spring 加载properties的方式

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
?? ??? ??? <property name="locations">
?? ??? ??? ??? <list>
?? ??? ??? ??? ??? <value>classpath:config.properties</value>
?? ??? ??? ??? </list>
?? ??? ??? </property>
??? </bean>

?

<context:property-placeholder location="classpath:config.properties"/>