本文链接：https://blog.csdn.net/true1cc/article/details/81170079

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：
/{application}/{profile}[/{label}]：
~： /{application}-{profile}.yml

~： /{label}/{application}-{profile}.yml

~： /{application}-{profile}.properties

~： /{label}/{application}-{profile}.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。

Spring Cloud Config-Client 无法获取 Config-Server 在 github 上的配置文件的属性值，竟然是因为

Spring Cloud Config-Client 无法获取 Config-Server 在 github 上的配置文件的属性值，竟然是因为！！！

！！！原因！！！