hibernateutil.java

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package cn.handson.utils;
import org.apache.commons.logging.*;
import org.hibernate.*;
import org.hibernate.cfg.*;

public class HibernateUtil {
private static Log log=LogFactory.getLog(HibernateUtil.class);
//定义一个日志LOG对象
private static final SessionFactory sessionFactory;
//定义一个SessionFactory对象 
static{
	try{
		//实例化一个SessionFactory对象 
		sessionFactory=new Configuration().configure().buildSessionFactory();
		
	}catch(Throwable ex){
		//把异常错误写入日志对象 
		log.error("Initial SessionFactory creation failed.",ex);
		throw new ExceptionInInitializerError(ex);
	}
}

public static final ThreadLocal session=new ThreadLocal();

public static Session currentSession() throws HibernateException{
	Session s=(Session)session.get();
	//当session为空或者已经关闭的时候就创建一个新的session对象
	if(s==null||!s.isOpen()){
		s=sessionFactory.openSession();
		session.set(s);
	}
	return s;
}

public static void closeSession() throws HibernateException{
	//关闭当前的session
	Session s=(Session)session.get();
	session.set(null);
	if(s!=null){
		s.close();
	}
}
}