建立工程，結構如下：

pom.xml：

<?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">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.htd.dubbo</groupId>
  <artifactId>dubbohtd</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>dubbohtd</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <dubbo.version>2.6.2</dubbo.version>
    <zkclient.version>0.2</zkclient.version>
    <zookeeper.version>3.4.9</zookeeper.version>
    <curator-framework.version>2.12.0</curator-framework.version>
    <slf4j-api.version>1.7.25</slf4j-api.version>
    <logback-classic.version>1.2.3</logback-classic.version>
  </properties>

  <dependencies>
    <!-- Dubbo -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>dubbo</artifactId>
      <version>${dubbo.version}</version>
      <exclusions>
        <exclusion>
          <groupId>org.springframework</groupId>
          <artifactId>spring</artifactId>
        </exclusion>
        <exclusion>
          <groupId>javax.servlet</groupId>
          <artifactId>servlet-api</artifactId>
        </exclusion>
        <exclusion>
          <groupId>log4j</groupId>
          <artifactId>log4j</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

    <!--執行時操作Java位元組碼的方法，dubbo原始碼打包需要,此處可不需要-->
    <dependency>
      <groupId>org.javassist</groupId>
      <artifactId>javassist</artifactId>
      <version>3.20.0-GA</version>
    </dependency>

    <!-- ZK註冊相關 -->
    <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>
      </exclusions>
    </dependency>

  <dependency>
      <groupId>com.101tec</groupId>
      <artifactId>zkclient</artifactId>
      <version>${zkclient.version}</version>
      <exclusions>
        <exclusion>
          <artifactId>slf4j-api</artifactId>
          <groupId>org.slf4j</groupId>
        </exclusion>
        <exclusion>
          <artifactId>log4j</artifactId>
          <groupId>log4j</groupId>
        </exclusion>
        <exclusion>
          <artifactId>slf4j-log4j12</artifactId>
          <groupId>org.slf4j</groupId>
        </exclusion>
      </exclusions>
    </dependency>

    <dependency>
      <groupId>org.apache.curator</groupId>
      <artifactId>curator-framework</artifactId>
      <version>${curator-framework.version}</version>
    </dependency>

    <dependency>
      <groupId>org.apache.curator</groupId>
      <artifactId>curator-framework</artifactId>
      <version>${curator-framework.version}</version>
    </dependency>

    <!-- 日誌-->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j-api.version}</version>
    </dependency>
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>${logback-classic.version}</version>
    </dependency>
  </dependencies>

</project>
 

------------公共介面------------------------

GreetingService：

package com.htd.dubbo.api;

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

----------------提供端----------------------

Application：

package com.htd.dubbo.provider;

import com.alibaba.dubbo.config.ApplicationConfig;
import com.alibaba.dubbo.config.RegistryConfig;
import com.alibaba.dubbo.config.ServiceConfig;
import com.htd.dubbo.api.GreetingService;

import java.io.IOException;

public class Application {

    public static void main(String[] args) throws IOException {
        ServiceConfig<GreetingService> serviceConfig = new ServiceConfig<GreetingService>();
        serviceConfig.setApplication(new ApplicationConfig("first-dubbo-provider"));
        serviceConfig.setRegistry(new RegistryConfig("zookeeper://127.0.0.1:2181"));
        serviceConfig.setInterface(GreetingService.class);
        serviceConfig.setRef(new GreetingServiceImpl());
        serviceConfig.export();
        System.in.read();
    }
}
 

GreetingServiceImpl：

package com.htd.dubbo.provider;


import com.htd.dubbo.api.GreetingService;

public class GreetingServiceImpl implements GreetingService {
    public String sayHello(String name) {

      

        return "Hello " + name;
    }
}

--------------消費端--------------------------
CustomerApplication：
 

package com.htd.dubbo.customer;

import com.alibaba.dubbo.config.ApplicationConfig;
import com.alibaba.dubbo.config.ReferenceConfig;
import com.alibaba.dubbo.config.RegistryConfig;


import com.htd.dubbo.api.GreetingService;

import java.util.UUID;

public class CustomerApplication {

    public static void main(String[] args) {


        ReferenceConfig<GreetingService> referenceConfig = new ReferenceConfig<GreetingService>();
        referenceConfig.setApplication(new ApplicationConfig("first-dubbo-consumer"));
        referenceConfig.setRegistry(new RegistryConfig("zookeeper://127.0.0.1:2181"));
        referenceConfig.setInterface(GreetingService.class);
        GreetingService greetingService = referenceConfig.get();
        System.out.println(greetingService.sayHello("world"));
    }
}