Dubbo 快速入门 代码示例

Dubbo 是由阿里巴巴开源的一个高性能、基于 Java 开源的远程调用框架。
下面是参考dubbo官网做的一个简单示例

1. 创建一个多模块项目

各个模块类型为 → Maven quick start

2. 具体代码示例

2.0 dubbo-parent

dubbo-parent 的 pom.xml

<?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">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.gy</groupId>
  <artifactId>dubbo-parent</artifactId>
  <packaging>pom</packaging>
  <version>1.0-SNAPSHOT</version>
  <modules>
    <module>dubbo-api</module>
    <module>dubbo-consumer</module>
    <module>dubbo-provider</module>
  </modules>

</project>

2.1 dubbo-api

接口 DemoService

package com.gy.api;

public interface DemoService {

    String sayHello(String name);

}

dubbo-api 的 pom.xml

<?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-parent</artifactId>
        <groupId>com.gy</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>dubbo-api</artifactId>

    <name>dubbo-api</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.0</version>
        </dependency>
    </dependencies>
</project>

2.2 dubbo-cumsumer

服务消费的类 consumer

package com.gy.consumer;

import com.gy.api.DemoService;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Consumer {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"classpath:applicationContext-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
    }
}

服务消费配置文件 applicationContext-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.gy.api.DemoService" />
</beans>

dubbo-consumer 的 pom.xml

<?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">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.gy</groupId>
  <artifactId>dubbo-consumer</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>dubbo-consumer</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <artifactId>dubbo-api</artifactId>
      <groupId>com.gy</groupId>
      <version>1.0-SNAPSHOT</version>
    </dependency>
  </dependencies>

</project>

2.3 dubbo-provider

服务发布的类 Provider

package com.gy.run;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Provider {

    public static void main(String[] args) throws Exception{
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"classpath:applicationContext-provider.xml"});
        context.start();
        System.out.println("服务发布成功");
        System.in.read(); // 按任意键退出
    }
}

接口的实现类 DemoServiceImpl

package com.gy.service;

import com.gy.api.DemoService;

public class DemoServiceImpl implements DemoService {

    public String sayHello(String name) {
        return "Hello " + name;

    }
}

服务发布的配置文件 applicationContext-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.gy.api.DemoService" ref="demoService" />

    <!-- 和本地bean一样实现服务 -->
    <bean id="demoService" class="com.gy.service.DemoServiceImpl" />
</beans>

dubbo-provider 的 pom.xml

<?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-parent</artifactId>
    <groupId>com.gy</groupId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>

  <artifactId>dubbo-provider</artifactId>

  <name>dubbo-provider</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <artifactId>dubbo-api</artifactId>
      <groupId>com.gy</groupId>
      <version>1.0-SNAPSHOT</version>
    </dependency>
  </dependencies>

</project>

3. 测试

启动 Provider 类 → 发布

服务发布成功

接着启动 Consumer 类 → 消费

Hello world