Java Hibernate使用SessionFactory创建Session案例详解

Configuration cfg = new Configuration();
cfg.addResource("com/demo/hibernate/beans/User.hbm.xml");
cfg.setProperty(System.getProperties());
SessionFactory sessionFactory = cfg.buildSessionFactory();

private static final Configuration cfg = new Configuration();
private static org.hibernate.SessionFactory sessionFactory;

private static final ThreadLocal threadLocal = new ThreadLocal();

public static Session currentSession() throws HibernateException {
        Session session = (Session) threadLocal.get();

        if (session == null) {
            if (sessionFactory == null) {
                try {
                    cfg.configure(CONFIG_FILE_LOCATION);
                    sessionFactory = cfg.buildSessionFactory();
                }
                catch (Exception e) {
                    System.err.println("%%%% Error Creating SessionFactory %%%%");
                    e.printStackTrace();
                }
            }
            session = sessionFactory.openSession();
            threadLocal.set(session);
        }

        return session;
    }

public static void closeSession() throws HibernateException {
        Session session = (Session) threadLocal.get();
        threadLocal.set(null);

        if (session != null) {
            session.close();
        }
    }