新增用例

spring-cloud/spring-cloud-eureka/README.md

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+# eureka 服务的注册与发现
+
+## 一、项目结构
+
+eureka-server为服务注册中心，负责服务的管理；
+
+eureka-client 为eureka客户端；
+
+![spring-cloud-eureka](D:\spring-samples-for-all\pictures\spring-cloud-eureka.png)
+
+## 二、三步搭建eureka 服务注册中心
+
+#### 2.1 引入eureka服务端依赖
+
+```xml
+<dependency>
+    <groupId>org.springframework.cloud</groupId>
+    <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
+</dependency>
+```
+
+#### 2.2 eureka 服务端配置
+
+```yaml
+server:
+  port: 8010
+eureka:
+  instance:
+    hostname: localhost
+  client:
+    # 设置为false,代表不向注册中心注册自己
+    register-with-eureka: false
+    # 注册中心主要用于维护服务，并不需要检索服务，所以设置为false
+    fetch-registry: false
+    serviceUrl:
+          defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
+```
+
+#### 2.3 启动类上增加注解@EnableEurekaServer激活eureka服务端自动配置
+
+```java
+@SpringBootApplication
+@EnableEurekaServer
+public class EurekaServerApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(EurekaServerApplication.class, args);
+    }
+
+}
+```
+
+## 三、三步搭建eureka 客户端
+
+#### 3.1 引入eureka客户端依赖
+
+```xml
+<dependency>
+    <groupId>org.springframework.cloud</groupId>
+    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
+</dependency>
+```
+
+#### 3.2 eureka 客户端配置
+
+```yaml
+server:
+  port: 8020
+# 指定服务命名
+spring:
+  application:
+    name: eureka-client
+# 指定注册中心地址
+eureka:
+  client:
+    serviceUrl:
+      defaultZone: http://localhost:8010/eureka/
+```
+
+#### 3.3 启动类上增加注解@EnableDiscoveryClient激活eureka客户端自动配置
+
+```java
+@SpringBootApplication
+@EnableDiscoveryClient
+public class EurekaClientApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(EurekaClientApplication.class, args);
+    }
+
+}
+```
+
+## 4.启动项目 
+
+#### 4.1 进入注册中心控制台，查看服务注册情况
+
+![eureka](D:\spring-samples-for-all\pictures\eureka.png)