消费Dubbo服务

创建maven项目 dubbo-demo-consumer
加入maven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>

编写dubbo消费服务配置文件dubbo-demo-consumer.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">
    <!-- 消费方应用名，用于计算依赖关系，不是匹配条件，不要与提供方一样 -->
    <dubbo:application name="demo-consumer" />
     <!-- 使用zookeeper注册中心暴露服务地址 -->
    <dubbo:registry address="zookeeper://127.0.0.1:2181"/>

    <!-- 生成远程服务代理，可以和本地bean一样使用demoProviderService  check属性，启动的时候是否检查 一般设置为false 启动的时候不检查-->
    <dubbo:reference id="demoProviderService" check="false" interface="com.hbk.dubbo.DemoProviderService"/>


</beans>

创建接口DemoProviderService.java

package com.hbk.dubbo;


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

编写消费服务测试类：

package com.hbk.dubbo;

import java.io.IOException;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ConsumerTest {

    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "dubbo-demo-consumer.xml" });
        context.start();
        DemoProviderService demoProviderService = (DemoProviderService) context.getBean("demoProviderService");
        String result=demoProviderService.sayHello("你好");
        System.out.println("远程调用结果："+result);
        try {
            System.in.read();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        context.close();
    }

}

先运行zookeeper,然后把上一节的提供者服务跑起来，再运行消费者服务，运行结果 远程调用结果：服务001

说明远程调用成功

同时查看Dubbo Admin管理控制台

需要注意的是，消费服务接口DemoProviderService的包路径一定要跟提供服务的接口路径一直，要不然会报以下错误：

Exception in thread "main" com.alibaba.dubbo.rpc.RpcException: No provider available from registry 127.0.0.1:2181 for service com.hbk.dubbo.consumer.DemoProviderService on consumer 100.0.0.84 use dubbo version 2.6.0, may be providers disabled or not registered ?
    at com.alibaba.dubbo.registry.integration.RegistryDirectory.doList(RegistryDirectory.java:572)
    at com.alibaba.dubbo.rpc.cluster.directory.AbstractDirectory.list(AbstractDirectory.java:73)
    at com.alibaba.dubbo.rpc.cluster.support.AbstractClusterInvoker.list(AbstractClusterInvoker.java:265)
    at com.alibaba.dubbo.rpc.cluster.support.AbstractClusterInvoker.invoke(AbstractClusterInvoker.java:224)
    at com.alibaba.dubbo.rpc.cluster.support.wrapper.MockClusterInvoker.invoke(MockClusterInvoker.java:70)
    at com.alibaba.dubbo.rpc.proxy.InvokerInvocationHandler.invoke(InvokerInvocationHandler.java:51)
    at com.alibaba.dubbo.common.bytecode.proxy0.sayHello(proxy0.java)
    at com.hbk.dubbo.ConsumerTest.main(ConsumerTest.java:15)

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