session和线程绑定

public class HibernateUtils {
    private static SessionFactory factory;
    private static ThreadLocal<Session> threadLocal=new ThreadLocal<Session>();

    static{
        try {
            Configuration configuration=new Configuration();
            configuration.configure("hibernate.cmd.xml");
            factory = configuration.buildSessionFactory();
        }catch (ExceptionInInitializerError e){
            throw new ExceptionInInitializerError("初始化SessionFactory失败，请检查配置文件");
        }
    }

    public static Session getSession(){
        Session s=threadLocal.get();
        if (s==null) {
            threadLocal.set(factory.openSession());
        }
        s=threadLocal.get();
        return s;
    }
}public class HibernateUtils {
    private static SessionFactory factory;
    private static ThreadLocal<Session> threadLocal=new ThreadLocal<Session>();

    static{
        try {
            Configuration configuration=new Configuration();
            configuration.configure("hibernate.cmd.xml");
            factory = configuration.buildSessionFactory();
        }catch (ExceptionInInitializerError e){
            throw new ExceptionInInitializerError("初始化SessionFactory失败，请检查配置文件");
        }
    }

    public static Session getSession(){
        Session s=threadLocal.get();
        if (s==null) {
            threadLocal.set(factory.openSession());
        }
        s=threadLocal.get();
        return s;
    }
}

  <!--绑定线程和session,实现一个session只有一个线程。-->
  <property name="hibernate.current_session_context_class">thread</property>

/**
     *从线程上获取session
     * 配置了线程和session绑定，才能用
     * @return
     */
    public static Session getCurrnetSession(){
        return factory.getCurrentSession();
    }