1：把session和本地线程绑定在一起。

1）：创建一个sessionFactory。然后由它去创建session

package com.hq.util;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;import org.hibernate.service.ServiceRegistry;import org.hibernate.service.ServiceRegistryBuilder;public class HibernateUtils {        private HibernateUtils(){}        private static HibernateUtils instance=new HibernateUtils();        public static HibernateUtils getInstance(){        return instance;    }        private SessionFactory sessionFactory;    public SessionFactory getSessionFactory() {        if (sessionFactory == null) {            Configuration configuration = new Configuration().configure();            ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()                    .applySettings(configuration.getProperties())                    .buildServiceRegistry();            sessionFactory = configuration.buildSessionFactory(serviceRegistry);        }        return sessionFactory;    }        public Session getSession(){        return getSessionFactory().getCurrentSession();    }}

使用：getCurrentSession()方法。

2）：通过单例的HibernateUtils来得到session

public class DeptDao {    public void save(Department dept){        Session session=HibernateUtils.getInstance().getSession();        System.out.println(session.hashCode());//        session.save(dept);    }    }

3）：在配置文件中配置

             
     
      thread
     

4）：测试

@org.junit.Test    public void testSession(){                //获取 Session                //开启事务                Session session = HibernateUtils.getInstance().getSession();                System.out.println("-->" + session.hashCode());                Transaction transaction = session.beginTransaction();                DeptDao departmentDao = new DeptDao();                                Department dept = new Department();                dept.setName("ATGUIGU");                                departmentDao.save(dept);                departmentDao.save(dept);                departmentDao.save(dept);                                //若 Session 是由 thread 来管理的, 则在提交或回滚事务时, 已经关闭 Session 了.                 transaction.commit();                System.out.println(session.isOpen());     }