Dubbo：Nacos作为注册中心

雨点打透心脏的1/2处 2022-01-23 10:25 372阅读 0赞

###### 前言 ######

本文介绍如何通过Nacos作为配置中心，实现Dubbo服务的注册与消费

以HelloService服务为例

public interface HelloService { 
        String sayHello(String name);
    }

服务提供方和消费方都引入以下jar

<dependencys>
    
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
    
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
        </dependency>
    
        
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
        </dependency>
    
        
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-registry-nacos</artifactId>
        </dependency>
    
        <dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
        </dependency>
    </dependencys>

需要搭建一个Nacos服务，这里直接使用[程序员DD][DD]提供的公益性的Nacos服务，  
[详细地址][Link 1]

###### 服务提供方 ######

1.  实现接口

@Service(version = "${dubbo.service.version}")
    public class HelloServiceImpl implements HelloService { 
    
        @Value("${spring.application.name}")
        private String serviceName;
    
        public String sayHello(String name) { 
            return String.format("[%s] : Hello , %s", serviceName, name);
        }
    
    }

1.  配置服务

spring.application.name = nacos-dubbo-provider
    
    dubbo.scan.base-packages= com.github.ly641921791.dubbo.example.nacos.provider.service
    
    dubbo.protocol.name     = dubbo
    dubbo.protocol.port     = -1
    
    # dubbo.registry.address  = nacos://127.0.0.1:8848
    dubbo.registry.address  = nacos://nacos.didispace.com:80
    
    dubbo.service.version   = 1.0.0

1.  引导程序

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

1.  启动应用

启动后在Nacos控制台发现应用注册成功，服务名为`providers:com.github.ly641921791.dubbo.example.common.service.HelloService:1.0.0`

###### 服务消费方 ######

1.  配置服务

spring.application.name = nacos-dubbo-consumer
    
    # dubbo.registry.address  = nacos://127.0.0.1:8848
    dubbo.registry.address  = nacos://nacos.didispace.com:80
    
    dubbo.service.version   = 1.0.0

1.  引导程序 & 服务消费

@SpringBootApplication
    public class NacosConsumerApplication { 
    
        @Reference(version = "${dubbo.service.version}")
        private HelloService helloService;
    
        public static void main(String[] args) { 
            SpringApplication.run(NacosConsumerApplication.class, args).close();
        }
    
        @Bean
        public ApplicationRunner runner() { 
            return new ApplicationRunner() { 
                public void run(ApplicationArguments args) throws Exception { 
                    System.out.println(helloService.sayHello("consumer"));
                }
            };
        }
    }

1.  启动程序

控制台打印出`[nacos-provider] : Hello , consumer`，说明消费成功

###### 源码及参考 ######

源码地址（可运行） ：[https://github.com/ly641921791/knowledge-examples/tree/master/dubbo-example][https_github.com_ly641921791_knowledge-examples_tree_master_dubbo-example]

*  服务提供模块 ：nacos-dubbo-provider
 *  服务消费模块 ：nacos-dubbo-consumer

参考文档（Nacos官网） ：[http://dubbo.apache.org/zh-cn/docs/user/references/registry/nacos.html][http_dubbo.apache.org_zh-cn_docs_user_references_registry_nacos.html]

参考案例（Nacos示例） ：[https://github.com/apache/dubbo-spring-boot-project/tree/master/dubbo-spring-boot-samples/dubbo-registry-nacos-samples][https_github.com_apache_dubbo-spring-boot-project_tree_master_dubbo-spring-boot-samples_dubbo-registry-nacos-samples]

[DD]: http://blog.didispace.com/
[Link 1]: http://blog.didispace.com/open-nacos-server-1-0-0/
[https_github.com_ly641921791_knowledge-examples_tree_master_dubbo-example]: https://github.com/ly641921791/knowledge-examples/tree/master/dubbo-example
[http_dubbo.apache.org_zh-cn_docs_user_references_registry_nacos.html]: http://dubbo.apache.org/zh-cn/docs/user/references/registry/nacos.html
[https_github.com_apache_dubbo-spring-boot-project_tree_master_dubbo-spring-boot-samples_dubbo-registry-nacos-samples]: https://github.com/apache/dubbo-spring-boot-project/tree/master/dubbo-spring-boot-samples/dubbo-registry-nacos-samples