HibernateUtil 初始化类的创建

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

public class HibernateUtil {
private static final ThreadLocal<Session> threadLocal=new ThreadLocal<Session>();
//为保证线程安全，将Seeeion放到ThreadLocal中管理。这样就避免了Session的多线程共享数据的问题

private static SessionFactory sessionFactory=null;
static {
  try {
   Configuration cfg=new Configuration().configure();
   sessionFactory =cfg.buildSessionFactory();
  } catch (HibernateException e) {
   // TODO Auto-generated catch block
   System.out.println("创建会话工厂失败");
   e.printStackTrace();
  }


}
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);//并且为了线程安全，将它放进线程锁中
  }

  return session;
}
public static void rebuildSessionFactory() {
  // TODO Auto-generated method stub
  try {
   Configuration cfg=new Configuration().configure();
   sessionFactory=cfg.buildSessionFactory();
  } catch (HibernateException e) {
   // TODO Auto-generated catch block
   System.out.println("创建会话工厂失败");
   e.printStackTrace();
  }


}
public static SessionFactory getSessionFactory() {
  return sessionFactory;
}
public static void closeSession() throws HibernateException{
  Session session=(Session)threadLocal.get();
  threadLocal.set(null);
  if (session!=null) {
   session.close();
  }

}

}

纯粹是因为懒

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