hibernate的配置和hibernateUtils的编写

/**
 * mapping.xml的配置
 */
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
    <hibernate-mapping package="org.ronson.model">
    <class name="Ronson">
    <id name="ronsonId">
    <generator class="native"></generator>
    </id>
    <property name="ronsonName" type="string" length="30"/>
    <property name="ronsonPass" type="string"  length="30"/>
    </class>  
    </hibernate-mapping>

/**
 * hibernate-configuration.xml的配置
 */
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
	"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
	"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
	<hibernate-configuration>
	<session-factory>
	<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver
</property>
	<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/数据库名
</property>
	<property name="hibernate.connection.username">数据库账号</property>
	<property name="hibernate.connection.password">数据库密码</property>
	<property name="hibernate.connection.pool_size">1</property>
	<property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
	<property name="hibernate.current_session_context_class">thread</property>
	<property name="hibernate.cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
	<property name="hibernate.show_sql">true</property>
	<property name="hibernate.hbm2ddl.auto">update</property>
	<property name="hibernate.format_sql">true</property>
      //导Class包名以"/"区分;
	<mapping resource="org/ronson/mapping/ronson.hbm.xml"/> 	

</session-factory>
	</hibernate-configuration>

/**
 * HibernateUtils 
 */
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;

public class HibernateUtils {
	
	private static Configuration configuration=null;
	private static StandardServiceRegistryBuilder standardServiceRegistryBuilder=null;
	private static StandardServiceRegistry standardServiceRegistry=null;
	private static SessionFactory sessionFactory=null;
	private static Session session=null;
	private final static ThreadLocal<Session> local=new ThreadLocal<Session>();
	
	
	public static  SessionFactory getSessionFactory(){
           // 加载配置信息
		configuration=new Configuration().configure("hibernate-configuration.xml");
           // 启动hibernate服务
		standardServiceRegistryBuilder=new StandardServiceRegistryBuilder();

           // 配置hibernate的服务
		standardServiceRegistry=standardServiceRegistryBuilder.applySettings(configuration.getProperties()).build();

            // 得到sessionFactory
		sessionFactory=configuration.buildSessionFactory(standardServiceRegistry);
		return sessionFactory;
	}
	
	//通过SessionFactory创建Session
	public static Session getSession(){
			session=local.get();
		if(session==null||!session.isOpen()){
			session=getSessionFactory().getCurrentSession();
			local.set(session);
		}
		return session;
	}
	 //启动Session
	public static void begin(){
		getSession().getTransaction().begin();
	}
	//提交Session
	public static void commit(){
		getSession().getTransaction().commit();
	}

    //关闭Session
	session.close();			
}