Dubbo 第一个栗子

一、创建一个基础Maven工程，作为通用的接口

pom.xml 文件

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  <modelVersion>4.0.0</modelVersion>  <groupId>com.imagno</groupId>  <artifactId>common</artifactId>  <version>0.0.1-SNAPSHOT</version>  <name>common</name>  <url>http://maven.apache.org</url>  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties></project>

通用接口文件

package com.imagno.common;public interface UserService {public String getUser(Integer i);}

二、提供者

pom.xml  配置文件

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  <modelVersion>4.0.0</modelVersion>  <groupId>com.imagno</groupId>  <artifactId>producer</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>jar</packaging>  <name>producer</name>  <url>http://maven.apache.org</url>  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties>  <dependencies>  <dependency>    <groupId>com.alibaba</groupId>    <artifactId>dubbo</artifactId>    <version>2.5.7</version></dependency><dependency><groupId>com.github.sgroschupf</groupId><artifactId>zkclient</artifactId><version>0.1</version></dependency>        <!-- 上面第一节的通用公共接口，为了减少代码冗余及工作量 --><dependency><groupId>com.imagno</groupId><artifactId>common</artifactId><version>0.0.1-SNAPSHOT</version></dependency>  </dependencies></project>

java 服务层实现类

package com.imagno.producer.impl;import com.imagno.common.UserService;public class UserServiceImpl implements UserService {public String getUser(Integer i) {System.out.println("被消息过1次");if (i == 1) {return "Java";}if (i == 2) {return "C++";}return "Go";}}

package com.imagno.producer;import java.io.IOException;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Provider {public static void main(String[] args) throws IOException {ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "producer.xml" });context.start();System.out.println("生产者启动中!");System.in.read(); //让程序阻塞}}

dubbo 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">      <!-- 提供方应用名称信息，这个相当于起一个名字，我们dubbo管理页面比较清晰是哪个应用暴露出来的 -->    <dubbo:application name="dubbo_provider"></dubbo:application>        <!--zookeeper注册中心 -->      <dubbo:registry address="zookeeper://127.0.0.1:2181" />      <!--使用multicast广播注册中心暴露服务地址 -->      <!-- <dubbo:registry address="multicast://10.10.8.101:20881" /> -->      <dubbo:protocol name="dubbo" port="20881" />          <dubbo:service interface="com.imagno.common.UserService" ref="userService"/>    <bean id="userService" class="com.imagno.producer.impl.UserServiceImpl"/></beans>

三、消费者

pom.xml 文件

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">  <modelVersion>4.0.0</modelVersion>  <groupId>com.imagno</groupId>  <artifactId>customer</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>jar</packaging>  <name>customer</name>  <url>http://maven.apache.org</url>  <properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  </properties>  <dependencies>  <dependency>    <groupId>com.alibaba</groupId>    <artifactId>dubbo</artifactId>    <version>2.5.7</version></dependency><dependency><groupId>com.github.sgroschupf</groupId><artifactId>zkclient</artifactId><version>0.1</version></dependency>        
        <!-- 上面第一节的通用公共接口，为了减少代码冗余及工作量 -->
 <dependency><groupId>com.imagno</groupId><artifactId>common</artifactId><version>0.0.1-SNAPSHOT</version></dependency> </dependencies></project>


消费者java类

package com.imagno.customer;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.imagno.common.UserService;public class Customer {public static void main(String[] args) {ClassPathXmlApplicationContext app = new ClassPathXmlApplicationContext("customer.xml");app.start();UserService userService = (UserService)app.getBean("userService");String name = userService.getUser(2);System.out.println(name);}}

dubbo配置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-app"/>        <!--zookeeper注册中心 -->    <dubbo:registry address="zookeeper://127.0.0.1:2181" />        <!-- 生成远程服务代理，可以和本地bean一样使用 -->    <dubbo:reference id="userService" interface="com.imagno.common.UserService"/></beans>