1回答

• 

  sunbohan00

  2018-09-10 15:07:41

  package com.imooc.page;

  
  

  import org.hibernate.HibernateException;

  import org.hibernate.Session;

  import org.hibernate.cfg.Configuration;

  import org.hibernate.service.ServiceRegistry;

  import org.hibernate.service.ServiceRegistryBuilder;

  
  

  /**

   * 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 final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();

      private static org.hibernate.SessionFactory sessionFactory;

      private static Configuration configuration = new Configuration();

      private static ServiceRegistry serviceRegistry; 

  
  

  static {

      try {

  configuration.configure();

  serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();

  sessionFactory = configuration.buildSessionFactory(serviceRegistry);

  } catch (Exception e) {

  System.err.println("%%%% Error Creating SessionFactory %%%%");

  e.printStackTrace();

  }

      }

      private HibernateSessionFactory() {

      }

  /**

       * Returns the ThreadLocal Session instance.  Lazy initialize

       * the <code>SessionFactory</code> 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();

  serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();

  sessionFactory = configuration.buildSessionFactory(serviceRegistry);

  } 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 hibernate configuration

       *

       */

  public static Configuration getConfiguration() {

  return configuration;

  }

  
  

  }

  
  

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