dubbo学习笔记1

DUBBO入门

官方文档:https://dubbo.gitbooks.io/dubbo-user-book/content/preface/

服务提供者

项目结构:



pom文件:

<?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.xh.dubbo.demon</groupId>
    <artifactId>demon_provider</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>demon_api</module>
        <module>demon_pro</module>
    </modules>
    <name>demon_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>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

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

api

接口:

package com.xh.dubbo.demon.service;

/**
 * Created by root on 4/10/18.
 */
public interface SayHello {
    public String hello(String name);
}

pom文件:

默认

实现

实现类:

package com.xh.dubbo.demon.serviceImpl;

import com.xh.dubbo.demon.service.SayHello;

/**
 * Created by root on 4/10/18.
 */
public class SayHelloImpl implements SayHello {
    @Override
    public String hello(String name) {
        return "Hello " + name;
    }
}

启动类:

package com.xh.dubbo.demon;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

/**
 * Hello world!
 */
public class App {
    public static void main(String[] args) throws IOException {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"classpath:provider.xml"});
        context.start();
        System.in.read(); // 按任意键退出
    }
}

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: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.xh.dubbo.demon.service.SayHello" ref="helloImpl"/>

    <!-- 和本地bean一样实现服务 -->
    <bean id="helloImpl" class="com.xh.dubbo.demon.serviceImpl.SayHelloImpl"/>
</beans>

pom文件:

<?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>demon_provider</artifactId>
        <groupId>com.xh.dubbo.demon</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>demon_pro</artifactId>
    <packaging>jar</packaging>
    <name>demon_pro</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>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>com.xh.dubbo.demon</groupId>
            <artifactId>demon_api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
        </dependency>
    </dependencies>

    <build>
...
    </build>
</project>

服务消费者

项目结构:

调用服务:

package com.xh.dubbo.demon;

import com.xh.dubbo.demon.service.SayHello;
import org.springframework.context.support.ClassPathXmlApplicationContext;

/**
 * Hello world!
 */
public class App {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"classpath:consumer.xml"});
        context.start();
        SayHello demoService = (SayHello) context.getBean("demoService"); // 获取远程服务代理
        String hello = demoService.hello("nana "); // 执行远程方法
        System.out.println(hello); // 显示调用结果
    }
}

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: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.xh.dubbo.demon.service.SayHello"/>
</beans>

pom文件:

<?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.xh.dubbo.demon</groupId>
    <artifactId>demon_consumer</artifactId>
    <version>1.0-SNAPSHOT</version>

    <name>demon_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>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.6.0</version>
        </dependency>
        <dependency>
            <groupId>com.xh.dubbo.demon</groupId>
            <artifactId>demon_api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

    <build>
    ...
    </build>
</project>