spring cloud服务发现注解之@EnableDiscoveryClient与@EnableEurekaClient区别

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。