绑定当前线程的Hibernate会话配置工具类

import org.hibernate.HibernateException;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;/** *  * <p> * Description：提供一个绑定当前线程的Hibernate会话配置工具类 * <p> * <p> * Copyright：copyright (c) 2013 * <p> * <p> * Create Date：2013-10-26 * <p> * <p> * Company：ShangHai University * <p> *  * @author WANGXU * @version Id: HibernateSessionFactory.java,v1.1,WANGXU Exp */public class HibernateSessionFactory {private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";// 定义hibernate配置文件的路径private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();// 创建一个线程局部类变量，此变量用来存储Session对象private static Configuration configuration = new Configuration();// 初始化配置private static SessionFactory sessionFactory;private static String configFile = CONFIG_FILE_LOCATION;static {try {configuration.configure(configFile);sessionFactory = configuration.buildSessionFactory();// 创建会话工厂} catch (Exception e) {// TODO: handle exceptionSystem.err.println("%%% Error Creating SessionFactory %%%");e.printStackTrace();}}// 将无参构造函数进行封装private HibernateSessionFactory() {}public static Session getSession() throws HibernateException {Session session = threadLocal.get();if (session == null || !session.isOpen()) {if (session == null) {reBuildSessionFactory();}session = (sessionFactory != null) ? sessionFactory.openSession(): null;threadLocal.set(session);}return session;}/*** 此函数用来当创建会话工厂失败后，再次创建会话工厂*/private static void reBuildSessionFactory() {// TODO Auto-generated method stubtry {configuration.configure(configFile);sessionFactory = configuration.buildSessionFactory();} catch (Exception e) {// TODO: handle exceptionSystem.err.println("%%% Error Creating SessionFactory %%%");e.printStackTrace();}}/*** 此函数用来关闭会话* * @throws HibernateException*/public static void closeSession() throws HibernateException {Session session = threadLocal.get();threadLocal.set(null);if (session != null) {session.close();}}public static SessionFactory getSessionFactory() {return sessionFactory;}public void setConfigFile(String configFile) {HibernateSessionFactory.configFile = configFile;sessionFactory = null;}public static Configuration getConfiguration() {return configuration;}}