在分布式架构中注册中心起到了管理各种服务功能包括服务的注册、发现、熔断、负载、降级等功能，在分布式架构中起到了不可替代的作用。常见的注册中心有eureka,zookeeper等等,在springcloud中，它封装了Netflix公司开发的Eureka模块来实现服务的注册与发现，简单的来说注册中心里会存放着我们的ip、端口、业务，如果是只是存储我们可以想到很多，数据库，文件，内存，redis都是可以的存的。那么今天小编这里就把redis当成注册中心来实现。
配置与分析在springcloud中我们创建一个业务模块去找注册中心时，一般会@EnableDiscoveryClient、@EnableEurekaClient、@EnableEurekaServer，不过@EnableEurekaClient和@EnableEurekaServer都是Eureka给我提供的。这里我们就要SpringCloud给我们提供的@EnableDiscoveryClient，点击进入@EnableDiscoveryClient源码中。
/* * Copyright 2013-2015 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.cloud.client.discovery; import java.lang.annotation.Documented; import java.lang.annotation.ElementType; import java.lang.annotation.Inherited; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import org.springframework.context.annotation.Import; /** * Annotation to enable a DiscoveryClient implementation. * @author Spencer Gibb */ @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Inherited @Import(EnableDiscoveryClientImportSelector.class) public @interface EnableDiscoveryClient { /** * If true, the ServiceRegistry will automatically register the local server. */ boolean autoRegister() default true; }