spring中的hibnate如何配置 ？最好能说下原理

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">        <property name="dataSource" ref="datasource"></property>        <property name="configurationClass">            <value>org.hibernate.cfg.AnnotationConfiguration</value>        </property>        <property name="hibernateProperties">            <props>                <prop key="hibernate.dialect">${hibernate.dialect}</prop>                <prop key="hibernate.show_sql">${hibernate.show_sql}</prop>                <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>            </props>        </property>        <property name="configLocations">            <list>                <value>classpath*:hibernate.cfg.xml</value>            </list>        </property>    </bean>
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http://blog.csdn.net/luohuijun619/article/details/5012957