入門案例之前我們先介紹一下：zookeeper。

Zookeeper是Apacahe Hadoop的子項目，可以為分布式應(yīng)用程序協(xié)調(diào)服務(wù)，適合作為Dubbo服務(wù)的注冊中心，負責(zé)服務(wù)地址的注冊與查找，相當(dāng)于目錄服務(wù)，服務(wù)提供者和消費者只在啟動時與注冊中心交互。

就不用安裝了，我會上傳一個安裝包。

總結(jié)：

????????1、什么是zookeeper？
?? ??? ?????????zookeeper：負責(zé)管理ip和port，是服務(wù)提供者和服務(wù)消費者的注冊中心
?? ???? 2、zookeeper的安裝和啟動
?? ??? ?????????安裝：
?? ??? ?????????? ?解壓即安裝
?? ??????????? ?啟動：
?? ??????????? ??? ?雙擊bin/zkServer.cmd

開始入門案例：（項目結(jié)構(gòu)）

父工程的pom.xml

 <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.3.2.RELEASE</version></parent>
<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- Dubbo Spring Boot Starter --><dependency><groupId>com.alibaba.boot</groupId><artifactId>dubbo-spring-boot-starter</artifactId><version>0.1.0</version></dependency><!-- 由于使?了zookeeper作為注冊中?，則需要加?zookeeper的客戶端jar包： --><dependency><groupId>com.101tec</groupId><artifactId>zkclient</artifactId><version>0.10</version></dependency></dependencies>

1、dobbo_interface模塊

這個模塊中我們就只寫一個接口模擬一下就可以.

在com.by.service中寫一個HelloService接口

/** Copyright (c) 2020, 2024,  All rights reserved.**/
package com.by.service;/*** <p>Project: dubbo_parent - HelloService</p>* <p>Powered by scl On 2024-01-17 13:56:01</p>* <p>描述：<p>** @author 孫臣龍 [1846080280@qq.com]* @version 1.0* @since 17*/
public interface HelloService {String hello();
}

2、dobbo_provider模塊

在這個模塊中我們需要做：實現(xiàn)上個模塊的接口，創(chuàng)建spring boot的啟動類，創(chuàng)建配置類

pom.xml:

<dependencies><dependency><groupId>com.by</groupId><artifactId>dubbo_interface</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies>

HelloServiceImpl：（注意這個@Service注解是dubbo下的）

/** Copyright (c) 2020, 2024,  All rights reserved.**/
package com.by.service;import com.alibaba.dubbo.config.annotation.Service;/*** <p>Project: dubbo_parent - HelloServiceImpl</p>* <p>Powered by scl On 2024-01-17 13:57:42</p>* <p>描述：<p>** @author 孫臣龍 [1846080280@qq.com]* @version 1.0* @since 17*/
@Service
public class HelloServiceImpl implements HelloService{@Overridepublic String hello() {return "你好啊！！！";}
}

啟動類：DubboProviderApp：

/** Copyright (c) 2020, 2024,  All rights reserved.**/
package com.by;import com.alibaba.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;/*** <p>Project: dubbo_parent - DubboProviderApp</p>* <p>Powered by scl On 2024-01-17 13:59:35</p>* <p>描述：<p>** @author 孫臣龍 [1846080280@qq.com]* @version 1.0* @since 17*/
@SpringBootApplication
@EnableDubbo //讓dubbo去掃描dubbo的注解
public class DubboProviderApp {public static void main(String[] args) {SpringApplication.run(DubboProviderApp.class,args);}
}

application.properties:

#zookeeper\u7684\u5730\u5740
dubbo.registry.address=zookeeper://127.0.0.1:2181
#\u901A\u8BAF\u534F\u8BAE\uFF1Armi\u3001http\u3001dubbo
dubbo.protocol.name=dubbo
#\u5F53\u524D\u670D\u52A1\u7684\u540D\u79F0
dubbo.application.name=dubbo-provider

3、dobbo_consumer模塊

在這個模塊中我們需要測試一下我們的功能。實現(xiàn)上個模塊的接口，創(chuàng)建spring boot的啟動類，創(chuàng)建配置類。

pom.xml:

<dependencies><dependency><groupId>com.by</groupId><artifactId>dubbo_interface</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies>

HelloController:(注意：@Reference也是dubbo下的)

/** Copyright (c) 2020, 2024,  All rights reserved.**/
package com.by.controller;import com.alibaba.dubbo.config.annotation.Reference;
import com.by.service.HelloService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
/*** <p>Project: dubbo_parent - HelloController</p>* <p>Powered by scl On 2024-01-17 15:02:44</p>* <p>描述：<p>** @author 孫臣龍 [1846080280@qq.com]* @version 1.0* @since 17*/
@Controller
public class HelloController {@Referenceprivate HelloService helloService;@RequestMapping("/hello")@ResponseBodypublic String hello(){return helloService.hello();}
}

啟動類：DubboConsumerApplication：

/** Copyright (c) 2020, 2024,  All rights reserved.**/
package com.by;import com.alibaba.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;/*** <p>Project: dubbo_parent - DubboConsumerApplication</p>* <p>Powered by scl On 2024-01-17 15:00:04</p>* <p>描述：<p>** @author 孫臣龍 [1846080280@qq.com]* @version 1.0* @since 17*/
@SpringBootApplication
@EnableDubbo
public class DubboConsumerApplication {public static void main(String[] args) {SpringApplication.run(DubboConsumerApplication.class,args);}
}

配置文件：application.porperties

#zookeeper\u7684\u5730\u5740
dubbo.registry.address=zookeeper://127.0.0.1:2181
#\u901A\u8BAF\u534F\u8BAE\uFF1Armi\u3001http\u3001dubbo
dubbo.protocol.name=dubbo
#\u5F53\u524D\u670D\u52A1\u7684\u540D\u79F0
dubbo.application.name=dubbo-consumer
server.port=80

注意：
?? ??? ?1、zookeeper必須啟動
?? ??? ?2、 @Reference 和 @Service必須到dubbo的包
?? ??? ?3、必須先啟動provider再起consumer

??????? 4、模塊provider和consumer的端口號要區(qū)分開

結(jié)果展示：