dubbo学习笔记一（服务注册）

相关的资料

• 官方文档
• 官方博客

项目结构

项目说明

• [lesson1-config-api] 是一个接口工程，编译后是jar包，被其他工程依赖
• [lesson1-config-2-properties-provider] 是服务提供者

代码示例

• [IEchoService]

public interface IEchoService {
    void echo();
}

• [EchoServiceImpl]

@Service
public class EchoServiceImpl implements IEchoService {
    public void echo() {
        System.out.printf("hello");
    }
}

• [ProviderApp]

@RestController
@SpringBootApplication
@EnableDubbo(scanBasePackages = "provider.service.impl")
@PropertySource("classpath:/spring/dubbo-provider.properties")
public class ProviderApp {

    @GetMapping("/hello")
    public String hello() {
        return "hello";
    }

    public static void main(String[] args) throws IOException {
        /**
         * 这种方式启动不能注册服务到zookeeper
         */
        //SpringApplication.run(ProviderApp.class, args);

        /**
         * 官方的demon采用这种方式
         */
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ProviderApp.class);
        context.start();
        System.in.read();

    }

}

或者

@RestController
@SpringBootApplication
public class ProviderApp {

    @GetMapping("/hello")
    public String hello() {
        return "hello";
    }

    public static void main(String[] args) throws IOException {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(ProviderConfiguration.class);
        context.start();
        System.in.read();

    }

    @Configuration
    @EnableDubbo(scanBasePackages = "provider.service.impl")
    @PropertySource("classpath:/spring/dubbo-provider.properties")
    static class ProviderConfiguration {
    }

}

• [dubbo-provider.properties]

# dubbo-provider.properties
dubbo.application.name=annotation-provider
dubbo.protocol.name=dubbo
dubbo.protocol.port=20880
dubbo.registry.address=zookeeper://127.0.0.1:2181

如果配置文件不指定注册中心的话，可以在代码里指定

    @Configuration
    @EnableDubbo(scanBasePackages = "provider.service.impl")
    @PropertySource("classpath:/spring/dubbo-provider.properties")
    static class ProviderConfiguration {
        @Bean
        public RegistryConfig registryConfig() {
            RegistryConfig registryConfig = new RegistryConfig();
            //registryConfig.setAddress("multicast://224.5.6.7:1234");
            registryConfig.setAddress("zookeeper://127.0.0.1:2181");
            return registryConfig;
        }

    }

• [pom.xml]

            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
                <version>1.5.9.RELEASE</version>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-dependencies-zookeeper</artifactId>
                <version>2.7.1</version>
                <type>pom</type>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-config-spring</artifactId>
                <version>2.7.1</version>
            </dependency>

dubbo-config-spring是必须的，如果没有是不会报错，但是服务注册不上

zkCli 查看

[zk: localhost:2181(CONNECTED) 259] ls /dubbo/com.xh.dubbo.learn.lesson1.api.IEchoService/providers
Node does not exist: /dubbo/com.xh.dubbo.learn.lesson1.api.IEchoService/providers
[zk: localhost:2181(CONNECTED) 260] ls /dubbo/com.xh.dubbo.learn.lesson1.api.IEchoService/providers
[dubbo%3A%2F%2F127.0.1.1%3A20880%2Fcom.xh.dubbo.learn.lesson1.api.IEchoService%3Fanyhost%3Dtrue%26application%3Dannotation-provider%26bean.name%3Dproviders%3Adubbo%3Acom.xh.dubbo.learn.lesson1.api.IEchoService%26default.deprecated%3Dfalse%26default.dynamic%3Dfalse%26default.register%3Dtrue%26deprecated%3Dfalse%26dubbo%3D2.0.2%26dynamic%3Dfalse%26generic%3Dfalse%26interface%3Dcom.xh.dubbo.learn.lesson1.api.IEchoService%26methods%3Decho%26pid%3D3935%26register%3Dtrue%26release%3D2.7.1%26side%3Dprovider%26timestamp%3D1557307484341]

在控制台关闭服务后发现zk中的节点没有删除

delete path # 删除叶子节点

rmr path # 递归删除节点和他的子节点