Hibernate的一个帮助类感觉写得比较好，有参考价值，果断备份下来……

 1 package cn.zj.qiao.utils;
 2 
 3 import org.hibernate.HibernateException;
 4 import org.hibernate.Session;
 5 import org.hibernate.SessionFactory;
 6 import org.hibernate.cfg.Configuration;
 7 import org.hibernate.service.ServiceRegistry;
 8 import org.hibernate.service.ServiceRegistryBuilder;
 9 
10 public class HibernateUtil {
11     public static final SessionFactory sessionFactory ;
12     public static final ThreadLocal<Session> session = new ThreadLocal<Session>();
13     static{
14         try{
15             //create the sessionFactory from hibernate.cfg.xml
16             Configuration cf = new Configuration().configure();
17             ServiceRegistry sr = new ServiceRegistryBuilder().applySettings(cf.getProperties()).buildServiceRegistry();  
18             sessionFactory = cf.buildSessionFactory(sr);
19         }catch(Throwable e){
20             System.err.println("inital SessionFactory creation failed. " + e);
21             throw new ExceptionInInitializerError(e);
22         }
23     }
24     
25     public static Session currrentSession()throws HibernateException{
26         Session s = (Session)session.get();
27         if(s == null){
28             s = sessionFactory.openSession();
29             session.set(s);
30         }
31         
32         return s;
33     }
34     
35     public static void closeSession()throws HibernateException{
36         Session s = (Session)session.get();
37         if(s != null){
38             s.close();
39             session.set(null);
40         }
41     }
42 }