dubbo入门使用

Posted 2020-11-20 yinz163diudiu

主要参考dubbo官网demo

此处采用zookeeper注册中心进行服务协调管理

真个项目结构如下所示：

dcommon : 主要用于定义服务接口， 为dconsumer，dprovider所依赖

dparent: maven父工程

dconsumer： 服务消费者

dprovider: 服务提供者

首先需要在dconsumer和dprovider工程pom文件中加入相关dubbo及zookeeper客户端依赖：

　　　　　　　　　 <dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>dubbo</artifactId>
		</dependency>
		<!-- 此处zk客户端使用curator（从 2.3.0 版本开始支持可选 curator 实现） 客户端， 也可选择使用zkclient 客户端（从 2.2.0 版本开始缺省为 zkclient 实现） -->
		<dependency>
			<groupId>org.apache.curator</groupId>
			<artifactId>curator-recipes</artifactId>
			<version>2.7.0</version>
		</dependency>
		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-classic</artifactId>
			<version>1.2.3</version>
		</dependency>
		<dependency>
			<groupId>ch.qos.logback</groupId>
			<artifactId>logback-core</artifactId>
			<version>1.2.3</version>
		</dependency>

 

dcommon服务接口定义如下，DemoService.java：

package com.yinz.service;

public interface DemoService {

    String sayHello(String word);
}

 

dprovider服务实现如下，DemoServiceImpl.java：

package com.yinz.service.impl;

import com.yinz.service.DemoService;

public class DemoServiceImpl implements DemoService{

	@Override
	public String sayHello(String word) {
		return "hello : " + word;
	}

}

 

xml配置如下，application.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">
       
<dubbo:application name="demo-provider"/>
	
	<!-- 延迟暴露服务，spring容器初始化成功后再暴露服务，防止当服务器实现类中有 applicationContext.getBean() 的调用时出错，
	强烈建议全部采用 IoC 注入的方式使用 Spring的Bean。-->
	<dubbo:provider delay="-1"/>
	
	<!-- register="false" 禁用注册
	subscribe="false" 禁用订阅 -->
    <dubbo:registry address="zookeeper://47.98.11.199:2181"/>
    
    <!-- 配置dubbo协议线程模型 -->
    <dubbo:protocol name="dubbo" port="20880" accesslog="true"
    dispatcher="message" threadpool="fixed" threads="100"/>
    
    
    <!--cluster="failover" 为默认配置，此处可省略  -->
    <dubbo:service interface="com.yinz.service.DemoService" ref="demoService"
    retries="2" cluster="failover" loadbalance="roundrobin"/>
    <bean id="demoService" class="com.yinz.service.impl.DemoServiceImpl"/>
    
</beans>

 

加载spring配置代码如下：

package com.yinz.provider;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Provider {

	 public static void main(String[] args) throws Exception {
	        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
	                new String[] {"classpath:application.xml"});
	        context.start();
	        // press any key to exit
	        System.in.read();
	    }
}

 

dconsumer，服务消费端配置引用远程服务，application.xml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">
       
<dubbo:application name="demo-consumer"/>
    <dubbo:registry address="zookeeper://47.98.11.199:2181"/>
    <dubbo:protocol name="dubbo" port="20880"/>
    <dubbo:reference  interface="com.yinz.service.DemoService" id="demoService" async="true"/>
</beans>

 

加载spring配置并调用远程服务

package com.yinz.consumer;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.yinz.service.CallbackListener;
import com.yinz.service.CallbackService;
import com.yinz.service.DemoService;

public class Consumer {

	 public static void main(String[] args) throws Exception {
	        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
	                new String[]{"classpath:application.xml"});
	        context.start();
	        // obtain proxy object for remote invocation
	        DemoService demoService = (DemoService) context.getBean("demoService");
	        String hello = demoService.sayHello("world");
	        System.out.println(hello);
	        System.in.read();
	    }
}

 此外dubbo支持容错、负载均衡等高级特性，可参考dubbo官方文档介绍

另外附上dubbo管理控制台官网安装教程