（三）发布Dubbo服务

我们现在来学习下发布Dubbo服务，主要参考dubbo开发包里的demo源码；由浅入深的讲解下这个小demo；

github地址：https://github.com/apache/incubator-dubbo/tree/dubbo-2.6.3

首先创建一个maven项目dubbo-demo-provider

pom.xml加入依赖：

<dependencies>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>dubbo</artifactId>
        <version>2.6.0</version>
    </dependency>
    <dependency>
        <groupId>com.101tec</groupId>
        <artifactId>zkclient</artifactId>
        <version>0.10</version>
    </dependency>
    <dependency>
        <groupId>org.apache.curator</groupId>
        <artifactId>curator-framework</artifactId>
        <version>4.0.1</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.46</version>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.25</version>
    </dependency>
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-lang3</artifactId>
        <version>3.4</version>
    </dependency>
    <dependency>
        <groupId>io.netty</groupId>
        <artifactId>netty-all</artifactId>
        <version>4.0.35.Final</version>
    </dependency>
</dependencies>

然后定义一个服务接口：

package com.wishwzp.service;

/**
 * 服务提供者接口
 * @author Administrator
 *
 */
public interface DemoProviderService {
    public String sayHello(String name);
}

再定义接口实现类：

package com.wishwzp.service.impl;

import com.wishwzp.service.DemoProviderService;

/**
 * 服务提供者接口实现类
 * @author Administrator
 *
 */
public class DemoProviderServiceImpl implements DemoProviderService{
    public String sayHello(String name) {
        return "服务员001";
    }
}

然后再搞个dubbo配置文件dubbo-demo-provider.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">

    <!-- 提供方应用名称, 用于计算依赖关系 -->
    <dubbo:application name="demo-provider"/>

    <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>

    <!-- 使用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880"/>

    <!-- service实现类作为本地的一个bean -->
    <bean id="demoProviderService" class="com.wishwzp.service.impl.DemoProviderServiceImpl"/>

    <!-- 声明需要暴露的服务接口 -->
    <dubbo:service interface="com.wishwzp.service.DemoProviderService" ref="demoProviderService"/>

</beans>

测试类：

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class ProviderTest {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"dubbo-demo-provider.xml"});
        context.start();
        System.out.println("服务提供者注册成功（端口：20880）");
        try {
            System.in.read();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

然后我们测试发布dubbo服务，

首先我们要先启动zookeeper服务，

然后我们运行测试类，发布服务注册到zookeeper注册中心去；

说明发布服务OK；