一.設計思想
1）利用消息總線觸發一個客戶端/bus/refresh,而刷新所有客戶端的配置

2）利用消息總線觸發一個服務端ConfigServer的/bus/refresh斷電，而刷新所有客戶端的配置

圖二的架構顯然更加適合，圖—不適合的原因如下
1.打破了微服務的職責單一性，因為微服務本身是業務模塊，它不應該承擔配置刷新的職責
2.破壞了微服務各節點的對等性
3.有一定的局限性，例如微服務在遷移時，它的網絡地址常發生變化，如果想做到自動刷新，那就會增加更多的修改

二.創建3366模塊
1.新建：cloud-config-client-3366

2.pom

 <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--監控-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--eureka client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!--熱部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

3.yml

4.主啟動類

@SpringBootApplication
@EnableEurekaClient
public class ConfigClientMain3366 {

    public static void main(String[] args) {
        SpringApplication.run(ConfigClientMain3366.class,args);

    }
}

5.controller

@RestController
@RefreshScope
public class ConfigClientController {

    // 因為config倉庫以rest形式暴露，所以所有客戶端都可以通過config服務端訪問到github上對應的文件信息
    @Value("${config.info}")
    private String configInfo;

    @Value("${server.port}")
    private String serverPort;

    @GetMapping("/configInfo")
    public String getConfigInfo() {
        return "serverPort: " + serverPort + "\t\n\n configInfo" + configInfo;
    }
}