在使用服务发现的时候有两种注解，
一种为@EnableDiscoveryClient,
一种为@EnableEurekaClient,
用法上基本一致，下文是从stackoverflow上面找到的对这两者的解释：
There are multiple implementations of "Discovery Service" (eureka, consul, zookeeper).
@EnableDiscoveryClient lives in spring-cloud-commons and picks the implementation on the classpath.
@EnableEurekaClient lives in spring-cloud-netflix and only works for eureka. If eureka is on your classpath, they are effectively the same.
意思也就是spring cloud中discovery service有许多种实现（eureka、consul、zookeeper等等）
@EnableDiscoveryClient基于spring-cloud-commons；而 @EnableEurekaClient基于spring-cloud-netflix
对@EnableEurekaClient的源码如下：
/** * Convenience annotation for clients to enable Eureka discovery configuration * (specifically). Use this (optionally) in case you want discovery and know for sure that * it is Eureka you want. All it does is turn on discovery and let the autoconfiguration * find the eureka classes if they are available (i.e. you need Eureka on the classpath as * well). * * @author Dave Syer * @author Spencer Gibb */ @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Inherited @EnableDiscoveryClient public @interface EnableEurekaClient { }
注解@EnableEurekaClient上有@EnableDiscoveryClient注解，可以说基本就是EnableEurekaClient有@EnableDiscoveryClient的功能，另外上面的注释中提到，其实@EnableEurekaClient注解就是一种方便使用eureka的注解而已，可以说使用其他的注册中心后，都可以使用@EnableDiscoveryClient注解，
但是使用@EnableEurekaClient的情景，就是在服务采用eureka作为注册中心的时候，使用场景较为单一。