在前面兩篇Spring Cloud Config配置中心的博客中都是需要指定配置服務的地址url：spring.cloud.config.uri，客戶端都是直接調用配置中心的server端來獲取配置文件信息。如果server端要做集羣，客戶端只能通過原始的方式來路由，server端改變IP地址的時候，客戶端也需要修改配置，不符合springcloud服務治理的理念。springcloud提供了這樣的解決方案，我們只需要將server端當做一個服務註冊到eureka中，client端去eureka中去獲取配置中心server端的服務既可。
一、Server端改造
1.添加依賴
在SpringCloudConfigServer項目中，添加spring-cloud-starter-netflix-eureka-client引用。
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.6.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>SpringCloudConfigServer</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <name>SpringCloudConfigServer</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR2</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-config-server</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2.增加了eureka註冊中心的配置
在application.properties中增加eureka註冊中心的配置，http://localhost:8088是後面啓動的eureka server的地址
eureka.client.serviceUrl.defaultZone=http://localhost:8088/eureka/
3.增加註解
在main方法中增加@EnableDiscoveryClient註解
二、客戶端改造
1、添加依賴
也是引入spring-cloud-starter-netflix-eureka-client。
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency>
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.6.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.example</groupId> <artifactId>SpringCloudConfigClient</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <name>SpringCloudConfigClient</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> <spring-cloud.version>Greenwich.SR2</spring-cloud.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> <scope>provided</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <dependencyManagement> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-dependencies</artifactId> <version>${spring-cloud.version}</version> <type>pom</type> <scope>import</scope> </dependency> </dependencies> </dependencyManagement> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2.配置文件
在bootstrap.properties中去掉指定配置服務的地址url，增加了最後的三個配置：
spring.cloud.config.name=neo-config
spring.cloud.config.profile=dev
spring.cloud.config.label=
spring.cloud.config.discovery.enabled=true
spring.cloud.config.discovery.serviceId=spring-cloud-config-server
eureka.client.serviceUrl.defaultZone=http://localhost:8088/eureka/
spring.cloud.config.discovery.enabled ：開啓Config服務發現支持
spring.cloud.config.discovery.serviceId ：指定server端的name,也就是server端spring.application.name的值
eureka.client.serviceUrl.defaultZone ：指向註冊中心的地址
3.啓動類增加註解
在main方法中增加註解@EnableDiscoveryClient。
三、測試
1.分別啓動eureka server、SpringCloudConfigServer、SpringCloudConfigClient。
2.瀏覽器輸入http://localhost:8088/，可以看到注入到eureka server中的服務。
3.輸入http://localhost:8001/neo-config/dev，可以看到配置文件的配置信息。
4.輸入http://localhost:8002/hello，可以讀取到配置文件的屬性信息
參考：http://www.ityouknow.com/springcloud/2017/05/25/springcloud-config-eureka.html