0、docker 启动 zk

docker-compose.yml

version: '3'services:  zoo1:    image: zookeeper    restart: always    hostname: zoo1    ports:      - 2181:2181
docker-compose up -d

1、创立父 pom

<?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.csp</groupId>    <artifactId>dubbo-exam</artifactId>    <packaging>pom</packaging>    <version>1.0-SNAPSHOT</version>    <modules>        <module>dubbo-api</module>        <module>dubbo-provider</module>        <module>dubbo-consumer</module>    </modules>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>2.1.7.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.apache.dubbo</groupId>            <artifactId>dubbo-spring-boot-starter</artifactId>            <version>2.7.7</version>            <exclusions>                <exclusion>                    <groupId>org.slf4j</groupId>                    <artifactId>slf4j-log4j12</artifactId>                </exclusion>            </exclusions>        </dependency>        <dependency>            <groupId>org.apache.dubbo</groupId>            <artifactId>dubbo</artifactId>            <version>2.7.7</version>        </dependency>        <dependency>            <groupId>org.apache.curator</groupId>            <artifactId>curator-framework</artifactId>            <version>4.0.1</version>        </dependency>        <dependency>            <groupId>org.apache.curator</groupId>            <artifactId>curator-recipes</artifactId>            <version>2.8.0</version>        </dependency>        <dependency>            <groupId>org.apache.zookeeper</groupId>            <artifactId>zookeeper</artifactId>            <version>3.4.13</version>            <type>pom</type>            <exclusions>                <exclusion>                    <groupId>org.slf4j</groupId>                    <artifactId>slf4j-log4j12</artifactId>                </exclusion>            </exclusions>        </dependency>        <dependency>            <groupId>com.101tec</groupId>            <artifactId>zkclient</artifactId>            <version>0.10</version>        </dependency>    </dependencies></project>

2、创立 api maven 工程

package com.csp.dubbo.demo;public interface TestApiService {    String sayHello(String name);}

3、创立服务提供者

Application

package com.csp.dubbo.demo.provider;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class Application {    public static void main(String[] args) {        SpringApplication.run(Application.class);    }}

TestApiServiceImpl

package com.csp.dubbo.demo.provider.impl;import com.csp.dubbo.demo.TestApiService;import org.apache.dubbo.config.annotation.DubboService;@DubboService(version = "1.0.0", interfaceClass = TestApiService.class)public class TestApiServiceImpl implements TestApiService {    @Override    public String sayHello(String name) {        System.out.println("我是 provider， 我被调用了");        return name + " say hello";    }}

application.properties

#spring我的项目名spring.application.name=dubbo_auto_configuration_provider_demo#Dubbo provider configurationdubbo.application.name=dubbo_providerdubbo.registry.protocol=zookeeperdubbo.registry.address=zookeeper://127.0.0.1:2181dubbo.protocol.name=dubbodubbo.protocol.port=20880#扫描注解包通过该设置将服务注册到zookeeperdubbo.scan.base-packages=com.csp.dubbo.demo.provider

4、创立消费者

Application

package com.csp.dubbo.demo.consumer;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class Application {    public static void main(String[] args) {        SpringApplication.run(Application.class);    }}

TestController

package com.csp.dubbo.demo.consumer.controller;import com.csp.dubbo.demo.Test2Service;import com.csp.dubbo.demo.TestApiService;import org.apache.dubbo.config.annotation.DubboReference;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class TestController {    @DubboReference(version = "1.0.0")    TestApiService testApiService;    @GetMapping("/sayHello")    public Object sayHello(String name) {        String hello = testApiService.sayHello(name);        return hello;    }}

application.properties

#spring我的项目名spring.application.name=dubbo_auto_configuration_consumer_demo#Dubbo provider configurationdubbo.application.name=dubbo_consumerdubbo.registry.protocol=zookeeperdubbo.registry.address=zookeeper://127.0.0.1:2181server.port=8082

5、总结

  1. provider 和 consumer 必须实现同一个接口。
  2. consumer 设置的 version 也要和 provider 写的 version 统一。
  3. 实际上，provider 是不须要启动 web 容器的！