dubbo-springboot入门级demo

1. dubbo-springboot入门级demo

1.1. 前言

1. 最后一个做运维的朋友和我提起，他们公司想做个dubbo灰度发布的功能，而这个功能落到了他头上。在我的印象里，dubbo应该可以通过扩展代码来实现特定用户路由到特定服务器，来实现这方面的灰度功能，但完全由运维去做，可能就需要脚本了吧，dubbo是否支持脚本我还不清楚，趁着这个进一步熟悉dubbo的过程，我来系统的学一下dubbo的基本功能，由于现在基本都用springboot来开发了，所以直接从springboot入门级dubbo应用开始

1.2. 生产者

1.2.1. 服务方法和接口

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

import com.tzxylao.dubbo.service.GreetingService;
import org.apache.dubbo.config.annotation.Service;
import org.springframework.beans.factory.annotation.Value;

@Service(version = "1.0.0")
public class GreetingServiceImpl implements GreetingService {

    @Value("${dubbo.application.name}")
    private String serviceName;
    @Value("${dubbo.protocol.port:0}")
    private int port;

    @Override
    public String sayHello(String name) {
        return String.format("[%s][%s] : Hello, %s", serviceName,port, name);
    }
}

1.2.2. 配置文件application.properties

server.port=8082

dubbo.application.name=first-dubbo-provider
dubbo.scan.base-packages=com.tzxylao.dubbo.service

dubbo.protocol.name=dubbo
dubbo.protocol.port=20884
dubbo.registry.address=zookeeper://127.0.0.1:2181

1.2.3. pom

<properties>
        <java.version>1.8</java.version>
        <spring-boot.version>2.1.1.RELEASE</spring-boot.version>
        <dubbo.version>2.7.1</dubbo.version>
        <curator.version>2.8.0</curator.version>
        <zookeeper.version>3.4.6</zookeeper.version>
    </properties>

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

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>


        <!-- Dubbo Spring Boot Starter -->
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>2.7.1</version>
        </dependency>

        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
        </dependency>


        <!-- zookeeper -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>${zookeeper.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>log4j</groupId>
                    <artifactId>log4j</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>io.netty</groupId>
                    <artifactId>netty</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>${curator.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>${curator.version}</version>
        </dependency>
    </dependencies>
    <repositories>
        <repository>
            <id>apache.snapshots.https</id>
            <name>Apache Development Snapshot Repository</name>
            <url>https://repository.apache.org/content/repositories/snapshots</url>
            <releases>
                <enabled>false</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
    </repositories>

1.2.4. 启动方法

@EnableAutoConfiguration
public class DubboApplication {

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

}

1.3. 消费者

1.3.1. 接口同上

1.3.2. pom同上

1.3.3. 配置文件

server.port=8081

spring.application.name=first-dubbo-consumer
dubbo.registry.address=zookeeper://127.0.0.1:2181

1.3.4. 启动方法

@EnableAutoConfiguration
public class DubboConsumerApplication {

    @Reference(version = "1.0.0")
    private GreetingService greetingService;

    public static void main(String[] args) throws InterruptedException {
        SpringApplication.run(DubboConsumerApplication.class, args);
    }

    @Bean
    public ApplicationRunner runner(){
        int count = 0;
        while (true) {
            System.out.println(greetingService.sayHello("World "));
            try {
                TimeUnit.SECONDS.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            count++;
            if (count == 100) {
                break;
            }
        }
        return s -> {
            System.out.println(greetingService.sayHello("World"));
        };
    }

}

1.4. 运行结果

...
[first-dubbo-provider][20884] : Hello, World
[first-dubbo-provider][20884] : Hello, World
...

1.5. 总结

1. 这里需要注意的几个核心点就是扫描包路劲别搞错
2. @Refernece注解用的是dubbo包里的，@Service也是dubbo包里的

Github地址：https://github.com/tzxylao/learn-demo