Spring中PropertyPlaceholderConfigurer的使用

基本的使用方法是：

<bean id="propertyConfigurerForAnalysis" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

<property name="location">

<value>classpath:/spring/include/dbQuery.properties</value>

</property>

</bean>

其中classpath是引用src目录下的文件写法。

当存在多个Properties文件时，配置就需使用locations了：(2)

<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

<property name="locations">

<list>

<value>classpath:/spring/include/jdbc-parms.properties</value>

<value>classpath:/spring/include/base-config.properties</value>

</list>

</property>

</bean>

接下来我们要使用多个PropertyPlaceholderConfigurer来分散配置，达到整合多工程下的多个分散的Properties 文件，其配置如下：(3)

<bean id="propertyConfigurerForProject1" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

<property name="order" value="1" />

<property name="ignoreUnresolvablePlaceholders" value="true" />

<property name="location">

<value>classpath:/spring/include/dbQuery.properties</value>

</property>

</bean>

<bean id="propertyConfigurerForProject2" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

<property name="order" value="2" />

<property name="ignoreUnresolvablePlaceholders" value="true" />

<property name="locations">

<list>

<value>classpath:/spring/include/jdbc-parms.properties</value>

<value>classpath:/spring/include/base-config.properties</value>

</list>

</property>

</bean>

其中order属性代表其加载顺序，而ignoreUnresolvablePlaceholders为是否忽略不可解析的 Placeholder，如配置了多个PropertyPlaceholderConfigurer，则需设置为true