spring的application.xml中配置从properties读取文件

有两种方法：
<context:property-placeholder location="classpath:jdbc.properties"/>

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

                <value>classpath:jdbc2.properties</value>
            </list>
        </property>
</bean>

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