hibernateUtils

hibernate3.x版本

 package hibernate_01;

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

 public class hibernateUtils {
     private static Configuration cfg = null;
     private static SessionFactory sessionFactory = null;
     private static Session session = null;
     static{
         cfg = new Configuration().configure();
         sessionFactory = cfg.buildSessionFactory();
     }
     public static Session getSession(){
         if(sessionFactory!=null){
             session = sessionFactory.openSession();
         }else{
             sessionFactory = cfg.buildSessionFactory();
         }
         return session = sessionFactory.openSession();
     }
     public static void closeSession(){
         if(session != null && session.isOpen()){
             session.close();
         }
     }
 }

hibernate4.x

 package cn.siggy.util;

 import org.hibernate.Session;
 import org.hibernate.SessionFactory;
 import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
 import org.hibernate.cfg.Configuration;

 public class HibernateUtil {
     private static Configuration cfg=null;
     private static SessionFactory factory=null;
     private static Session session = null;
     static{
         cfg = new Configuration().configure();
         factory = cfg.buildSessionFactory(new StandardServiceRegistryBuilder()
         .applySettings(cfg.getProperties()).build());
     }
     public static Session getSession(){
         if(factory!=null)
             return factory.openSession();
         factory=cfg.buildSessionFactory(new StandardServiceRegistryBuilder()
         .applySettings(cfg.getProperties()).build());
         return session = factory.openSession();
     }
     public static void closeSession(){
         if(session!=null&&session.isOpen())
             session.close();
     }
 }