5分钟搞定Dubbo应用接入华为云CSE

Dubbo和CSE底层都使用了Spring的依赖注入和bean管理系统，所以使用Dubbo的服务迁移到华为云微服务引擎CSE的工作量较小，主要改动在依赖和配置方面。

本示例的完整代码已放在GitHub上，其中目录dubbo-demo是原始的Dubbo DEMO，目录dubbo-demo-servicecomb是改造后的可直接运行于华为云CSE的DEMO。

1、管理依赖：/dubbo-demo/pom.xml

在主项目pom里的dependencyManagement中增加如下配置来管理CSE包依赖，子项目就不需要指定CSE版本号。

  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>com.huawei.paas.cse</groupId>
        <artifactId>cse-dependency</artifactId>
        <version>2.3.9</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

注意，maven的settings需添加cse的mirror才能正常下载到cse的相关依赖包：

    <mirror>
      <id>nexus-cse</id>
      <mirrorOf>*</mirrorOf>
      <name>cse nexus</name>
      <url>http://maven.huaweicse.com/nexus/content/groups/public</url>
    </mirror>

2、服务提供方：dubbo-demo-provider

2.1、替换依赖：/dubbo-demo-provider/pom.xml

将对Dubbo的依赖替换为对CSE的依赖pom.xml

Dubbo

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.7</version>
        </dependency>

CSE

        <dependency>
            <groupId>com.huawei.paas.cse</groupId>
            <artifactId>cse-solution-service-engine</artifactId>
        </dependency>

2.2、通过添加标签的方式发布服务接口：DemoServiceImpl

Dubbo

public class DemoServiceImpl implements DemoService {
    ......
}

CSE

@RpcSchema(schemaId = "providerSchema")
public class DemoServiceImpl implements DemoService {

    ......

}

2.3、修改配置：/dubbo-demo-provider/src/main/resources

删除：/dubbo-demo-provider/src/main/resources/META-INF/spring/dubbo-demo-provider.xml

新增：/dubbo-demo-provider/src/main/resources/META-INF/spring/demo.bean.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:util="http://www.springframework.org/schema/util" xmlns:cse="http://www.huawei.com/schema/paas/cse/pojo"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans classpath:org/springframework/beans/factory/xml/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

      <context:component-scan base-package="com.alibaba.dubbo.demo" />
</beans>

新增：/dubbo-demo-provider/src/main/resources/microservice.yaml

APPLICATION_ID: dubbo_servicecomb
service_description:
  name: provider
  version: 0.0.1
cse:
  service:
    registry:
      address: https://cse.cn-north-1.myhuaweicloud.com:443
  rest:
    address: 0.0.0.0:8082
  credentials:
    accessKey: 替换为华为云IAM账号AK（如何获取AK/SK）
    secretKey: 替换为华为云IAM账号SK
    akskCustomCipher: default
    project: cn-north-1

2.4、修改提供方启动入口

Dubbo

public class Provider {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"META-INF/spring/dubbo-demo-provider.xml"});
        context.start();
        System.in.read(); // 按任意键退出
    }
}

CSE

public class Provider {
    public static void main(String[] args) throws Exception {
        Log4jUtils.init();
        BeanUtils.init();
    }
}

3、服务消费方：dubbo-demo-consumer

3.1、替换依赖：/dubbo-demo-consumer/pom.xml

将对Dubbo的依赖替换为对CSE的依赖

Dubbo

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.7</version>
        </dependency>

CSE

		<dependency>
			<groupId>com.huawei.paas.cse</groupId>
			<artifactId>cse-solution-service-engine</artifactId>
		</dependency>

3.2、修改消费方启动入口

Dubbo

public class Consumer {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"META-INF/spring/dubbo-demo-consumer.xml"});
        context.start();

        DemoService demoService = (DemoService) context.getBean("demoService"); 
        String hello = demoService.sayHello("world"); 

        System.out.println(hello); 
    }
}

CSE

import org.springframework.stereotype.Component;

@Component
public class Consumer {
@RpcReference(microserviceName="provider", schemaId="providerSchema")
private static DemoService demoService;
public static void main(String[] args) throws Exception {
Log4jUtils.init();
BeanUtils.init();

String hello = demoService.sayHello("world");
System.out.println(hello);
}
}

3.3、修改配置：/dubbo-demo-comsumer/src/main/resources

删除：/dubbo-demo-consumer/src/main/resources/META-INF/spring/dubbo-demo-consumer.xml

新增：/dubbo-demo-consumer/src/main/resources/META-INF/spring/demo.bean.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:util="http://www.springframework.org/schema/util" xmlns:cse="http://www.huawei.com/schema/paas/cse/pojo"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans classpath:org/springframework/beans/factory/xml/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

      <context:component-scan base-package="com.alibaba.dubbo.demo" />
</beans>

新增：/dubbo-demo-consumer/src/main/resources/microservice.yaml

APPLICATION_ID: dubbo_servicecomb
service_description:
  name: consumer
  version: 0.0.1
cse:
  service:
    registry:
      address: https://cse.cn-north-1.myhuaweicloud.com:443
  rest:
    address: 0.0.0.0:8084
  credentials:
    accessKey: 替换为华为云IAM账号AK（如何获取AK/SK）
    secretKey: 替换为华为云IAM账号SK
    akskCustomCipher: default
    project: cn-north-1