Dubbo系列(3)_官方Demo说明

一、本文目的

    通过Dubbo的官方Demo介绍，学会搭建一个简单的Dubbo程序，包括服务端、客户端、接口等。

Demo地址：https://github.com/alibaba/dubbo/tree/master/dubbo-demo

二、Demo概况

     1、Demo分为三个项目

            a) dubbo-demo-api：服务接口，服务端和客户端都需要引用

b)dubbo-demo-provider：包含对服务接口的引用和实现

c)dubbo-demo-consumer：包含对服务接口的引用和使用

2、Demo三个项目的父项目是：dubbo-demo

三、Demo引用的Jar包说明

1. JDK：1.6
2. Dubbo版2号：2.5.4-SNAPSHOT
3. Spring版本号：3.2.16.RELEASE<
4. ZooKeeper版本号：3.3.3
5. Jedis版本号：2.1.0
6. Netty版本号：3.2.5.Final
7. 其它：参考pom.xml     https://github.com/alibaba/dubbo/blob/master/pom.xml

四、Demo代码说明

1、服务接口：dubbo-demo-api

          本项目只包含一个接口及一个接口方法

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package com.alibaba.dubbo.demo;   public interface DemoService {       String sayHello(String name);   }

    2、服务实现：dubbo-demo-provider

a) 服务端包含了对dubbo-demo-api的引用及实现

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<dependency>         <groupId>com.alibaba</groupId>         <artifactId>dubbo-demo-api</artifactId>         <version>${project.parent.version}</version>     </dependency>

b) 配置文件（dubbo-demo-provider.xml）

其中<dubbo:servcie> 定义一个对外提供的接口，通过ref关联到具体的实现代码

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<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-2.5.xsd     http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">           <bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl" />           <dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService" />       </beans>

c) 实现代码（DemoServiceImpl）

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package com.alibaba.dubbo.demo.provider;   import java.text.SimpleDateFormat; import java.util.Date;   import com.alibaba.dubbo.demo.DemoService; import com.alibaba.dubbo.rpc.RpcContext;   public class DemoServiceImpl implements DemoService {       public String sayHello(String name) {         System.out.println("[" + new SimpleDateFormat("HH:mm:ss").format(new Date()) + "] Hello " + name + ", request from consumer: " + RpcContext.getContext().getRemoteAddress());         return "Hello " + name + ", response form provider: " + RpcContext.getContext().getLocalAddress();     }       }

    3、服务消费：dubbo-demo-consumer

  a) 消费端也包含了对dubbo-demo-api的引用

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<dependency>         <groupId>com.alibaba</groupId>         <artifactId>dubbo-demo-api</artifactId>         <version>${project.parent.version}</version>     </dependency>

b) 配置文件（dubbo-demo-consumer.xml）

通过<dubbo:reference>引用一个服务接口，客户端使用远程接口方法就和调用本地方法一致

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<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-2.5.xsd     http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd">       <dubbo:reference id="demoService" interface="com.alibaba.dubbo.demo.DemoService" />   </beans>

c) 消费端调用代码：DemoAction.java

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package com.alibaba.dubbo.demo.consumer;   import java.text.SimpleDateFormat; import java.util.Date;   import com.alibaba.dubbo.demo.DemoService;   public class DemoAction {           private DemoService demoService;       public void setDemoService(DemoService demoService) {         this.demoService = demoService;     }       public void start() throws Exception {         for (int i = 0; i < Integer.MAX_VALUE; i ++) {             try {                 String hello = demoService.sayHello("world" + i);                 System.out.println("[" + new SimpleDateFormat("HH:mm:ss").format(new Date()) + "] " + hello);             } catch (Exception e) {                 e.printStackTrace();             }             Thread.sleep(2000);         }     }   }

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