package?com.test;

import?org.hibernate.HibernateException;
import?org.hibernate.Session;
import?org.hibernate.cfg.Configuration;

/**
?*?Configures?and?provides?access?to?Hibernate?sessions?tied?to?the
?*?current?thread?of?execution.??Follows?the?Thread?Local?Session
?*?pattern?see?{@link?http://hibernate.org/42.html?}.
?*/
public?class?HibernateSessionFactory?{

????/**?
?????*?Location?of?hibernate.cfg.xml?file.
?????*?Location?should?be?on?the?classpath?as?Hibernate?uses??
?????*?#resourceAsStream?style?lookup?for?its?configuration?file.?
?????*?The?default?classpath?location?of?the?hibernate?config?file?is?
?????*?in?the?default?package.?Use?#setConfigFile（）?to?update?
?????*?the?location?of?the?configuration?file?for?the?current?session.???
?????*/
????private?static?String?CONFIG_FILE_LOCATION?=?“/hibernate.cfg.xml“;
	private?static?final?ThreadLocal?threadLocal?=?new?ThreadLocal（）;
????private??static?Configuration?configuration?=?new?Configuration（）;
????private?static?org.hibernate.SessionFactory?sessionFactory;
????private?static?String?configFile?=?CONFIG_FILE_LOCATION;

	static?{
????	try?{
			configuration.configure（configFile）;
			sessionFactory?=?configuration.buildSessionFactory（）;
		}?catch?（Exception?e）?{
			System.err
					.println（“%%%%?Error?Creating?SessionFactory?%%%%“）;
			e.printStackTrace（）;
		}
????}
????private?HibernateSessionFactory（）?{
????}
	
	/**
?????*?Returns?the?ThreadLocal?Session?instance.??Lazy?initialize
?????*?the?SessionFactory?if?needed.
?????*
?????*??@return?Session
?????*??@throws?HibernateException
?????*/
????public?static?Session?getSession（）?throws?HibernateException?{
????????Session?session?=?（Session）?threadLocal.get（）;

		if?（session?==?null?||?!session.isOpen（））?{
			if?（sessionFactory?==?null）?{
				rebuildSessionFactory（）;
			}
			session?=?（sessionFactory?!=?null）???sessionFactory.openSession（）
					:?null;
			threadLocal.set（session）;
		}

????????return?session;
????}

	/**
?????*??Rebuild?hibernate?session?factory
?????*
?????*/
	public?static?void?rebuildSessionFactory（）?{
		try?{
			configuration.configure（configFile）;
			sessionFactory?=?configuration.buildSessionFactory（）;
		}?catch?（Exception?e）?{
			System.err
					.println（“%%%%?Error?Creating?SessionFactory?%%%%“）;
			e.printStackTrace（）;
		}
	}

	/**
?????*??Close?the?single?hibernate?session?instance.
?????*
?????*??@throws?HibernateException
?????*/
????public?static?void?closeSession（）?throws?HibernateException?{
????????Session?session?=?（Session）?threadLocal.get（）;
????????threadLocal.set（null）;

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

	/**
?????*??return?session?factory
?????*
?????*/
	public?static?org.hibernate.SessionFactory?getSessionFactory（）?{
		return?sessionFactory;
	}

	/**
?????*??return?session?factory
?????*
?????*	session?factory?will?be?r