hibernate4.2.0的HibernateSessionFactory()函数

因为hibernate4放弃了buildSessionFactory()方法，所以getSession()需要重新修改一下，具体代码如下

package com.ssh.pwq.hibernate;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

@SuppressWarnings("deprecation")
public class HibernateSessionFactory {
	private static String CONFIG_FILE_LOCATION 
					= "/hibernate.cfg.xml";							//指定配置文件路径
	private static final ThreadLocal<Session> threadLocal 
					= new ThreadLocal<Session>();					//定义ThreadLocal对象
	private  static Configuration configuration 
					= new Configuration();							//定义Configuration对象
	private static org.hibernate.SessionFactory sessionFactory;		//定义SessionFactory对象
	private static String configFile = CONFIG_FILE_LOCATION;
	static {
		try {
			configuration.configure(configFile);//读取配置文件
			ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().
					applySettings(configuration.getProperties()).buildServiceRegistry();
			sessionFactory = 
				configuration.buildSessionFactory(serviceRegistry);//根据配置文件创建SessionFactory对象
		} catch (Exception e) {
			System.err
					.println("%%%% Error Creating SessionFactory %%%%");
			e.printStackTrace();
		}
	}
	private HibernateSessionFactory() {
	}
	public static Session getSession() throws HibernateException {
		Session session = (Session) threadLocal.get();//从ThreadLocal对象中获得Session对象
		if (session == null || !session.isOpen()) {
			if (sessionFactory == null) {
				rebuildSessionFactory();
			}
			//如果SessionFactory对象不为空，则调用其openSession方法创建Session对象
			session = (sessionFactory != null) ? sessionFactory.openSession(): null;
			threadLocal.set(session);//在ThreadLocal对象中保存该Session对象
		}
		return session;
	}
	public static void rebuildSessionFactory() {
		try {
			configuration.configure(configFile);//读取配置文件
			ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().
					applySettings(configuration.getProperties()).buildServiceRegistry();
			sessionFactory = 
				configuration.buildSessionFactory(serviceRegistry);
		} catch (Exception e) {
			System.err
					.println("%%%% Error Recreating SessionFactory %%%%");
			e.printStackTrace();
		}
	}
	public static void closeSession() throws HibernateException {
		Session session = (Session) threadLocal.get();//从ThreadLocal对象中获得Session对象
		threadLocal.set(null);//将当前线程Session对象从ThreadLocal对象中移除
		if (session != null) {
			session.close();
		}
	}
	public static org.hibernate.SessionFactory getSessionFactory() {//取得SessionFactory对象
		return sessionFactory;
	}
	public static void setConfigFile(String configFile) {//设置新的配置文件
		HibernateSessionFactory.configFile = configFile;
		sessionFactory = null;
	}
	public static Configuration getConfiguration() {//获得Configuration对象
		return configuration;
	}
}