搭建第一个dubbo样例

dubbo作为开源的rpc框架，其功能和优点本文不做描述，其开源项目地址：http://dubbo.io/ 。本文主要讲述搭建一个dubbo开发环境和样例，包括基于 zookeeper服务注册中心，provider，consumer和服务治理后台。

1. 搭建zookeeper服务注册中心
   zookeeper部署分单机部署和机群部署，具体部署步骤可以自己度娘，也可以参考：http://blog.csdn.net/shirdrn/article/details/7183503

2. 编写provider样例
   需要依赖spring，zookeeper client，dubbo-all jar包，pom文件如下：

   <dependencies>
    <dependency >
     <groupId >com.alibaba.external </groupId >
     <artifactId >sourceforge.spring </artifactId >
     <version >2.5.6 </version >
    </dependency >
   <dependency >
     <groupId >junit</groupId>
     <artifactId >junit</artifactId>
     <version >3.8.1 </version >
     <scope >test </scope >
   </dependency >
    <dependency >
      <groupId >com.alibaba.external </groupId >
      <artifactId >eclipse.aspectj.weaver </artifactId >
      <version >1.6.10 </version >
    </dependency >
    <dependency >
      <groupId >com.alibaba </groupId >
      <artifactId >dubbo</artifactId>
      <version >2.5.3 </version >
    </dependency >
    <dependency >
       <groupId >org.apache.zookeeper </groupId >
       <artifactId >zookeeper</artifactId>
       <version >3.4.5 </version >
   </dependency >
   <dependency >
       <groupId >com.github.sgroschupf </groupId >
       <artifactId >zkclient</artifactId>
       <version >0.1 </version >
   </dependency >
   </ dependencies>

   编写服务接口：

   public interface DemoService {
   
   public String sayHello(String name);
   }
   

   编写服务实现：

   public class DemoServiceImpl implements DemoService {
   
   
       @Override
       public String sayHello(String name) {
           System. out.println( "hello "+name);
           return "hello "+name;
       }
   
   }

   写配置文件：

   <?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:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" <span style="background-color: rgb(255, 255, 255);"><span style="color:#990000;">xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"</span></span> xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd <span style="color:#990000;">http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd</span> http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd" default-lazy-init="false" > <dubbo:application name="hello-world-app"></dubbo:application> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry address="zookeeper://10.10.53.183:4180?backup=10.10.53.183:4181,10.10.53.183:4182" check="false"></dubbo:registry> <!-- 要引用的服务 --> <dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoService"></dubbo:service> <!-- 和本地bean一样实现服务 --> <bean id="demoService" class="com.alibaba.dubbo.demo.provider.DemoServiceImpl" /> </beans>

3. 编写consumer样例
   pom文件同2中的provider
   写测试类：

   public class DubboConsumer {
   public static void main(String[] args) throws Exception {
       ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("conf/dubbo_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
   
       System. in.read();
   }
   }

   写配置文件：

   <?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:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" <span style="background-color: rgb(255, 255, 255);"><span style="color:#990000;">xmlns:dubbo="http://code.alibabatech.com/schema/dubbo"</span></span> xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd <span style="color:#990000;">http://code.alibabatech.com/schema/dubbo http://code.alibabatech.com/schema/dubbo/dubbo.xsd</span> http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd" default-lazy-init="false" > <dubbo:application name="consumer-of-helloworld-app"></dubbo:application> <!-- 使用zookeeper注册中心暴露服务地址 --> <dubbo:registry address="zookeeper://10.10.53.183:4180?backup=10.10.53.183:4181,10.10.53.183:4182" check="false"></dubbo:registry> <!-- 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>

4. 搭建服务治理后台
   搭建好后zookeeper注册中心，下载dubbo-admin.war 包，我从csdn上下载的，地址：http://download.csdn.net/detail/liweifengwf/7784901
   部署到tomcat或者jetty下面，还需要配置dubbo.properties配置文件，文件目录地址：/WEB-INF/dubbo.properties或者/${user.home}/dubbo.properties下，如果dubbo再WEB-INF下没有找到，就会到用户的目录下找。文件内容：
   dubbo.registry.address=zookeeper://127.0.0.1:4180 ##zookeeper地址
   dubbo.admin.root.password=root
   dubbo.admin.guest.password=guest
   启动 jetty，在浏览器输入ip：8080/dubbo/index.html 即可以看见dubbo管理员页面。