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。

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);
        }
    }
 
}












posted @ 2016-10-30 13:58  扯  阅读(3250)  评论(1)  编辑  收藏  举报