Dubbo入门示例
1.新建一个maven项目
2.给项目新建三个模块：dubbo_api, dubbo_provider和dubbo_consumer
dubbo_api模块的作用是定义服务。服务是围绕服务提供方和服务消费方的，服务提供方（dubbo_provider）实现服务，而服务消费方（dubbo_consumer）调用服务。
3.完善dubbo_api模块
结构：
DemoService类用于定义接口，代码如下：
public interface DemoService { String sayHello(String name); }
pom.xml代码：
<?xml version="1.0" encoding="UTF-8"?> <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"> <parent> <artifactId>dubbo_demo</artifactId> <groupId>com.fz</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>dubbo_api</artifactId> </project>
4.完善dubbo_provider模块
结构：
首先在pom.xml文件中添加依赖：
<?xml version="1.0" encoding="UTF-8"?> <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"> <parent> <artifactId>dubbo_demo</artifactId> <groupId>com.fz</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>dubbo_provider</artifactId> <properties> <motan.version>0.3.0</motan.version> <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>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</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> <dependency> <groupId>com.fz</groupId> <artifactId>dubbo_api</artifactId> <version>1.0-SNAPSHOT</version> <scope>compile</scope> </dependency> </dependencies> </project>
dubbo-provider.xml文件用于声明暴露给外部的服务，代码如下：
<?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.fz.service.DemoService" ref="demoService"/> </beans>
springmvc.xml文件用于扫描service包中的注解，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.fz"/> <import resource="classpath:dubbo-provider.xml"/> </beans>
DemoServiceImpl类实现了DemoService的接口：
@Service("demoService")
public class DemoServiceImpl implements DemoService {
public String sayHello(String name) {
return name + ": Hello !";
}
}
Main是整个模块的启动类：
public class Main { public static void main(String[] args) { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("classpath:springmvc.xml"); context.start(); System.out.println("Dubbo provider is running..."); try { System.in.read();//按任意键退出 } catch (IOException e) { e.printStackTrace(); } } }
5.完善dubbo_consumer模块
结构：
在pom.xml文件中添加依赖：
<?xml version="1.0" encoding="UTF-8"?> <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"> <parent> <artifactId>dubbo_demo</artifactId> <groupId>com.fz</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>dubbo_consumer</artifactId> <properties> <motan.version>0.3.0</motan.version> <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-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${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> <dependency> <groupId>com.fz</groupId> <artifactId>dubbo_api</artifactId> <version>1.0-SNAPSHOT</version> <scope>compile</scope> </dependency> </dependencies> </project>
dubbo-consumer.xml声明暴露给外部的服务：
<?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.fz.service.DemoService" /> </beans>
springmvc.xml文件:
<?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.fz" /> <import resource="classpath:/dubbo-consumer.xml" /> </beans>
启动类Main：
public class Main { 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("Helios")); try { System.in.read(); } catch (IOException e) { e.printStackTrace(); } } }
6.运行
依次启动dubbo_provider和dubbo_consumer，执行结果如下。
