1，项目在spring里配置多个属性文件：

<bean id="propertyPlaceholderConfigurer"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<array>
				<value>classpath:jdbc.properties</value>
				<value>classpath:email-config.properties</value>

			</array>

		</property>
	</bean>

2，@Value注解使用注意事项
见收藏：https://blog.csdn.net/u010002184/article/details/80775804