Hibernate5.1.0.Final的配置上的一点小问题

　　原本是不想用这么新的Hibernate框架的，毕竟新的东西资料比较少。由于使用的maven私库似乎jar包不全，hibernate4的jar包不是本身缺少就是相关缺少依赖包，所以就干脆用这个了。

　　一开始参照网上Hibernate4的样子写了SessionFactory。

package com.ynwi.ssh.daoImpl;  
      
    import org.hibernate.HibernateException;  
    import org.hibernate.Session;  
    import org.hibernate.SessionFactory;  
    import org.hibernate.cfg.Configuration;  
    import org.hibernate.service.ServiceRegistry;  
    import org.hibernate.service.ServiceRegistryBuilder;  
      
    public class HibernateSessionFactory {  
      
        private static final String CFG_FILE_LOCATION = "/Hibernate.cfg.xml";  
      
        private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();  
      
        private static final Configuration cfg = new Configuration()  
                .configure(CFG_FILE_LOCATION);  
      
        private static ServiceRegistryBuilder builder = new ServiceRegistryBuilder()  
                .applySettings(cfg.getProperties());  
      
        private static ServiceRegistry registry;  
      
        private static SessionFactory sessionFactory;  
      
        public static Session currentSession() throws HibernateException {  
            Session session = threadLocal.get();  
      
            if (session == null || session.isOpen() == false) {  
      
                if (sessionFactory == null) {  
                    try {  
                        registry = builder.buildServiceRegistry();  
                        sessionFactory = cfg.buildSessionFactory(registry);  
                    } catch (Exception e) {  
                        e.printStackTrace();  
                    }  
               }  
      
                session = sessionFactory.openSession();  
                threadLocal.set(session);  
      
           }  
     
            return session;  
       }  
     
       public static void closeSession() throws HibernateException {  
            Session session = threadLocal.get();  
            threadLocal.set(null);  
            if (session != null) {  
                session.close();  
           }  
        }  
      
    }

　　然后测试，返回错误信息not mapped。

　　

　　根据网上找来的一些建议，仔细检查了hibernate.cfg.xml配置，确认在src下面，并且添加了User.hbm.xml的mapping。HQL里写的也是类名不是表名。然后觉得应该是新版本的不同的地方。所以去查了官方文档。

嗯，sessionFactory这里是new了一个MetaDataSources，并且ServiceRegistry变成了StandardServiceRegistry,于是我就结合官方的例子做了修改

private static final String CFG_FILE_ADDRESS = "/hibernate.cfg.xml";
    
    private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
    
    private static final Configuration cfg = new Configuration().configure(CFG_FILE_ADDRESS);
    
    private static StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties());
    
    private static ServiceRegistry registry;
    
    private static SessionFactory sessionFactory;
    
    public static Session currentSession() throws HibernateException {
        Session session = threadLocal.get();
        
        if (session == null || session.isOpen() == false) {
            
            if (sessionFactory == null) {
                try {
                    registry = builder.build();
                    sessionFactory = new MetadataSources(registry).buildMetadata().buildSessionFactory();
                } catch (HibernateException e) {
                    StandardServiceRegistryBuilder.destroy(registry);
                    e.printStackTrace();
                }
                
            }
            session = sessionFactory.openSession();
            threadLocal.set(session);
        }
        return session;
    }

然后试了下，结果还是报了上面的错误。开始还以为是5.1不支持xml的mapping配置了，去改用注解配置，结果还是找不到。经过一番尝试，终于发现了问题，似乎StandardServiceRegistryBuilder 的applySettings方法已经没用了，要使用configure方法。

//    private static final String CFG_FILE_ADDRESS = "/hibernate.cfg.xml";
    
    private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
    
//    private static final Configuration cfg = new Configuration().configure(CFG_FILE_ADDRESS);
    
//    private static StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder().configure();
    
    private static StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder().configure();

由于hibernate.cfg.xml在src下，所以configure不用传配置路径。当然也可以这么写：

private static final String CFG_FILE_ADDRESS = "/hibernate.cfg.xml";
private static StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder().configure(CFG_FILE_ADDRESS);

 

参考路径：

Eclipse搭建SSH（Struts2+Spring3+Hibernate3）框架项目教程：http://blog.csdn.net/yeohcooller/article/details/9316923

Hibernate5.1 Doc： http://docs.jboss.org/hibernate/orm/5.1/quickstart/html_single/