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！！！
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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：/{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。
