场景
假如有以下属性文件dev.properties, 需要注入下面的tag
tag=123
通过PropertyPlaceholderConfigurer
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="dev.properties" /></bean>代码@Value("${tag}")
private String tag;通过PreferencesPlaceholderConfigurer<bean id="appConfig" class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">
<property name="location" value="dev.properties" /></bean>代码:@Value("${tag}")
private String tag;通过PropertiesFactoryBean<bean id="config" class="org.springframework.beans.factory.config.PropertiesFactoryBean">
<property name="location" value="dev.properties" /> </bean>123123代码:@Value("#{config['tag']}")
private String tag;通过util:properties效果同PropertiesFactoryBean一样
代码:
@Value("#{config['tag']}")
private String tag;其他方式有时也可以不通过文件,直接写字面量
<bean id="appConfig" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<!--<property name="location" value="classpath:${env}.properties" />--> <property name="properties"> <props> <prop key="tag">123</prop> </props> </property></bean>代码:@Value("${tag}")
private String tag;