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。
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
- JDK：1.6
-
Dubbo版2号：2.5.4-SNAPSHOT
- Spring版本号：3.2.16.RELEASE<
- ZooKeeper版本号：3.3.3
- Jedis版本号：2.1.0
- Netty版本号：3.2.5.Final
- 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>${project.parent.version}</version>
</dependency>
b) 配置文件（dubbo-demo-provider.xml）
其中<dubbo:servcie> 定义一个对外提供的接口，通过ref关联到具体的实现代码
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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
<bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl" />
<dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService" />
</beans>
c) 实现代码（DemoServiceImpl）
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package com.alibaba.dubbo.demo.provider;
import java.text.SimpleDateFormat;
import java.util.Date;
import com.alibaba.dubbo.demo.DemoService;
import com.alibaba.dubbo.rpc.RpcContext;
public class DemoServiceImpl implements DemoService {
public String sayHello(String name) {
System.out.println("[" + new SimpleDateFormat("HH:mm:ss").format(new Date()) + "] Hello " + name + ", request from consumer: " + RpcContext.getContext().getRemoteAddress());
return "Hello " + name + ", response form provider: " + RpcContext.getContext().getLocalAddress();
}
} 3、服务消费：dubbo-demo-consumer
a) 消费端也包含了对dubbo-demo-api的引用
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<dependency>
<groupId>com.alibaba</groupId>
<artifactId>dubbo-demo-api</artifactId>
<version>${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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xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.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);
}
}
}