Spring 使用Properties配置文件

1. jdbc.properties

database.url=jdbc:mysql://localhost/smaple
database.driver=org.gjt.mm.mysql.Driver
database.user=root
database.password=star1xing

2.conf.xml


SPRING//DTD BEAN//EN" "spring-beans.dtd">


            class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
       
            com/starxing/test/jdbc.properties
       
   
            class="org.springframework.jdbc.datasource.DriverManagerDataSource">
       
            ${database.url}
       
       
            ${database.driver}
       
       
            ${database.user}
       
       
            ${database.password}
       

   

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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．

"propertyConfigurer"
          class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        "location" value="classpath:config/jdoserver.properties"/>

        properties"/>
    

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：

"locations">

                classpath:config/maxid.properties
                classpath:config/jdoserver.properties

            
                classpath:config/maxid.properties
                classpath:config/jdoserver.properties
            

 

使用外部属性后如下：

Java代码

"dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        "driverClassName" value="${jdbc.agent.driver}"/>
        "url" value="${jdbc.agent.main.url}"/>

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

<bean id="configBean"
   class="org.springframework.beans.factory.config.PropertyOverrideConfigurer">
         <property name="location">
             <value>hello.propertiesvalue>
         property>
     bean>

     <bean id="helloBean" class="com.HelloBean">
         <property name="word">
             <value>Hello!value>
         property>
     bean>

 
          
             hello.properties 
          
      

      
          
             Hello! 
          
     

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.