Dubbo注册和管理服务

Dubbo采用全Spring配置方式，透明化接入应用，对应用没有任何API侵入，只需用Spring加载Dubbo的配置即可，Dubbo基于Spring的Schema扩展进行加载。

服务提供者

定义服务接口: (该接口需单独打包，在服务提供方和消费方共享)

DemoService.java

DemoService.java

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

在服务提供方实现接口：(对服务消费方隐藏实现)

DemoServiceImpl.java

package com.alibaba.dubbo.demo.provider; import com.alibaba.dubbo.demo.DemoService;   public class DemoServiceImpl implements DemoService {          public String sayHello(String name) {          return "Hello " + name;      } }

用Spring配置声明暴露服务：

provider.xml

<? 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"      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">        <!-- 提供方应用信息，用于计算依赖关系 -->      < dubbo:application name = "hello-world-app" />      <!-- 使用multicast广播注册中心暴露服务地址 -->      < dubbo:registry address = "multicast://224.5.6.7:1234" />      <!-- 用dubbo协议在20880端口暴露服务 -->      < dubbo:protocol name = "dubbo" port = "20880" />      <!-- 声明需要暴露的服务接口 -->      < dubbo:service interface = "com.alibaba.dubbo.demo.DemoService" ref = "demoService" />      <!-- 和本地bean一样实现服务 -->      < bean id = "demoService" class = "com.alibaba.dubbo.demo.provider.DemoServiceImpl" /> </ beans >

加载Spring配置：

Provider.java

import org.springframework.context.support.ClassPathXmlApplicationContext; public class Provider {      public static void main(String[] args) throws Exception {          ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext( new String[] { "provider.xml" });          context.start();          System.in.read(); // 按任意键退出      } }

服务消费者

通过Spring配置引用远程服务：

consumer.xml

<? 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"      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">        <!-- 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 = "consumer-of-helloworld-app" />      <!-- 使用multicast广播注册中心暴露发现服务地址 -->      < dubbo:registry address = "multicast://224.5.6.7:1234" />      <!-- 生成远程服务代理，可以和本地bean一样使用demoService -->      < dubbo:reference id = "demoService" interface = "com.alibaba.dubbo.demo.DemoService" /> </ beans >

加载Spring配置，并调用远程服务：(也可以使用IoC注入)

Consumer.java

import org.springframework.context.support.ClassPathXmlApplicationContext; import com.alibaba.dubbo.demo.DemoService; public class Consumer {      public static void main(String[] args) throws Exception {          ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext( new String[] { "consumer.xml" });          context.start();          DemoService demoService = (DemoService)context.getBean( "demoService" ); // 获取远程服务代理          String hello = demoService.sayHello( "world" ); // 执行远程方法          System.out.println( hello ); // 显示调用结果      } }