灰度釋出使用：

灰度服務管理服務：

依賴jar包

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>
 
org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId
 
>
        </dependency>

        <dependency>
            <groupId>cn.springcloud.gray</groupId>
            <artifactId>spring-cloud-starter-gray-server</artifactId>
        </dependency>

    </dependencies>

application.yml

spring:
  application:
    name: gray-server
 

server:
  port: 20202
eureka:
  client:
    register-with-eureka: true
    fetch-registry: true
    serviceUrl:
      defaultZone: http://localhost:8080/eureka/

啟動類新增@EnableGrayServer

@SpringBootApplication
@EnableEurekaClient
@EnableGrayServer
public class GrayServerApplication
{
    public static void main( String[] args )
    {
        SpringApplication.run(GrayServerApplication.class,args);
    }
}

業務服務端

依賴jar包

    <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-eureka</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-feign</artifactId>
            </dependency>
            <dependency>
                <groupId>org.apache.commons</groupId>
                <artifactId>commons-lang3</artifactId>
                <version>3.5</version>
            </dependency>

            <dependency>
                <groupId>cn.springcloud.gray</groupId>
                <artifactId>spring-cloud-starter-gray</artifactId>
            </dependency>
        </dependencies>

application.yml

gray:
  client:
    instance:
      grayEnroll: false #是否在啟動後自動註冊成灰度例項
    serverUrl: http://localhost:20202 #灰度服務端的url

呼叫策略組方法：
POST /gray/manager/services/{serviceId}/instance/policyGroup
引數：

serviceId：service0
policyGroupFO:{
  "alias": "1",
  "enable": true,
  "instanceId": "service0:8081",
  "policies": [
    {
      "infos": {"v":"1"},
      "policyId": "1",
      "policyType": "REQUEST_PARAMETER"
    }
  ],
  "policyGroupId": "1"
}

上述策略描述的是： 對服務service0的service0:8081例項添加了策略組。當請求引數中有v=1時，請求路由到該例項。
以上引數中最重要的是:
serviceId,instanceId,infos,poliyType,policyGroupId.
serviceId：服務名
instanceId：服務名:埠號
infos：是一個map
policyType：列舉字串，就四個值：
REQUEST_PARAMETER:請求引數策略
REQUEST_HEADER:請求頭策略
REQUEST_IP ：ip策略
CONTEXT_PARAMS 上下文引數策略