dubbo 的使用

jopen 9年前

Dubbo是[3] 阿里巴巴公司开源的一个高性能优秀的服务框架，使得应用可通过高性能的 RPC 实现服务的输

出和输入功能，可以和 [4] Spring框架无缝集成。

主要核心部件

Remoting: 网络通信框架，实现了 sync-over-async 和 request-response 消息机制.

RPC: 一个远程过程调用的抽象，支持负载均衡、容灾和集群功能

Registry: 服务目录框架用于服务的注册和服务事件发布和订阅

工作原理

dubbo 的使用

Provider

暴露服务方称之为“服务提供者”。

Consumer

调用远程服务方称之为“服务消费者”。

Registry

服务注册与发现的中心目录服务称之为“服务注册中心”。

Monitor

统计服务的调用次数和调用时间的日志服务称之为“服务监控中心”。

(1) 连通性：

注册中心负责服务地址的注册与查找，相当于目录服务，服务提供者和消费者只在启动时与注册中心交互，注册中心不转发请求，压力较小

监控中心负责统计各服务调用次数，调用时间等，统计先在内存汇总后每分钟一次发送到监控中心服务器，并以报表展示

服务提供者向注册中心注册其提供的服务，并汇报调用时间到监控中心，此时间不包含网络开销

服务消费者向注册中心获取服务提供者地址列表，并根据负载算法直接调用提供者，同时汇报调用时间到监控中心，此时间包含网络开销

注册中心，服务提供者，服务消费者三者之间均为长连接，监控中心除外

注册中心通过长连接感知服务提供者的存在，服务提供者宕机，注册中心将立即推送事件通知消费者

注册中心和监控中心全部宕机，不影响已运行的提供者和消费者，消费者在本地缓存了提供者列表

注册中心和监控中心都是可选的，服务消费者可以直连服务提供者

(2) 健状性：

监控中心宕掉不影响使用，只是丢失部分采样数据

数据库宕掉后，注册中心仍能通过缓存提供服务列表查询，但不能注册新服务

注册中心对等集群，任意一台宕掉后，将自动切换到另一台

注册中心全部宕掉后，服务提供者和服务消费者仍能通过本地缓存通讯

服务提供者无状态，任意一台宕掉后，不影响使用

服务提供者全部宕掉后，服务消费者应用将无法使用，并无限次重连等待服务提供者恢复

(3) 伸缩性：

注册中心为对等集群，可动态增加机器部署实例，所有客户端将自动发现新的注册中心

服务提供者无状态，可动态增加机器部署实例，注册中心将推送新的服务提供者信息给消费者

以下是需要的ZooKeeper 安装，和管理页面的安装，测试的提供者和消费者。

所需的文件下载地址：http://download.csdn.net/detail/liuc0317/8314333

1. 我在windows 下安装的zooKeeper ，所下载的文件 zookeeper-3.3.6.tar.gz 解压到一个文件夹下。如图

dubbo 的使用

目录如图：

dubbo 的使用

进入conf 修改配置文件 zoo.cfg 

# The number of milliseconds of each tick  心跳间隔 毫秒每次    tickTime=2000    # The number of ticks that the initial    # synchronization phase can take    initLimit=10    # The number of ticks that can pass between    # sending a request and getting anacknowledgement    syncLimit=5    # the directory where the snapshot isstored.  //镜像数据位置    dataDir=D:\\data\\zookeeper    #日志位置    dataLogDir=D:\\logs\\zookeeper    # the port at which the clients willconnect  客户端连接的端口    clientPort=2181

修改了配置文件dataLogDir 的配置，这个配置地址需要人为的去创建，要不然会报错。这样，配置就基本完成了。

第二步：进入bin 目录，然后在 dos 下运行。

这样 zookeeper 就启动了，同时可以使用zookeeper 自带的客户端查看一下。如图：

编写服务的提供者和消费者 如图：

dubbo 的使用

DemoService.java 

package com.unj.dubbotest.provider;        import java.util.List;        public interface DemoService {            String sayHello(String name);            public List getUsers();        }

DemoServiceImp.java 

package com.unj.dubbotest.provider.impl;        import java.util.ArrayList;    import java.util.List;        import com.unj.dubbotest.provider.DemoService;        public class DemoServiceImpl implements DemoService {            public String sayHello(String name) {            return "Hello " + name;        }            public List getUsers() {            List list = new ArrayList();            User u1 = new User();            u1.setName("jack");            u1.setAge(20);            u1.setSex("m");                User u2 = new User();            u2.setName("tom");            u2.setAge(21);            u2.setSex("m");                User u3 = new User();            u3.setName("rose");            u3.setAge(19);            u3.setSex("w");                list.add(u1);            list.add(u2);            list.add(u3);            return list;        }    }

applicationContext.xml 

<?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            ">            <!-- 具体的实现bean -->        <bean id="demoService" class="com.unj.dubbotest.provider.impl.DemoServiceImpl" />            <!-- 提供方应用信息，用于计算依赖关系 -->        <dubbo:application name="xixi_provider" />            <!-- 使用multicast广播注册中心暴露服务地址 <dubbo:registry address="multicast://224.5.6.7:1234"             /> -->            <!-- 使用zookeeper注册中心暴露服务地址 -->        <dubbo:registry address="zookeeper://10.20.5.106:2181" />            <!-- 用dubbo协议在20880端口暴露服务 -->        <dubbo:protocol name="dubbo" port="20880" />            <!-- 声明需要暴露的服务接口 -->        <dubbo:service interface="com.unj.dubbotest.provider.DemoService"            ref="demoService" />        </beans>

Provider.java 

package com.unj.dubbotest.provider.impl;        import org.springframework.context.support.ClassPathXmlApplicationContext;        public class Provider {            public static void main(String[] args) throws Exception {            ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(                    new String[] { "applicationContext.xml" });            context.start();            System.in.read(); // 为保证服务一直开着，利用输入流的阻塞来模拟        }    }

运行main 方法：日志如下： 

2014-12-30 15:45:46,349 INFO [org.springframework.context.support.ClassPathXmlApplicationContext]   - Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@dd87b2: display name   [org.springframework.context.support.ClassPathXmlApplicationContext@dd87b2];   startup date [Tue Dec 30 15:45:46 CST 2014]; root of context hierarchy    2014-12-30 15:45:46,410 INFO [org.springframework.beans.factory.xml.XmlBeanDefinitionReader]   - Loading XML bean definitions from class path resource [applicationContext.xml]    2014-12-30 15:45:46,554 INFO [com.alibaba.dubbo.common.logger.LoggerFactory]   - using logger: com.alibaba.dubbo.common.logger.log4j.Log4jLoggerAdapter    2014-12-30 15:45:46,585 INFO [org.springframework.context.support.ClassPathXmlApplicationContext]   - Bean factory for application context [org.springframework.context.support.ClassPathXmlApplicationContext@dd87b2]:   org.springframework.beans.factory.support.DefaultListableBeanFactory@1319c    2014-12-30 15:45:46,831 INFO [org.springframework.beans.factory.support.DefaultListableBeanFactory]   - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1319c: defining beans   [demoService,xixi_provider,com.alibaba.dubbo.config.RegistryConfig,dubbo,  com.unj.dubbotest.provider.DemoService]; root of factory hierarchy    2014-12-30 15:45:46,834 INFO [com.alibaba.dubbo.config.AbstractConfig]   -  [DUBBO] The service ready on spring started. service:   com.unj.dubbotest.provider.DemoService, dubbo version: 2.5.2, current host: 127.0.0.1    2014-12-30 15:45:46,992 INFO [com.alibaba.dubbo.config.AbstractConfig]   -  [DUBBO] Export dubbo service com.unj.dubbotest.provider.DemoService to local registry,   dubbo version: 2.5.2, current host: 127.0.0.1    2014-12-30 15:45:46,992 INFO [com.alibaba.dubbo.config.AbstractConfig]   -  [DUBBO] Export dubbo service com.unj.dubbotest.provider.DemoService to url   dubbo://10.20.5.106:20880/com.unj.dubbotest.provider.DemoService?anyhost=true&application  =xixi_provider&dubbo=2.5.2&interface=com.unj.dubbotest.provider.DemoService&methods  =sayHello,getUsers&pid=12192&side=provider×tamp=1419925546891, dubbo version: 2.5.2,   current host: 127.0.0.1  2014-12-30 15:45:46,992 INFO [com.alibaba.dubbo.config.AbstractConfig]   -  [DUBBO] Register dubbo service com.unj.dubbotest.provider.DemoService url   dubbo://10.20.5.106:20880/com.unj.dubbotest.provider.DemoService?anyhost  =true&application=xixi_provider&dubbo=2.5.2&interface=com.unj.dubbotest.provider.DemoService&methods  =sayHello,getUsers&pid=12192&side=provider×tamp=1419925546891 to   registry registry://10.20.5.106:2181/com.alibaba.dubbo.registry.RegistryService?application  =xixi_provider&dubbo=2.5.2&pid=12192&registry=zookeeper×tamp=1419925546845,   dubbo version: 2.5.2, current host: 127.0.0.1    2014-12-30 15:45:47,161 INFO [com.alibaba.dubbo.remoting.transport.AbstractServer]   -  [DUBBO] Start NettyServer bind /0.0.0.0:20880, export /10.20.5.106:20880,   dubbo version: 2.5.2, current host: 127.0.0.1    2014-12-30 15:45:47,183 INFO [com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry]   -  [DUBBO] Load registry store file C:\Users\lenovo\.dubbo\dubbo-registry-10.20.5.106.cache,   data: {com.unj.dubbotest.provider.DemoService  =empty://10.20.5.106/com.unj.dubbotest.provider.DemoService?application  =hehe_consumer&category=providers&dubbo  =2.5.2&interface=com.unj.dubbotest.provider.DemoService&methods  =sayHello,getUsers&pid=21892&side=consumer×tamp  =1419925451328 empty://10.20.5.106/com.unj.dubbotest.provider.DemoService?application  =hehe_consumer&category=configurators&dubbo=2.5.2&interface  =com.unj.dubbotest.provider.DemoService&methods=sayHello,getUsers&pid  =21892&side=consumer×tamp  =1419925451328 empty://10.20.5.106/com.unj.dubbotest.provider.DemoService?application  =hehe_consumer&category=routers&dubbo  =2.5.2&interface=com.unj.dubbotest.provider.DemoService&methods  =sayHello,getUsers&pid=21892&side  =consumer×tamp=1419925451328}, dubbo version: 2.5.2, current host: 127.0.0.1    2014-12-30 15:45:47,198 INFO [org.I0Itec.zkclient.ZkEventThread]   - Starting ZkClient event thread.    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper]   - Client environment:zookeeper.version=3.4.5-1392090, built on 09/30/2012 17:52 GMT    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper]   - Client environment:host.name=10.20.5.106    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper]   - Client environment:java.version=1.6.0_30    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper]   - Client environment:java.vendor=Sun Microsystems Inc.    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper]   - Client environment:java.home=D:\soft\UCFSOFTDOC\soft\JDK\Java_JDK1.6_32bit\Java\jdk1.6.0_30\jre    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper]  - Client environment:java.class.path  =C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\classes;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\commons-lang-2.3.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\commons-logging-1.1.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\commons-logging-api-1.1.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\dubbo-2.5.2.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\dubbo-admin-2.5.2-sources.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\dubbo-demo-consumer-2.5.2-sources.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\dubbo-demo-provider-2.5.2-sources.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\dubbo-registry-simple-2.5.2-sources.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\javassist-3.4.GA.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\jline-0.9.94.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\netty-3.2.2.Final.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\netty-3.2.5.Final.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-aop.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-beans.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-context-support.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-context.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-core.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-jdbc.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-jms.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-orm.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-test.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-tx.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-web.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-webmvc-portlet.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-webmvc-struts.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring-webmvc.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\spring.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\zkclient-0.1.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\zookeeper-3.4.5.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\log4j-1.2.12.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\slf4j-api-1.6.1.jar;  C:\Users\lenovo\Downloads\provider\dubboprovider\WebRoot\WEB-INF\lib\slf4j-log4j12-1.6.1.jar    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper]   - Client environment:java.library.path=D:\soft\UCFSOFTDOC\soft\JDK\Java_JDK1.6_32bit\Java\jdk1.6.0_30\bin;  C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;  C:/Program Files (x86)/Java/jre7/bin/client;  C:/Program Files (x86)/Java/jre7/bin;C:/Program Files (x86)/Java/jre7/lib/i386;  C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;  C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;  C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\OpenCL SDK\3.0\bin\x86;  C:\Program Files (x86)\Intel\OpenCL SDK\3.0\bin\x64;  C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;  C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;  C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;  C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;  D:\soft\UCFSOFTDOC\soft\JDK\Java_JDK1.6_32bit\Java\jdk1.6.0_30\bin;  D:\Program Files\TortoiseSVN\bin;  D:\soft\UCFSOFTDOC\soft\Maven\apache-maven-3.1.1_20140127\apache-maven-3.1.1\bin;  C:\Program Files (x86)\OpenV*N\bin;D:\soft\UCFSOFTDOC\soft\IDE\eclipse_JAVAEE;;.    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper]   - Client environment:java.io.tmpdir=C:\Users\lenovo\AppData\Local\Temp\    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper]  - Client environment:java.compiler=<NA>    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper] - Client environment:os.name=Windows 7    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper] - Client environment:os.arch=x86    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper] - Client environment:os.version=6.1    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper] - Client environment:user.name=lenovo    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper] - Client environment:user.home=C:\Users\lenovo    2014-12-30 15:45:47,217 INFO [org.apache.zookeeper.ZooKeeper] - Client environment:user.dir=  C:\Users\lenovo\Downloads\provider\dubboprovider    2014-12-30 15:45:47,218 INFO [org.apache.zookeeper.ZooKeeper]   - Initiating client connection, connectString=10.20.5.106:2181 sessionTimeout  =30000 watcher=org.I0Itec.zkclient.ZkClient@2acc57    2014-12-30 15:45:47,239 INFO [org.apache.zookeeper.ClientCnxn]   - Opening socket connection to server 10.20.5.106/10.20.5.106:2181. Will   not attempt to authenticate using SASL (无法定位登录配置)    2014-12-30 15:45:47,240 INFO [org.apache.zookeeper.ClientCnxn]   - Socket connection established to 10.20.5.106/10.20.5.106:2181, initiating session    2014-12-30 15:45:47,306 WARN [org.apache.zookeeper.ClientCnxnSocket]   - Connected to an old server; r-o mode will be unavailable    2014-12-30 15:45:47,306 INFO [org.apache.zookeeper.ClientCnxn]   - Session establishment complete on server 10.20.5.106/10.20.5.106:2181,   sessionid = 0x14a9a27ba100000, negotiated timeout = 30000    2014-12-30 15:45:47,309 INFO [org.I0Itec.zkclient.ZkClient]   - zookeeper state changed (SyncConnected)    2014-12-30 15:45:47,312 INFO [com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry]   -  [DUBBO] Register: dubbo://10.20.5.106:20880/com.unj.dubbotest.provider.DemoService?anyhost=true&application  =xixi_provider&dubbo=2.5.2&interface=com.unj.dubbotest.provider.DemoService&methods  =sayHello,getUsers&pid=12192&side=provider×tamp=1419925546891, dubbo version: 2.5.2, current host: 127.0.0.1    2014-12-30 15:45:47,446 INFO [com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry]   -  [DUBBO] Subscribe: provider://10.20.5.106:20880/com.unj.dubbotest.provider.DemoService?anyhost=true&application  =xixi_provider&category=configurators✓=false&dubbo=2.5.2&interface  =com.unj.dubbotest.provider.DemoService&methods=sayHello,getUsers&pid  =12192&side=provider×tamp=1419925546891, dubbo version: 2.5.2, current host: 127.0.0.1    2014-12-30 15:45:47,559 INFO [com.alibaba.dubbo.registry.zookeeper.ZookeeperRegistry]   -  [DUBBO] Notify urls for subscribe url provider://10.20.5.106:20880/com.unj.dubbotest.provider.DemoService?anyhost  =true&application=xixi_provider&category=configurators✓=false&dubbo=2.5.2&interface  =com.unj.dubbotest.provider.DemoService&methods=sayHello,getUsers&pid=12192&side  =provider×tamp=1419925546891, urls: [empty://10.20.5.106:20880/com.unj.dubbotest.provider.DemoService?anyhost  =true&application=xixi_provider&category=configurators✓=false&dubbo=2.5.2&interface  =com.unj.dubbotest.provider.DemoService&methods=sayHello,getUsers&pid=12192&side  =provider×tamp=1419925546891], dubbo version: 2.5.2, current host: 127.0.0.1

这样 就在 zookeeper 的控制页面中就会查询到 此服务 如图：

编写服务的消费者 项目如图：

dubbo 的使用

DemoService.java 这个 服务提供者 提供的服务类，在实际开发中，需要提供者把这个类，打成一个jar 包提供给调用者。 

package com.unj.dubbotest.provider;        import java.util.List;        public interface DemoService {            String sayHello(String name);            public List getUsers();        }

Consumer.java 

package com.alibaba.dubbo.demo.pp;        import java.util.List;        import org.springframework.context.support.ClassPathXmlApplicationContext;        import com.unj.dubbotest.provider.DemoService;        public class Consumer {            public static void main(String[] args) throws Exception {            ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(                    new String[] { "applicationContext.xml" });            context.start();                DemoService demoService = (DemoService) context.getBean("demoService");            String hello = demoService.sayHello("tom");            System.out.println(hello);                List list = demoService.getUsers();            if (list != null && list.size() > 0) {                for (int i = 0; i < list.size(); i++) {                    System.out.println(list.get(i));                }            }            System.in.read();        }        }

applicationContext.xml 

<?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            ">            <!-- 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="hehe_consumer" />            <!-- 使用zookeeper注册中心暴露服务地址 -->        <!-- <dubbo:registry address="multicast://224.5.6.7:1234" /> -->        <dubbo:registry address="zookeeper://10.20.5.106:2181" />            <!-- 生成远程服务代理，可以像使用本地bean一样使用demoService -->        <dubbo:reference id="demoService"    interface="com.unj.dubbotest.provider.DemoService" />        </beans>

运行的结果：

dubbo 的使用

这样就调用完了。

原文  http://www.uml.org.cn/zjjs/201512281.asp