项目组采用分布式服务，线上有几十个应用，RPC调用完全依靠Dubbo。平时开发一直都是用其他人搭好的dubbo环境，最近自己抽空独立的搭建dubbo小demo，一个服务端，一个客户端。
一 服务端
服务端maven父工程
首先搭建一个maven父工程，引入dubbo和spring的依赖，dubbo可以和spring无缝集成。
<properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <v.dubbo.ext>1.3.0-SNAPSHOT</v.dubbo.ext> <v.spring>3.1.2.RELEASE</v.spring> <v.plugin.jar>2.3.1</v.plugin.jar> </properties> <dependencies> <dependency> <groupId>com.jd.dubbo.ext</groupId> <artifactId>dubbo-ext-spi</artifactId> <version>${v.dubbo.ext}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${v.spring}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${v.spring}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${v.spring}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${v.spring}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${v.spring}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${v.spring}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${v.spring}</version> </dependency> </dependencies>服务端接口子模块
这个模块负责向第三方应用暴露接口的定义，实现在其它的包里。third party 应用需要引入这个包，但无法看到接口的实现。
这个模块十分简单，只需提供接口定义。
package org.dubbo.server.api;public interface DemoService { public String sayHello(String name); }服务端接口实现子模块
重新创建一个maven module，这个模块负责实现上面模块定义的接口。
实现如下：
package org.dubbo.server.service;import org.dubbo.server.api.DemoService;import org.springframework.stereotype.Service;@Service("demoService")public class DemoServiceImpl implements DemoService{ public String sayHello(String name) { return "Hello " + name; } }package org.dubbo.server.service;import org.springframework.context.support.ClassPathXmlApplicationContext;public class DubboServer { 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 } }
好，服务端跑起来了。
服务端dubbo配置
<?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" xmlns:context="http://www.springframework.org/schema/context" 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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd" default-autowire="byName"> <context:component-scan base-package="org.dubbo.server.service.**" /> <!-- 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" organization="risk.im.jd.com" owner="lvsheng" /> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry id="registry" address="10.28.163.15:6060" /> <dubbo:protocol id="protocol" name="dubbo" port="25000" heartbeat="0" threadpool="cached" threads="512" /> <dubbo:provider id="im.riskctrl.dubbo.provider" timeout="5000" retries="5" loadbalance="roundrobin" cluster="failover" registry="registry"> </dubbo:provider> <!-- 生成远程服务代理，可以像使用本地bean一样使用demoService --> <dubbo:service interface="org.dubbo.server.api.DemoService" ref="demoService" provider="im.riskctrl.dubbo.provider" > </dubbo:service></beans> 二 注册中心
dubbo注册中心我使用的是dubbo官网的注册中心demo。
三 客户端
客户端简单的搭建一个普通的maven工程就行了。pom依赖跟服务端的一致。
客户端的调用代码如下：
package com.jd.lvsheng.dubbo.client.test;import org.dubbo.server.api.DemoService;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.stereotype.Service;@Service("dubboConsumer")public class DubboConsumer { public static void main(String[] args) throws Exception { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "applicationContext.xml" }); context.start(); DemoService demoService = context.getBean("demoService", DemoService.class); System.out.println(demoService.sayHello("aaa")); System.in.read(); }}<?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" xmlns:context="http://www.springframework.org/schema/context" 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 http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd" default-autowire="byName"> <!-- 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="dubbo_consumer" organization="risk.im.com" owner="lvsheng" /> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry id="registry" address="10.28.163.15:6060" /> <dubbo:protocol id="protocol" name="dubbo" port="25001" heartbeat="0" threadpool="cached" threads="512" /> <dubbo:provider id="im.riskctrl.dubbo.provider" timeout="5000" retries="5" loadbalance="roundrobin" cluster="failover" registry="registry"> </dubbo:provider> <!-- 生成远程服务代理，可以像使用本地bean一样使用demoService --> <dubbo:reference interface="org.dubbo.server.api.DemoService" id="demoService" registry="registry"> </dubbo:reference></beans>