有关dubbo的基础、架构等介绍请参考之前博客：Dubbo背景及架构简介
XML版（官方推荐）示例请参考：

1. 创建暴露服务模块（dubbo-demo-api）

本模块下没有实际的业务逻辑，主要是定义提供者和消费者公用服务接口

/**
 * 需要暴露出去的服务
 *
 */
public interface HelloService {
    
	/**
	 * say hello
	 * 
	 * @param name
	 * @return
	 */
	String sayHello(String name);

}

2. 创建服务提供者和消费者父模块管理和引入公用依赖

依赖版本管理在父工程（dubbo-demo），采用dubbo-2.7.5
和xml或者注解版本不同的是不需要依赖spring

<?xml version="1.0"?>
<project
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
	xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>com.qqxhb</groupId>
		<artifactId>dubbo-demo</artifactId>
		<version>0.0.1</version>
	</parent>
	<artifactId>dubbo-api-demo</artifactId>
	<packaging>pom</packaging>
	<name>dubbo-api-demo</name>

	<dependencies>
		<!-- 引入Dubbo依赖，原生api不需要依赖spring -->
		<dependency>
			<groupId>org.apache.dubbo</groupId>
			<artifactId>dubbo</artifactId>
			<exclusions>
				<exclusion>
					<groupId>org.springframework</groupId>
					<artifactId>spring-context</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
		<!-- 使用zookeeper作为注册中心 -->
		<dependency>
			<groupId>org.apache.zookeeper</groupId>
			<artifactId>zookeeper</artifactId>
		</dependency>
		<!-- 使用curator作为zookeeper客户端 -->
		<dependency>
			<groupId>org.apache.curator</groupId>
			<artifactId>curator-recipes</artifactId>
		</dependency>
		<!-- 引入需要暴露的服务 -->
		<dependency>
			<groupId>com.qqxhb</groupId>
			<artifactId>dubbo-demo-api</artifactId>
			<version>0.0.1</version>
		</dependency>
	</dependencies>
	<modules>
		<module>dubbo-api-demo-consumer</module>
		<module>dubbo-api-demo-provider</module>
	</modules>
</project>

3. 创建服务提供者

1）.创建dubbo-api-demo-provider模块
2）.编写服务实现类和启动类（两种启动方式）

1）.创建dubbo-api-demo-provider模块

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
		<groupId>com.qqxhb</groupId>
        <artifactId>dubbo-api-demo</artifactId>
        <version>0.0.1</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo-api-demo-provider</artifactId>

</project>

2）.编写服务实现类（HelloServiceImpl）和启动类（BootstrapProviderApplication及ExportProviderApplication）

package com.qqxhb.api.provider.impl;

import org.apache.dubbo.rpc.RpcContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.qqxhb.demo.api.HelloService;

public class HelloServiceImpl implements HelloService {
    
	private static final Logger logger = LoggerFactory.getLogger(HelloServiceImpl.class);

	public String sayHello(String name) {
    
		logger.info("========Hello " + name + ", request from consumer: " + RpcContext.getContext().getRemoteAddress());
		return "Hello " + name + ", response from provider: " + RpcContext.getContext().getLocalAddress();
	}
}

package com.qqxhb.api.provider;

import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.ServiceConfig;
import org.apache.dubbo.config.bootstrap.DubboBootstrap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.qqxhb.api.provider.impl.HelloServiceImpl;
import com.qqxhb.demo.api.HelloService;

/**
 * 
 * 通过DubboBootstrap方式启动服务
 *
 */
public class BootstrapProviderApplication {
    
	private static final Logger logger = LoggerFactory.getLogger(ExportProviderApplication.class);

	public static void main(String[] args) throws Exception {
    
		ServiceConfig<HelloServiceImpl> service = new ServiceConfig<>();
		service.setInterface(HelloService.class);
		service.setRef(new HelloServiceImpl());

		DubboBootstrap bootstrap = DubboBootstrap.getInstance();
		bootstrap.application(new ApplicationConfig("dubbo-api-demo-provider"))
				.registry(new RegistryConfig("zookeeper://127.0.0.1:2181")).service(service).start();
		logger.info("dubbo service started......");
		bootstrap.await();
	}
}

package com.qqxhb.api.provider;

import java.util.concurrent.CountDownLatch;

import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.ServiceConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.qqxhb.api.provider.impl.HelloServiceImpl;
import com.qqxhb.demo.api.HelloService;

/**
 * 
 * 通过服务导出的方式启动服务
 *
 */
public class ExportProviderApplication {
    
	private static final Logger logger = LoggerFactory.getLogger(ExportProviderApplication.class);

	public static void main(String[] args) throws Exception {
    
		ServiceConfig<HelloServiceImpl> service = new ServiceConfig<>();
		service.setInterface(HelloService.class);
		service.setRef(new HelloServiceImpl());

		service.setApplication(new ApplicationConfig("dubbo-api-demo-provider"));
		service.setRegistry(new RegistryConfig("zookeeper://127.0.0.1:2181"));
		service.export();
		logger.info("dubbo service started......");
		new CountDownLatch(1).await();
	}
}

4. 创建服务消费者

1）.创建dubbo-api-demo-consumer模块
2）.消费者启动类（同样有两种方式）

1）.创建dubbo-api-demo-consumer模块

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
		<groupId>com.qqxhb</groupId>
        <artifactId>dubbo-api-demo</artifactId>
        <version>0.0.1</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo-api-demo-consumer</artifactId>
</project>

2）.消费者启动类（BootstrapConsumerApplication 、ExportConsumerApplication）

package com.qqxhb.api.consumer;

import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.ReferenceConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.bootstrap.DubboBootstrap;
import org.apache.dubbo.config.utils.ReferenceConfigCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.qqxhb.demo.api.HelloService;

/**
 * 
 * 通过DubboBootstrap方式启动服务
 *
 */
public class BootstrapConsumerApplication {
    
	private static final Logger logger = LoggerFactory.getLogger(BootstrapConsumerApplication.class);

	public static void main(String[] args) throws Exception {
    
		ReferenceConfig<HelloService> reference = new ReferenceConfig<>();
		reference.setInterface(HelloService.class);

		DubboBootstrap bootstrap = DubboBootstrap.getInstance();
		bootstrap.application(new ApplicationConfig("dubbo-api-demo-consumer"))
				.registry(new RegistryConfig("zookeeper://127.0.0.1:2181")).reference(reference).start();
		HelloService helloService = ReferenceConfigCache.getCache().get(reference);
		String message = helloService.sayHello("Dubbo Bootstrap");
		logger.info("============{}", message);

	}
}

package com.qqxhb.api.consumer;

import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.ReferenceConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.qqxhb.demo.api.HelloService;

/**
 * 
 * 通过服务导出的方式调用服务
 *
 */
public class ExportConsumerApplication {
    
	private static final Logger logger = LoggerFactory.getLogger(BootstrapConsumerApplication.class);

	public static void main(String[] args) throws Exception {
    
		ReferenceConfig<HelloService> reference = new ReferenceConfig<>();
		reference.setApplication(new ApplicationConfig("dubbo-demo-api-consumer"));
		reference.setRegistry(new RegistryConfig("zookeeper://127.0.0.1:2181"));
		reference.setInterface(HelloService.class);
		HelloService service = reference.get();
		String message = service.sayHello("Dubbo Export");
		logger.info("============{}", message);
	}
}

5. 启动测试

1）.依赖zookeeper作为注册中心，因此需要优先启动zookeeper
zookeeper相关知识请参考之前博客：Zookeeper入门及单机及集群环境搭建
2）. 启动任意一个 ProviderApplication 、启动任意一个ConsumerApplication
ProviderApplication 端窗口打印日志======== result: Hello Dubbo Bootstrap, response from provider: 192.168.25.1:20880
ConsumerApplication 端窗口打印日志========Hello Dubbo Bootstrap, request from consumer: /192.168.25.1:7079

源码地址：https://github.com/qqxhb/dubbo-demo