Hibernate 工具类

package com.newer; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.cfg.AnnotationConfiguration; import org.hibernate.cfg.Configuration; /**  * HibernateSessionFactory 工具类 <br/>  * 此类用于获取 sessionFactory、session等  */ public class HibernateSessionFactory {     private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";  //位置classPath里面:      private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();     private static org.hibernate.SessionFactory sessionFactory;     private static String configFile = CONFIG_FILE_LOCATION;         //private  static Configuration configuration = new Configuration(); //XML配置时使用     private  static Configuration configuration = new AnnotationConfiguration(); //@注解配置时使用     static {               try {                      configuration.configure(configFile);                      sessionFactory = configuration.buildSessionFactory();               } catch (Exception e) {                      System.err.println("%%%% Error Creating SessionFactory %%%%");                      e.printStackTrace();              }     }      /**      * 构造方法      */     private HibernateSessionFactory() {     }       /**       * 获取Session的方法 <br/>       * session使用完后应 close()释放掉<br/>       * 因为每个session 都会带上一个数据库连接       * @return       */     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;     }     public static void rebuildSessionFactory() {             try {                     configuration.configure(configFile);                     sessionFactory = configuration.buildSessionFactory();             } catch (Exception e) {                     System.err.println("%%%% Error Creating SessionFactory %%%%");                     e.printStackTrace();             }     }     public static void closeSession() throws HibernateException {             Session session = (Session) threadLocal.get();             threadLocal.set(null);             if (session != null) {                     session.close();             }     }     /**      * 获取sessionFactory的方法      * @return      */     public static org.hibernate.SessionFactory getSessionFactory() {                return sessionFactory;     }     /**      * 清空 sessionFactory 的方法      * @return      */     public static void setConfigFile(String configFile) {               HibernateSessionFactory.configFile = configFile;               sessionFactory = null;     }     /**      * 获取 configuration 的方法      * @return      */    public static Configuration getConfiguration() {              return configuration;    } }