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