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Spring Cloud Config-Server 配置中心 配置文件放在github，配置文件均为bootstrap.yml（bootstrap.yml的优先级级比application.yml高，所以会先去github配置中心获取信息）

运行 Spring Cloud Config-Client 应用程序时，报错信息如下：

java.lang.IllegalArgumentException: Could not resolve placeholder 'from' in value "${from}"





	at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:172) ~[spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:237) ~[spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:211) ~[spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) ~[spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:839) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1086) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:584) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:373) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]





	... 17 common frames omitted

！！！原因！！！

github上的配置文件的名字构成必须是: {application}-{profile}.properties

仓库中的配置文件会被转换成web接口，访问可以参照以下的规则：

//[/]：

~： /-.yml

~： //-.yml

~： /-.properties

~： //-.properties

比如：config-client的配置文件信息如下：

eureka:





  client:





    serviceUrl:





        defaultZone: http://peer1:1122/eureka/





spring:





  application:





    name: config-client





  cloud:





    config:





      uri:  http://localhost:9200/





      label: master





      profile: dev





 





server:





  port: 9300





 





 





 





 

那么在github中的配置文件名必须是：config-client-dev.properties；否则程序启动不起来。