最简单的dubbo教程-快速入门《一》

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所需环境

zookeeper作为dubbo的注册中心，dubbo服务提供方和消费方都需要在zookeeper注册中心注册。
可参考：http://blog.csdn.net/jingyangv587/article/details/78901508
注意：启动后，请勿关闭！

开始搭建

1. 服务提供方和消费方都需要的包（这里我新建的maven工程为pom工程，将共同的项目依赖写到pom.xml中）

总的项目结构为
pom.xml文件内容为

<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.test</groupId>  <artifactId>dubbo-demo</artifactId>  <version>0.0.1-SNAPSHOT</version>  <packaging>pom</packaging>   <properties>        <motan.version>0.3.0</motan.version>        <!-- 在阿里巴巴内部广泛使用的GA版本为：2.4.9，强烈推荐此版本 -->        <dubbo.version>2.5.3</dubbo.version>        <dubbox.version>2.8.4</dubbox.version>        <spring.version>4.3.6.RELEASE</spring.version>        <java.version>1.7</java.version>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    </properties>    <dependencies>      <dependency>            <groupId>com.alibaba</groupId>            <artifactId>dubbo</artifactId>            <version>2.5.3</version>            <exclusions>                <exclusion>                    <groupId>org.springframework</groupId>                    <artifactId>spring</artifactId>                </exclusion>            </exclusions>        </dependency>        <dependency>            <groupId>com.github.sgroschupf</groupId>            <artifactId>zkclient</artifactId>            <version>0.1</version>        </dependency>        <!-- spring相关 -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-core</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-beans</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jdbc</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-web</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-webmvc</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-aop</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-tx</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-orm</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context-support</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-test</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jms</artifactId>            <version>${spring.version}</version>        </dependency>        <dependency>            <groupId>org.aspectj</groupId>            <artifactId>aspectjrt</artifactId>            <version>1.6.11</version>        </dependency>        <dependency>            <groupId>org.aspectj</groupId>            <artifactId>aspectjweaver</artifactId>            <version>1.6.11</version>        </dependency>    </dependencies>   <modules>    <module>demo-api</module>    <module>dubbo-consumer</module>    <module>dubbo-provider</module>   </modules></project>

2. 在demo-api中定义服务接口（注意服务提供方和消费方都需要依赖这个项目）

package com.test;public interface DemoService{       String sayHello(String name);  }

3. 服务提供方实现

项目结构
实现接口

package com.test;import org.springframework.stereotype.Service;import com.test.DemoService;@Service("demoService")public class DemoServiceImpl implements DemoService{    @Override    public String sayHello(String name) {        // TODO Auto-generated method stub        return name;     }  }

声明暴露服务：

<?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="dubbo_provider"  />      <!-- 使用zookeeper注册中心暴露服务地址 -->      <dubbo:registry address="zookeeper://127.0.0.1:2181" />       <!-- 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.test.DemoService" ref="demoService" />  </beans>

在springmvc.xml中扫描service注解并将dubbo-provider.xml中的相关的dubbo配置引入进来

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:util="http://www.springframework.org/schema/util" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://www.springframework.org/schema/aop           http://www.springframework.org/schema/aop/spring-aop-4.0.xsd           http://www.springframework.org/schema/beans           http://www.springframework.org/schema/beans/spring-beans-4.0.xsd           http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-4.0.xsd           http://www.springframework.org/schema/util         http://www.springframework.org/schema/util/spring-util-4.0.xsd"    default-autowire="byName">    <aop:aspectj-autoproxy />    <context:component-scan base-package="com.test" />    <import resource="classpath:dubbo-provider.xml" /></beans>

加载Spring配置，启动服务：

package com.test;import java.io.IOException;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Test {    public static void main(String[] args) throws Exception {        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:springmvc.xml");        context.start();        System.out.println("Dubbo provider start...");        try {            System.in.read();   // 按任意键退出        } catch (IOException e) {            e.printStackTrace();        }     }}

4. 服务消费者实现

项目结构
在dubbo-consumer.xml中声明所所需要消费的服务

<?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="dubbo_consumer" />             <!-- 使用multicast广播注册中心暴露发现服务地址 -->        <dubbo:registry  protocol="zookeeper" 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demoService -->        <dubbo:reference id="demoService" interface="com.test.DemoService" />    </beans>

在springmvc.xml中扫描service注解并将dubbo-consumer.xml中的相关的dubbo配置引入进来

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop"    xmlns:context="http://www.springframework.org/schema/context"    xmlns:util="http://www.springframework.org/schema/util" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://www.springframework.org/schema/aop           http://www.springframework.org/schema/aop/spring-aop-4.0.xsd           http://www.springframework.org/schema/beans           http://www.springframework.org/schema/beans/spring-beans-4.0.xsd           http://www.springframework.org/schema/context        http://www.springframework.org/schema/context/spring-context-4.0.xsd           http://www.springframework.org/schema/util         http://www.springframework.org/schema/util/spring-util-4.0.xsd"    default-autowire="byName">    <aop:aspectj-autoproxy />    <context:component-scan base-package="com.test" />    <import resource="classpath:/dubbo-consumer.xml" /></beans>

加载Spring配置，调用服务：

package com.test;import java.io.IOException;import org.springframework.context.support.ClassPathXmlApplicationContext;public class Test {    public static void main(String[] args) {        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] { "classpath:springmvc.xml" });        context.start();        DemoService demoService = (DemoService) context.getBean("demoService");        System.out.println(demoService.sayHello("哈哈哈"));        try {            System.in.read();        } catch (IOException e) {            e.printStackTrace();        }    }}

如果出现以下结果则调用成功

完整项目的git地址：https://gitee.com/jingyang3877/dubbo-demo.git

参考博客：https://www.cnblogs.com/Javame/p/3632473.html

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