Could not resolve placeholder jdbc.driver in string value ${jdbc.driver}

applicationContext 加载properties类型的配置文件的问题
错误信息：Could not resolve placeholder ‘jdbc.driver’ in string value “${jdbc.driver}”

原因：
在配置文件中，使用2次引入配置文件的扫描，但是两次扫描的key是一样的，并不能进行两次扫描

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

解决方法1
将配置文件写到一个方法里，用 “,” 隔开

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

解决方法2
在每个扫描的配置文件后加上ignore-unresolvable="true"（两处都添加）

<context:property-placeholder location="classpath:config/resouce.properties" ignore-unresolvable="true"/>
<context:property-placeholder location="classpath:config/db.properties" ignore-unresolvable="true"/>

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