Dubbo入门

官方文档：http://dubbo.apache.org/zh-cn/docs/user/quick-start.html

快速启动

Dubbo 采用全 Spring 配置方式，透明化接入应用，对应用没有任何 API 侵入，只需用 Spring 加载 Dubbo 的配置即可，Dubbo 基于 Spring 的 Schema 扩展进行加载。

如果不想使用 Spring 配置，可以通过 API 的方式进行调用。

依赖

<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.zd</groupId>
    <artifactId>DubboDemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>DubboDemo</name>
    <url>http://maven.apache.org</url>
    <repositories>
        <!-- 阿里云仓库,配置Maven仓库，速度快配置在最前面 -->
        <repository>
            <id>aliyun</id>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
        </repository>
        <!-- 国内备选仓库 -->
        <repository>
            <id>repo2</id>
            <url>http://repo2.maven.org/maven2/</url>
        </repository>
    </repositories>

    <properties>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <!-- spring版本号 -->
        <spring.version>4.2.5.RELEASE</spring.version>

        <!-- log4j日志包版本号 -->
        <slf4j.version>1.7.18</slf4j.version>
        <log4j.version>1.2.17</log4j.version>

    </properties>
    <dependencies>
        <!-- 添加spring核心依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</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-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- spring 结束 -->

        <!-- 添加日志相关jar包 -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <!-- log end -->


        <!-- zeekeeper注册中心 -->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>3.4.9</version>
        </dependency>
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.10</version>
        </dependency>


        <!-- dubbo -->
        <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>

    </dependencies>
</project>

View Code

服务提供者

完整安装步骤，请参见：示例提供者安装

定义服务接口

DemoService.java ^[1]：

package org.apache.dubbo.demo;

public interface DemoService {
    String sayHello(String name);
}

在服务提供方实现接口

DemoServiceImpl.java ^[2]：

package org.apache.dubbo.demo.provider;
 
import org.apache.dubbo.demo.DemoService;
 
public class DemoServiceImpl implements DemoService {
    public String sayHello(String name) {
        return "Hello " + name;
    }
}

用 Spring 配置声明暴露服务

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">

    <!--定义了提供方应用信息，用于计算依赖关系；在 dubbo-admin 或 dubbo-monitor 会显示这个名字，方便辨识 -->
    <dubbo:application name="hello-world-app" />
    
    <!--使用 zookeeper 注册中心暴露服务，注意要先开启 zookeeper -->
    <dubbo:registry address="zookeeper://192.168.1.252:2181" />
    
    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" host="192.168.1.252" />
    
    <!--使用 dubbo 协议实现定义好的 api.PermissionService 接口 -->
    <dubbo:service interface="com.zd.DubboDemo.DemoService" ref="demoService" protocol="dubbo" />
        
    <!--具体实现该接口的 bean -->
    <bean id="demoService" class="com.zd.DubboDemo.DemoServiceImpl" />
</beans>

加载 Spring 配置

Provider.java：

import org.springframework.context.support.ClassPathXmlApplicationContext;
 
public class Provider {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"provider.xml"});
        context.start();
        System.in.read(); // 按任意键退出
    }
}

服务消费者

完整安装步骤，请参见：示例消费者安装

通过 Spring 配置引用远程服务

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">

    <!--定义了提供方应用信息，用于计算依赖关系；在 dubbo-admin 或 dubbo-monitor 会显示这个名字，方便辨识 -->
    <dubbo:application name="consumer-of-helloworld-app" />

    <!--使用 zookeeper 注册中心暴露服务，注意要先开启 zookeeper -->
    <dubbo:registry address="zookeeper://192.168.1.252:2181" />

    <!--使用 dubbo 协议调用定义好的 api.PermissionService 接口 -->
    <dubbo:reference id="providerService" interface="com.zd.DubboDemo2.DemoService" url="dubbo://192.168.1.252:20880/com.zd.DubboDemo.DemoService" />
        
</beans>

加载Spring配置，并调用远程服务

Consumer.java ^[3]：

import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.apache.dubbo.demo.DemoService;
 
public class Consumer {
    public static void main(String[] args) throws Exception {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"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
    }
}

posted @ 2019-12-20 17:50 逐梦客！阅读(96) 评论(0) 收藏举报

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