hibernate核心类和接口--openSession 和getCurrentSession的思想

[size=medium]

final public class HibernateUtil { //SqlHelper 
	[size=large]private static SessionFactory sessionFactory=null;
	//使用线程局部模式
	private static ThreadLocal<Session> threadLocal=new ThreadLocal<Session>();
	private HibernateUtil(){};
	static {
		sessionFactory=new Configuration().configure("com/hsp/config/hsp.cfg.xml").buildSessionFactory();
	}
	
	//获取全新的全新的sesession
	public static Session openSession(){
		return sessionFactory.openSession();
	}
	//获取和线程关联的session
	public static Session getCurrentSession(){
		
		Session session=threadLocal.get();
		//判断是否得到
		if(session==null){
			session=sessionFactory.openSession();
			//把session对象设置到 threadLocal,相当于该session已经和线程绑定
			threadLocal.set(session);
		}
		return session;
		
		
	}[/size]
	

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