getCurrentSession() 和getSession()的联系

package com.hsp.util;

import org.hibernate.Session;  import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

final public class HibernateUtil { //SqlHelper 

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;

}

}