hibernate的session的util的获取与关闭

package com.hotel.HButil;

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

public class HButil {
    private static SessionFactory factory; 
        
       static { 
           try { 
               //读取hibernate.cfg.xml文件 
               Configuration cfg = new Configuration().configure(); 
                
               //建立SessionFactory 
               factory = cfg.buildSessionFactory(); 
           }catch(Exception e) { 
               e.printStackTrace(); 
           } 
       } 
       /*
         *打开Session
       */ 
        
       public static Session getSession() { 
           return factory.openSession(); 
       }  
       /*
         *关闭Session
       */ 
        
       public static void closeSession(Session session) { 
           if (session != null) { 
               if (session.isOpen()) {
                session.clear();
                   session.close(); 
               } 
           } 
       } 
        
       public static SessionFactory getSessionFactory() { 
           return factory; 
       }

}