spring mvc注入配置文件里的属性

<bean
    class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_OVERRIDE" />
    <property name="ignoreResourceNotFound" value="true" />
    <property name="locations">
        <list>
            <value>classpath:config.properties</value>
            <value>classpath:db.properties</value>
        </list>
    </property>
</bean>