使用Ribbon内的负载均衡策略时候，没有导入Ribbon中IRule接口的问题

也就是 IRule接口，正常去使用需要pom坐标

      <!-- eureka依赖 注册中心和登录 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

	<!-- 需要添加依赖管理 管理springcloud -->
    <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>

    <!-- 如果在maven中找不到 就去springcloud仓库找 -->
    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/libs-milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

这样无法使用 IRule接口,在加入2个 坐标可以使用

        <!-- https://mvnrepository.com/artifact/com.netflix.ribbon/ribbon -->
        <dependency>
            <groupId>com.netflix.ribbon</groupId>
            <artifactId>ribbon</artifactId>
            <version>2.7.18</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-ribbon -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
            <version>2.2.6.RELEASE</version>
        </dependency>