Spring中PropertyPlaceholderConfigurer的使用(一)

基本的使用方法是：(1)

<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

至此你已经了解到了如何使用PropertyPlaceholderConfigurer，如何使用多个Properties文件，以及如何配置多个PropertyPlaceholderConfigurer来分解工程中分散的Properties文件。至于 PropertyPlaceholderConfigurer还有更多的扩展应用，如属性文件加密解密等方法将在之后的博文中续写