springboot+dubbo + zookeeper 案例

配置:
dubbo.application.name=function-two
#注册中心的协议和地址
dubbo.registry.protocol=zookeeper
dubbo.registry.address=127.0.0.1:2181
#通信规则（通信协议和接口）
dubbo.protocol.name=dubbo
dubbo.protocol.port=20881
#连接监控中心
dubbo.monitor.protocol=registry

实现类: 生产者

import com.alibaba.dubbo.config.annotation.Service;
import com.sc.fun.service.WorldService;
import lombok.extern.log4j.Log4j2;

/**
 * @author Administrator
 * @description: TODO
 * @date 2021/7/20 13:46
 */
@Service(interfaceClass = WorldService.class)
@Log4j2
public class WorldServiceImpl implements WorldService {

    @Override
    public String sayWorld() {
        log.info("world");
        return "world";
    }
}

实现类:消费者

import com.alibaba.dubbo.config.annotation.Reference;
import com.sc.fun.service.HelloService;
import com.sc.fun.service.SCApiService;
import com.sc.fun.service.WorldService;
import org.springframework.stereotype.Service;

/**
 * @author Administrator
 * @description: TODO
 * @date 2021/7/21 16:18
 */
@Service
public class SCApiServiceImpl implements SCApiService {

    @Reference
    private HelloService helloService;

    @Reference
    private WorldService worldService;

    @Override
    public String sayHelloWorld() {
        String h = helloService.sayHello();
        String w = worldService.sayWorld();
        return "i say : " + h + w;
    }
}

jar坐标

<?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.sc</groupId>
    <artifactId>demo</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>common</module>
        <module>function-one</module>
        <module>function-two</module>
        <module>function-api</module>
        <module>function-gateway</module>
    </modules>

    <!-- 本项目的父模块使用spring-boot框架 -->
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
    </parent>

    <!-- 项目自定义属性 -->
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <!-- 依赖的版本号：在定义版本时，要注意的是不同的依赖版本之间会有影响，有些最新的版本不支持其他依赖的低版本一起使用-->
        <mysql.driver.version>5.1.29</mysql.driver.version>
        <org.mybatis.spring.boot.version>1.3.1</org.mybatis.spring.boot.version>
        <alibaba.druid.version>1.1.9</alibaba.druid.version>
        <spring.cloud.version>Finchley.SR1</spring.cloud.version>
        <dubbo.version>2.6.2</dubbo.version>
        <dubbo.start.version>0.2.0</dubbo.start.version>
        <curator.version>4.0.1</curator.version>
        <zookeeper.version>3.4.13</zookeeper.version>
        <curator.recipes.version>2.8.0</curator.recipes.version>
        <zkclient.version>0.10</zkclient.version>
    </properties>

    <!-- 项目依赖项 -->
    <dependencyManagement>    <!-- dependencyManagement只是声明依赖，并不实现引入 -->
        <dependencies>
            <!-- Spring Cloud -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring.cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <!-- Spring Boot -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
      <!--  <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- 添加junit4依赖 单元测试-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!-- 切面 -->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.8</version>
        </dependency>
        <!-- 简化Entity代码（实体类添加@Data，编译时为所有字段添加@ToString/@EqualsAndHashCode/@Getter/为非final字段添加@Setter） -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.20</version>
        </dependency>
        <!-- 添加mybatis依赖-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>${org.mybatis.spring.boot.version}</version>
        </dependency>
        <!-- 添加mysql驱动依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
            <version>${mysql.driver.version}</version>
        </dependency>
        <!-- 添加数据库连接池依赖 -->
         <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>${alibaba.druid.version}</version>
        </dependency>
        <!--zk客户端-->
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-framework</artifactId>
            <version>${curator.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.curator</groupId>
            <artifactId>curator-recipes</artifactId>
            <version>${curator.recipes.version}</version>
        </dependency>
        <!--zk服务端-->
        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <version>${zookeeper.version}</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>${zkclient.version}</version>
        </dependency>
        <!--dubbo-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>${dubbo.version}</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.boot</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
            <version>${dubbo.start.version}</version>
        </dependency>
    </dependencies>
    <!-- <scope>主要管理依赖的部署
       * compile，缺省值，适用于所有阶段，会随着项目一起发布。
       * provided，类似compile，期望JDK、容器或使用者会提供这个依赖。如servlet.jar。
       * runtime，只在运行时使用，如JDBC驱动，适用运行和测试阶段。
       * test，只在测试时使用，用于编译和运行测试代码。不会随项目发布。
       * system，类似provided，需要显式提供包含依赖的jar，Maven不会在Repository中查找它。
    -->

    <build>
        <plugins>
            <!--打包跳过测试-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <configuration>
                    <skip>true</skip>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

备注:
每个业务微服务都是生产者，增加一个统一消费的微服务【该服务是需要引用生产者的微服务jar包】,请求直接走消费微服务的api
假如两个或以上业务微服务既是生产者又是消费者的情况下,相互引用.这种情况是不允许的【禁止模块直接互相引用】
每个微服务端口不一样,dubbo端口也不一样