1、基本的使用方法是
<bean id="propertyConfigurerForWZ" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>classpath:/spring/properties/jdbc.properties</value>
</property>
</bean>
2、当存在多个Properties文件时
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:/spring/properties/jdbc.properties</value>
<value>/WEB-INF/conf/spring/system.properties</value>
</list>
</property>
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:/spring/properties/jdbc.properties</value>
<value>/WEB-INF/conf/spring/system.properties</value>
</list>
</property>
</bean>
3、多个PropertyPlaceholderConfigurer要通过order属性指明加载顺序
<bean id="propertyConfigurerForWZ" 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="propertyConfigurerForWZ" class="org.springframework.beans.factory.
config.PropertyPlaceholderConfigurer">
<property name="order" value="2" />
<property name="ignoreUnresolvablePlaceholders" value="true" />
<property name="location">
<value>classpath:/spring/include/dubbo.properties</value>
</property>
</bean>