spring配置文件，需要关注如下两个类。
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| org.springframework.beans.factory.config.PropertiesFactoryBean
org.springframework.context.support.PropertySourcesPlaceholderConfigurer
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PropertiesFactoryBean类图
PropertySourcesPlaceholderConfigurer
如下是配置方式
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<context:property-placeholder location="classpath*:config/*.properties"/>
<util:properties id="appConfig1" location="classpath*:config/*.properties"/>
<bean id="spc" class="org.springframework.context.support.PropertySourcesPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:config/data.properties</value>
<value>classpath:config/data1.properties</value>
</list>
</property>
<property name="ignoreResourceNotFound" value="false"/>
</bean>
<bean id="appConfig" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="locations">
<list>
<value>classpath:config/data.properties</value>
<value>classpath:config/data1.properties</value>
</list>
</property>
</bean>
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使用方式上，用@Value注解
PropertiesFactoryBean用#{}的方式
PropertySourcesPlaceholderConfigurer用${}的方式
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| @Value(value = "${driveClass}")
private String driveClass;
@Value("${url}")
private String url;
@Value("#{appConfig['userName']}")
private String userName;
@Value("#{appConfig['config1']}")
private String password;
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