Dobbo --- HelloWorld项目搭建

1. demo – spring方式集成

dubbo官方文档

提供一个可被调用的接口
提供方：实现接口的方法逻辑，启动应用程序，接收消费方的调用
消费方：确认要调用的接口，找到注册中心，调用提供方，获取接口的返回结果

示例文档参考：https://github.com/apache/dubbo

1.1 实现步骤

图1-2 提前展示项目文件

1. 启动zookeeper

图1-1启动zoopeeper

3. 引入相关依赖

    
    <properties>
        <dubbo.version>3.2.5</dubbo.version>
    </properties>
	<dependencies>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo</artifactId>
            <version>${dubbo.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-dependencies-zookeeper</artifactId>
            <version>${dubbo.version}</version>
            <type>pom</type>
        </dependency>
    </dependencies>

4. 声明接口及其实现类

声明GreetingsService 接口

public interface GreetingsService {
    String sayHi(String name);
}

GreetingsService 具体实现类

import com.jyl.api.GreetingsService;

public class GreetingsServiceImpl implements GreetingsService {

    public String sayHi(String name) {
        return "hi, " + name;
    }
}

4. 创建提供方和消费方的应用程序

服务端Application

import com.jyl.api.GreetingsService;
import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.ServiceConfig;

import java.util.concurrent.CountDownLatch;

public class Application {
    // 先获取zookeeper部署的ip地址
    private static String zookeeperHost = System.getProperty("zookeeper.address", "127.0.0.1");

    public static void main(String[] args) throws Exception {
        // 创建服务配置 服务对应的接口类GreetingsService 设置泛型
        ServiceConfig<GreetingsService> service = new ServiceConfig<GreetingsService>();
        // 设置应用程序的名称
        service.setApplication(new ApplicationConfig("first-dubbo-provider"));
        // 设置注册中心 指定zookeeper的连接地址
        service.setRegistry(new RegistryConfig("zookeeper://" + zookeeperHost + ":2181"));
        // 设置提供的接口
        service.setInterface(GreetingsService.class);
        // 设置提供具体的实现类
        service.setRef(new GreetingsServiceImpl());
        // 设置完成 执行导出命令
        service.export();

        System.out.println("dubbo service started");
        // 保证线程一直挂起
        new CountDownLatch(1).await();
    }
}

客户端Application

import com.jyl.api.GreetingsService;
import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.ReferenceConfig;
import org.apache.dubbo.config.RegistryConfig;


public class Application {
    // 先获取zookeeper部署的ip地址
    private static String zookeeperHost = System.getProperty("zookeeper.address", "127.0.0.1");


    public static void main(String[] args) {
        // 创建客户配置 服务对应的接口类GreetingsService 设置泛型
        ReferenceConfig<GreetingsService> reference = new ReferenceConfig<GreetingsService>();
        // 设置应用程序的名称
        reference.setApplication(new ApplicationConfig("first-dubbo-consumer"));
        // 设置注册中心 指定zookeeper的连接地址
        reference.setRegistry(new RegistryConfig("zookeeper://" + zookeeperHost + ":2181"));
        // 设置提供的接口
        reference.setInterface(GreetingsService.class);
        // 获取到远程的 接口调用
        GreetingsService service = reference.get();
        String message = service.sayHi("dubbo");
        System.out.println(message);
    }
}

5. 启动服务端Application 和 客户端 Application

图1-3 运行Server/Client

2. demo – springboot方式集成

示例文档参考地址：https://github.com/apache/dubbo-spring-boot-project/tree/master/dubbo-spring-boot-samples

2.1 实现provider

图2-1 提前展示provider项目创建的文件

1. 启动zookeeper
2. 创建dubbo-demo-provider SpringBoot项目
3. 引入依赖（dubbo-springboot、 dubbo-zookeeper、要使用的api的依赖）

   <properties>
        <dubbo.version>2.7.7</dubbo.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>


        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>${dubbo.version}</version>
        </dependency>

        <dependency>
            <groupId>com.jyl</groupId>
            <artifactId>dubbo-demo-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-dependencies-zookeeper</artifactId>
            <version>${dubbo.version}</version>
            <type>pom</type>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

4. 实现provider， 实现接口逻辑，增加配置参数

// 说明这个类是作为dubbo的服务被调用的
@DubboService(version = "1.0.0")
public class DemoServiceImpl implements DemoService {

    @Override
    public String sayHello(String name) {
        return "Hello," + name;
    }
}

5. application.properties配置文件

server.port=8090
# 配置dubbo涉及的相关参数

spring.application.name=dubbo-demo-provider

# 配置dubbo服务的扫描路径
dubbo.scan.base-packages=com.jyl.provider.service

# 协议名称
dubbo.protocol.name=dubbo
dubbo.protocol.port=23456

# dubbo注册中心地址
dubbo.registry.address=zookeeper://127.0.0.1:2181

2.2 实现consumer

图2-2 提前展示consumer项目创建的文件

1. 创建dubbo-demo-consumer SpringBoot项目

2. 引入依赖 和 dubbo-demo-provider项目依赖一致

3. 实现consumer，注意配置类和主程序入口

@SpringBootApplication
public class DubboDemoConsumerApplication {

    //对于调用端
    @DubboReference(version = "1.0.0")
    DemoService demoService;

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

    @Bean
    public ApplicationRunner runner(){

        return args -> System.out.println(demoService.sayHello("dubbo-spring-boot xxx"));
    }
}

4. application.properties

# 设置端口 避免端口号占用
server.port=8899

spring.application.name=dubbo-demo-consumer

# dubbo注册中心地址
dubbo.registry.address=zookeeper://127.0.0.1:2181

2.3 项目测试

先启动demo-provider ，后启动 demo-consumer

图2-4 项目测试结果

寄语【自勉】：想要成功，必须甩掉所有懒惰的借口，起不来、跑不动、戒不掉……成功的路上只需要我可以，一定行！拼搏的滋味最甜美！新的一天，为梦想全力以赴！

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