專案使用Spring+Dubbo+ZooKeeper，使用Maven管理。

先看專案結構，dubbo-api存放需要呼叫的介面，dubbo-provider實現介面並且暴露介面，dubbo-consumer是介面的呼叫方。

專案依賴

    <dependencies>
        <!--Log Start-->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId
 
>
            <version>${org.slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${org.slf4j.version}</version>
        </dependency
 
>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <!--Log End-->
        <!--Spring Start-->
        <dependency>
            <groupId
 
>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!--Spring End-->
        <!--Dubbo Start-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.5.3</version>
        </dependency>
        <!--Dubbo End-->
        <!--ZooKeeper Start-->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.10</version>
            <type>pom</type>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.10</version>
        </dependency>
        <!--ZooKeeper End-->
    </dependencies>

首先在dubbo-api中定義一個介面DemoService

package com.hqq.service.impl.service;

/**
 * Package: com.hqq.service
 * User: 何芊芊
 * Date: 2017/12/22
 * Time: 10:25
 * Description:
 */
public interface DemoService {
    String echName(String name);
}

在dubbo-provider中實現該介面（依賴api模組）

package com.hqq.service.impl;

import com.hqq.service.impl.service.DemoService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * Package: com.hqq.service.impl
 * User: 何芊芊
 * Date: 2017/12/22
 * Time: 10:28
 * Description:
 */
public class DemoServiceImpl implements DemoService {

    private Logger logger = LoggerFactory.getLogger(DemoServiceImpl.class);

    public String echName(String name) {
        logger.debug("======DemoServiceImpl echName=====" + name);
        return name;
    }
}

編寫dubbo配置檔案

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://code.alibabatech.com/schema/dubbo
       http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    <!--定義了提供方應用資訊，用於計算依賴關係；在 dubbo-admin 或 dubbo-monitor 會顯示這個名字，方便辨識-->
    <dubbo:application name="demotest-provider" owner="programmer" organization="dubbox"/>
    <!--使用 zookeeper 註冊中心暴露服務，注意要先開啟 zookeeper-->
    <dubbo:registry address="zookeeper://localhost:2181"/>
    <!-- 用dubbo協議在20880埠暴露服務 -->
    <dubbo:protocol name="dubbo" port="20880" />
    <!--使用 dubbo 協議實現定義好的 api.PermissionService 介面-->
    <dubbo:service interface="com.hqq.service.impl.service.DemoService" ref="demoService" protocol="dubbo" />
    <!--具體實現該介面的 bean-->
    <bean id="demoService" class="com.hqq.service.impl.DemoServiceImpl"/>
</beans>

啟動provider端

import com.alibaba.dubbo.common.logger.Logger;
import com.alibaba.dubbo.common.logger.LoggerFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

/**
 * Package: PACKAGE_NAME
 * User: 何芊芊
 * Date: 2017/12/22
 * Time: 10:32
 * Description:
 */
public class Provider {

    public static void main(String[] args) throws IOException {
        ClassPathXmlApplicationContext ac = new ClassPathXmlApplicationContext("classpath:spring-dubbo.xml");
        System.out.println(ac.getDisplayName());
        ac.start();
        System.out.println("程式已啟動……");
        System.in.read();
    }
}

執行結果：

org[email protected]1ee2c5
程式已啟動……

在consumer中呼叫該介面

package com.hqq.demo;

import com.hqq.service.impl.service.DemoService;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Package: com.hqq.demo
 * User: 何芊芊
 * Date: 2017/12/22
 * Time: 10:43
 * Description:
 */
public class Consumer {

    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:spring-dubbo-client.xml");
        context.start();
        System.out.println("Consumer Start");
        DemoService demoService = context.getBean(DemoService.class);
        System.out.println("Consumer");
        System.out.println(demoService.echName("heqianqian"));
    }
}

配置檔案如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
       http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">
    <dubbo:application name="demotest-consumer" owner="programmer" organization="dubbox"/>
    <!--向 zookeeper 訂閱 provider 的地址，由 zookeeper 定時推送-->
    <dubbo:registry address="zookeeper://localhost:2181"/>
    <!--使用 dubbo 協議呼叫定義好的 api.PermissionService 介面-->
    <dubbo:reference id="permissionService" interface="com.hqq.service.impl.service.DemoService"/>
</beans>

呼叫結果

Consumer Start
Consumer
heqianqian

在dubbo-admin平臺上檢視