); ??????} ?????? ??????public?static?void?closeSession(Session?session){//关闭Session,因为Session不是线程安全的！ ??????????//线程安全是指多个线程并发时,线程之间不会相互影响 ??????????//比如,在多个线程同时操作对象的某个实例变量时,就回出现不正确的现象 ??????????if(session!=null){ ??????????????if(session.isOpen()){ ??????????????????session.close(); ??????????????} ??????????} ??????} ??}??