package com.maya.test;

import org.hibernate.*;

import org.hibernate.cfg.*;

public class HibernateUtil {

    private static final SessionFactory factory=buildFactory();        //建一个session工厂，调用方法构建出

    private static final ThreadLocal<Session> threadlock=new ThreadLocal<Session>();    //保证线程安全，构建一个线程锁，保证该线程未结束前不会被占用

    public static SessionFactory buildFactory() {

        Configuration config=new Configuration();

        return config.buildSessionFactory();

    }

    public static Session getSession(){

        Session session=threadlock.get();//获取线程锁中的session

        if(session==null){                    //如果session是空的，打开一个session

            session=factory.openSession();

        }

        threadlock.set(session);    //将session放入线程锁中，保证该线程不会被干扰

        return session;

    }

    public static void closeSession(){        //该方法为关闭session，获取session 如果不为空，那么关闭，并且将线程锁更改为空

        Session session=threadlock.get();

        if(session!=null){

            session.close();

            threadlock.set(null);

        }

    }

}

package com.maya.test;

import org.hibernate.*;

import org.hibernate.cfg.*;

import com.maya.model.Family;

public class FamilyTest {

    public static void main(String[] args){

        Family fa=new Family();

        fa.setName("小明");

        fa.setFirm("召唤师峡谷");

        fa.setInfoCode("p003");

        Session session=HibernateUtil.getSession();//获取session

        try{

            session.beginTransaction();

            session.save(fa);

            session.getTransaction().commit();

        }

        catch(Exception e){

            session.getTransaction().rollback();

        }

        finally{

            HibernateUtil.closeSession();

        }

    }

}