HibernateSessionFactoryUtil

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手动创建session过程：

Configuration cfg = new Configuration().configure("/hibernate.cfg.xml");SessionFactory sf = cfg.buildSessionFactory();Session session = sf.openSession();Transaction t = session.beginTransaction();session.save(user);t.commit();session.close();

以下是自动创建session的过程：

import org.hibernate.HibernateException;  import org.hibernate.Session;  import org.hibernate.cfg.Configuration;  public class HibernateSessionFactoryUtil {private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();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 HibernateSessionFactoryUtil() {}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 rebuilded in the next call */public static void setConfigFile(String configFile) {HibernateSessionFactoryUtil.configFile = configFile;sessionFactory = null;}/** * return hibernate configuration *  */public static Configuration getConfiguration() {return configuration;}}

改进的操作代码明显简化了：

Session session = HibernateSessionFactoryUtil.getSession();Transaction t = session.beginTransaction();session.save(user);t.commit();HibernateSessionFactoryUtil.closeSession();

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