PropertyPlaceholderConfigurer

 * A property resource configurer that resolves placeholders in bean property values of
 * context definitions. It <i>pulls</i> values from a properties file into bean definitions.

xml 代码

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

${hibernate.connection.driver_class}
通过以下方式可以在spring配置文件中引用properties文件中定义的变量
hibernate.connection.driver_class=××××××