dubbo快速入门demo

参考文章 https://blog.csdn.net/abcwanglinyong/article/details/81906027

该demo包含三个项目,分别是:

服务提供端项目:provider

服务消费端项目:consumer

共用服务接口项目:api

1、新建maven项目api

注意将其pom.xml中的打包方式改为jar

然后在com.dubbo.api.service包下新建DemoService接口,如下:

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

项目结构如图,将api工程打成jar 安装到maven仓库

dubbo快速入门demo

2.dubbo服务提供者provider项目

新建maven项目provider,并在pom.xml中添加以下依赖:

<dependencies>
    <dependency>
        <groupId>com.dubbo.api</groupId>
        <artifactId>api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>dubbo</artifactId>
        <version>2.5.3</version>
    </dependency>

    <dependency>
        <groupId>com.101tec</groupId>
        <artifactId>zkclient</artifactId>
        <version>0.10</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.0.5.RELEASE</version>
    </dependency>
</dependencies>

这里引入了上面的生成的api接口依赖、dubbo依赖、zookeeper客服端依赖以及启动项目必需的依赖

然后在com.dubbo.provider.service.impl包下新建DemoServiceImp并实现DemoService接口,如下:

package com.dubbo.provider.service.impl;

import com.dubbo.service.DemoService;

public class DemoServiceImpl implements DemoService {
    public String sayHello(String name) {
        return "Hello " + name;

    }
}

然后在resources下新建provider.xml文件,配置如下:

<?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">
    <!--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="demo-provider" owner="xxy" organization="dubbox"/>
    <!--使用 zookeeper 注册中心暴露服务,注意要先开启 zookeeper-->
    <dubbo:registry address="zookeeper://192.168.64.123:2181"/>
    <!-- 用dubbo协议在20880端口暴露服务 -->
    <dubbo:protocol name="dubbo" port="20880" />
    <!--使用 dubbo 协议实现定义好的 api.PermissionService 接口-->
    <dubbo:service interface="com.dubbo.service.DemoService" ref="demoService" protocol="dubbo" />
    <!--具体实现该接口的 bean-->
    <bean id="demoService" class="com.dubbo.provider.service.impl.DemoServiceImpl"/>
</beans>

然后在java下直接新建Provider用于启动项目:

package com.dubbo.provider.service.impl;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;

public class Provider {
    public static void main(String[] args) throws IOException {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("provider.xml");
        context.start();
        System.out.println("dubbo服务提供端已启动....");
        System.in.read(); // 按任意键退出
    }
}

provider项目结构如图:

dubbo快速入门demo

然后直接运行该main函数-dubbo服务提供者已启动!

3.dubbo服务消费者consumer项目

新建maven项目consumer,并在pom.xml中添加以下依赖:

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

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

<dependencies>
    <dependency>
        <groupId>com.dubbo.api</groupId>
        <artifactId>api</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.alibaba/dubbo -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>dubbo</artifactId>
        <version>2.5.3</version>
    </dependency>
    <dependency>
        <groupId>com.101tec</groupId>
        <artifactId>zkclient</artifactId>
        <version>0.10</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>4.0.5.RELEASE</version>
    </dependency>
</dependencies>
</project>

和provider项目添加的依赖一样。

然后在resources下新建comsumer.xml,配置服务消费者,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">
    <dubbo:application name="demo-consumer" owner="xxy" organization="dubbox"/>
    <!--向 zookeeper 订阅 provider 的地址,由 zookeeper 定时推送-->
    <dubbo:registry address="zookeeper://192.168.64.123:2181"/>
    <!--使用 dubbo 协议调用定义好的 api.PermissionService 接口-->
    <dubbo:reference id="demoService" interface="com.dubbo.service.DemoService"/>
</beans>

然后在java下新建Consumer.class用于启动该项目,如下:

package com.dubbo.cusumer;

import com.dubbo.service.DemoService;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;


public class Consumer {
    public static void main(String[] args) throws IOException {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext( "cosumer.xml" );
        context.start();
        System.out.println("dubbo服务消费端已启动...");
        DemoService demoService = (DemoService) context.getBean("demoService");
        String hello = demoService.sayHello("world");
        System.out.println(hello);//显示调用结果
        System.in.read(); // 按任意键退出
    }
}

启动该项目,显示调用结果,如图:

dubbo快速入门demo

 到这里就已经完成了dubbo的远程调用。下面介绍下dubbo-admin管理控制台

4、dubbo-admin管理控制台

通过dubbo-admin可以更好的管理dubbo服务。

首先下载dubbo-admin的war包,下载地址:

http://www.java1234.com/a/javabook/javaweb/2018/0224/10496.html
下载完成后,将dubbo-admin-2.6.0.war复制到tomcat的webapps目录下。然后启动tomcat,访问(这里我的tomcat版本是apache-tomcat-7.0.91,8.5的我这边有问题)

修改 dubbo.properties

dubbo.registry.address=zookeeper://192.168.64.123:2181
dubbo.admin.root.password=服务器账号
dubbo.admin.guest.password=服务器密码

http://localhost:8080/dubbo-admin-2.6.0/

也可以将dubbo-admin-2.6.0重命名为dubbo-admin访问的时候直接访问http://localhost:8080/dubbo-admin即可

用户名和密码都是root

登录后就可以通过网页进行管理dubbo服务了,如图:
dubbo快速入门demo

5、最后看一下 zookeeper 的文件结构

[zk: 192.168.64.123:2181(CONNECTED) 27] ls /dubbo
[com.dubbo.service.DemoService]
[zk: 192.168.64.123:2181(CONNECTED) 28]

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