JavaUtils-HibernateSessionFactory.template

package com.sd.packagename.common.util;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

/**
 * @Created with Atom
 * @author @author@
 * @time @now@
 * @description
 * Hibernate Session Factory 工具类
 *
 **/

public class HibernateSessionFactory {
  private static final SessionFactory sessionFactory;
  //使用ThreadLocal管理Session
  private static final ThreadLocal < Session > threadLocal = new ThreadLocal < Session > ();

  static {
    try {
      //根据hibernate.cfg.xml建立SessionFactory
      sessionFactory = new Configuration().configure().buildSessionFactory();
    } catch (Throwable ex) {
      ex.printStackTrace();
      System.err.println("建立SessionFactory错误" + ex);
      throw new ExceptionInInitializerError(ex);
    }
  }

  public static SessionFactory getSessionFactory() {
    return (sessionFactory);
  }

  public static Session getSession() throws HibernateException {
    Session session = (Session) threadLocal.get();

    if ((session == null) || !session.isOpen()) {
      session = (sessionFactory != null) ? sessionFactory.openSession() : null;
      threadLocal.set(session);
    }
    return (session);
  }

  public static void closeSession() throws HibernateException {
    Session session = (Session) threadLocal.get();

    threadLocal.set(null);

    if (session != null && session.isOpen()) {
      session.close();
    }
  }
}