因为spring扫描注册PropertyPlaceholderConfigurer的bean被设置为单例模式,spring只会扫描一个PropertyPlaceholderConfigurer或者<context:property-placeholder>配置,其它多余将被忽略,所以才会出现替代属性值的占位符无法解析。
解决方案:
方案一:
坚持使用多个PropertyPlaceholderConfigurer或者多个<context:property-placeholder>,那么需要添加ignoreUnresolvablePlaceholders属性或者ignore-unresolvable属性,设置其值为true
代码如下:
<bean id="xxx" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="location" value="xxx.properties" /> <property name="ignoreUnresolvablePlaceholders" value="true" /> </bean> <bean id="yyy" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="location" value="yyy.properties" /> <property name="ignoreUnresolvablePlaceholders" value="true" /> </bean>
或者
<context:property-placeholder location="xxx.properties" ignore-unresolvable="true"/> <context:property-placeholder location="yyy.properties" ignore-unresolvable="true"/>
方案二:
将多个PropertyPlaceholderConfigurer或者多个<context:property-placeholder>合并到一个里面,统一加载所有的资源文件
如下代码所示:
<bean id="propertyPlaceholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath:xxx.properties</value> <value>classpath:jyyy.properties</value> </list> </property> </bean>
或者
<context:property-placeholder location="classpath:xxx.properties,classpath:yyy.properties"/>
加载的日志可以发现,创建的propertyPlaceholderConfigurer这个bean是一个单例bean