PropertyPlaceholderConfigurer

PropertyPlaceholderConfigurer http://callan.iteye.com/blog/161540

关于PropertyPlaceholderConfigurer与PropertyOverrideConfigurer

PropertyPlaceholderConfigurer,允许在spring的配置文件中加入properties文件,可以将一些动态参数移到properties中．

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<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:config/jdoserver.properties"/>
</bean>

但是好像在属性文件定义中却不支持多个属性文件的定义,比如不能这样用config/*.properties。

经过查看源码,发现可以使用locations属性定义多个配置文件:

Java代码

  <property name="locations">


              


                  <value>classpath:config/maxid.properties</value>


                  <value>classpath:config/jdoserver.properties</value>


              </list>


  </property>

使用外部属性后如下:

  Java代码  <img src="http://callan.iteye.com/images/icon_star.png" alt="收藏代码" />




  <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">


          <property name="driverClassName" value="${jdbc.agent.driver}"/>


          <property name="url" value="${jdbc.agent.main.url}"/>


      </bean>

PropertyOverrideConfigurer: 在spring所有的bean初使化以后,将bean的值强行改变

  Xml代码  <img src="http://callan.iteye.com/images/icon_star.png" alt="收藏代码" />




  <bean id="configBean"


     class="org.springframework.beans.factory.config.PropertyOverrideConfigurer">


           <property name="location">


               <value>hello.properties</value>


           </property>


       </bean>




       <bean id="helloBean" class="com.HelloBean">


           <property name="word">


               <value>Hello!</value>


           </property>


       </bean>

定义HelloBean,注入word的值为hello.

在hello.properties中

helloBean.word=Welcome!

word初使为hello后,当bean全加载完,PropertyOverrideConfigurer将helloBean.word的值改成为welcome.

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