知识点说明：

nacos官网地址：https://nacos.io/zh-cn/

nacos-server下载地址：https://github.com/alibaba/nacos/releases

dubbo官网地址：https://dubbo.apache.org/zh/docs/v2.7/user/references/

目录

1、父工程

1.1、项目结构

1.2 、父工程POM

2、基础工程

2.1、基础项目图

2.2、服务层TProductService代码

2.3、POM文件

3、子工程商品服务

3.1、商品服务POM

3.2、商品服务项目图

3.3、商品服务配置

4、子工程订单服务

4.1、 订单服务POM

4.2、订单服务项目图

4.3、订单服务配置

5、项目启动

5.1、登录nacos管理界面查看服务是否注册

5.2、访问 http://localhost:10092/api/order/get

6、注意事项

6.1、依赖版本问题

---

 

1、父工程

1.1、项目结构

1.2 、父工程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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.7.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.bean.spring_cloud_alibaba</groupId>
    <artifactId>spring_cloud_alibaba</artifactId>
    <version>1.0.0</version>
    <name>spring_cloud_alibaba</name>
    <description>自己的SpringCloud电商项目</description>
    <packaging>pom</packaging>


    <modules>
        <module>common</module>
        <module>account</module>
        <module>order</module>
        <module>order_delivery</module>
        <module>product</module>
        <module>product_stock</module>
    </modules>


    <properties>
        <java.version>1.8</java.version>
        <spring.boot.dependencies.version>2.1.7.RELEASE</spring.boot.dependencies.version>
        <mybatis.spring.boot.starter.version>2.0.1</mybatis.spring.boot.starter.version>
        <mysql.connector.java.version>5.1.47</mysql.connector.java.version>
        <fastjson.version>1.2.67</fastjson.version>
        <guava.version>18.0</guava.version>
        <druid.spring.boot.starter.version>1.1.16</druid.spring.boot.starter.version>
        <spring-cloud-alibaba.version>2.1.0.RELEASE</spring-cloud-alibaba.version>
        <spring-cloud.version>Greenwich.SR3</spring-cloud.version>
    </properties>


    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient -->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.3</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>
        <!--<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>${druid.spring.boot.starter.version}</version>
        </dependency>-->
        <!-- https://mvnrepository.com/artifact/com.google.guava/guava -->
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>18.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <!-- 模块说明：这里声明多个子模块 -->
        <dependencies>
             <dependency>
                 <groupId>com.alibaba.cloud</groupId>
                 <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                 <version>2.1.0.RELEASE</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-dependencies -->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.dependencies.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--子版本依赖-->
            <dependency>
                <groupId>com.bean.spring_cloud_alibaba</groupId>
                <artifactId>common</artifactId>
                <version>1.0.0</version>
            </dependency>
            <!--子版本依赖-->
            <dependency>
                <groupId>com.bean.spring_cloud_alibaba</groupId>
                <artifactId>account</artifactId>
                <version>1.0.0</version>
            </dependency>
            <!--子版本依赖-->
            <dependency>
                <groupId>com.bean.spring_cloud_alibaba</groupId>
                <artifactId>order</artifactId>
                <version>1.0.0</version>
            </dependency>
            <!--子版本依赖-->
            <dependency>
                <groupId>com.bean.spring_cloud_alibaba</groupId>
                <artifactId>order_delivery</artifactId>
                <version>1.0.0</version>
            </dependency>
            <!--子版本依赖-->
            <dependency>
                <groupId>com.bean.spring_cloud_alibaba</groupId>
                <artifactId>product</artifactId>
                <version>1.0.0</version>
            </dependency>
            <!--子版本依赖-->
            <dependency>
                <groupId>com.bean.spring_cloud_alibaba</groupId>
                <artifactId>product_stock</artifactId>
                <version>1.0.0</version>
            </dependency>
        </dependencies>
    </dependencyManagement>

</project>

2、基础工程

2.1、基础项目图

2.2、服务层TProductService代码

/**
* @Description //TODO
* @Date 2020/10/22 1:17
* @Author huangwb
**/
public interface ITProductService {
    /**
     * @return java.lang.String
     * @Author huangwb
     * @Description //TODO 获取商品名称测试
     * @Date  2020/10/22 22:29
     * @Param []
     *
     **/
    String getProductName();
}

2.3、POM文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.bean.spring_cloud_alibaba</groupId>
        <artifactId>spring_cloud_alibaba</artifactId>
        <version>1.0.0</version>
        <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
    </parent>
    <artifactId>common</artifactId>
    <version>1.0.0</version>
    <name>common</name>
    <description>基础项目</description>
    <packaging>jar</packaging>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>


</project>

3、子工程商品服务

3.1、商品服务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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.bean.spring_cloud_alibaba</groupId>
        <artifactId>spring_cloud_alibaba</artifactId>
        <version>1.0.0</version>
        <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
    </parent>
    <artifactId>product</artifactId>
    <version>1.0.0</version>
    <name>product</name>
    <description>商品服务</description>
    <packaging>jar</packaging>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <profiles>
        <profile>
            <id>dev</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <properties>
                <profileActive>dev</profileActive>
            </properties>
        </profile>
        <profile>
            <id>test</id>
            <properties>
                <profileActive>test</profileActive>
            </properties>
        </profile>
        <profile>
            <id>prod</id>
            <properties>
                <profileActive>prod</profileActive>
            </properties>
        </profile>
    </profiles>
    <dependencies>
        <dependency>
            <groupId>com.bean.spring_cloud_alibaba</groupId>
            <artifactId>common</artifactId>
            <version>1.0.0</version>
        </dependency>
        <!-- 服务注册发现-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!-- 使用配置中心的方式-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <!--整合dubbo-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-dubbo</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.spring</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>1.0.2</version>
        </dependency>
    </dependencies>


    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
                <excludes>
                    <exclude>bootstrap-dev.yml</exclude>
                    <exclude>bootstrap-prod.yml</exclude>
                    <exclude>bootstrap-test.yml</exclude>-->
                    <exclude>bootstrap.yml</exclude>
                </excludes>
            </resource>
            <resource>
                <filtering>true</filtering>
                <directory>src/main/resources</directory>
                <includes>
                    <include>bootstrap-${profileActive}.yml</include>
                    <include>bootstrap.yml</include>
                </includes>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.18.1</version>
                <configuration>
                    <skipTests>true</skipTests>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <repositories><!-- 代码库 -->
        <repository>
            <id>maven-ali</id>
            <url>http://maven.aliyun.com/nexus/content/groups/public//</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
                <updatePolicy>always</updatePolicy>
                <checksumPolicy>fail</checksumPolicy>
            </snapshots>
        </repository>
    </repositories>


</project>

3.2、商品服务项目图

3.3、商品服务配置

bootstrap.yml

spring:
  profiles:
    active: @profileActive@
  application:
    name: spring-cloud-alibaba-product #商品服务
server:
  port: 10091

bootstrap-dev.yml

nacos:
  group: PRODUCT_GROUP #nacos组信息
spring:
  cloud:
    nacos:
      config:
        #nacos注册中心
        server-addr: ip:8848
        #file-extension: yaml
        #通过nacos命名空间进行隔离
        namespace: 6058d723-26ee-4619-8415-9fd23b0046b8
        #配置多个配置文件直接引入
        extension-configs:
          - data-id: application.yml
            refresh: true
            group: ${nacos.group}
      discovery:
        #nacos注册中心
        server-addr: ip:8848
        #通过nacos命名空间进行隔离
        namespace: 6058d723-26ee-4619-8415-9fd23b0046b8
dubbo:
  scan:
    base-packages: com.bean.spring_cloud_alibaba.service #dubbo 的api实现类扫描包（默认扫描包会自动添加进Spring的依赖中 因为Dubbo会使用componentScan）
  protocol:
    name: dubbo #通信协议：dubbo
    port: -1 #dubbo通信端口
  registry:
    address: nacos://ip:8848 #注册中心地址，使用springcloud的注册中心
    # 配置namespace隔离
    parameters[namespace]: 6058d723-26ee-4619-8415-9fd23b0046b8

TProductController

import com.bean.spring_cloud_alibaba.service.ITProductService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


/**
* @Description //TODO 商品服务控制器测试
* @Date 2020/10/21 23:55
* @Author huangwb
**/
@RestController
@RefreshScope  //刷新配置
@RequestMapping("/api/product")
public class TProductController {
    @Autowired
    private ITProductService itProductService;


    @GetMapping("getProductName")
    public String getProductName() {
        return itProductService.getProductName();
    }
}
TProductServiceImpl
import com.bean.spring_cloud_alibaba.service.ITProductService;
import org.apache.dubbo.config.annotation.Service;


/**
* @Description //TODO
* @Date 2020/10/21 23:54
* @Author huangwb
**/
@Service(version = "1.0.0")
public class TProductServiceImpl implements ITProductService {
    @Override
    public String getProductName() {
        return "获取到商品名1称";
    }
}

4、子工程订单服务

4.1、 订单服务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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.bean.spring_cloud_alibaba</groupId>
        <artifactId>spring_cloud_alibaba</artifactId>
        <version>1.0.0</version>
        <relativePath>../pom.xml</relativePath> <!-- lookup parent from repository -->
    </parent>
    <artifactId>order</artifactId>
    <version>1.0.0</version>
    <name>order</name>
    <description>订单</description>
    <packaging>jar</packaging>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <profiles>
        <profile>
            <id>dev</id>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
            <properties>
                <profileActive>dev</profileActive>
            </properties>
        </profile>
        <profile>
            <id>test</id>
            <properties>
                <profileActive>test</profileActive>
            </properties>
        </profile>
        <profile>
            <id>prod</id>
            <properties>
                <profileActive>prod</profileActive>
            </properties>
        </profile>
    </profiles>
    <dependencies>
        <dependency>
            <groupId>com.bean.spring_cloud_alibaba</groupId>
            <artifactId>common</artifactId>
            <version>1.0.0</version>
        </dependency>
        <!-- 服务注册发现-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <!-- 使用配置中心的方式-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
        <!--整合dubbo-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-dubbo</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.spring</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>1.0.2</version>
        </dependency>
    </dependencies>


    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
                <excludes>
                    <exclude>bootstrap-dev.yml</exclude>
                    <exclude>bootstrap-prod.yml</exclude>
                    <exclude>bootstrap-test.yml</exclude>-->
                    <exclude>bootstrap.yml</exclude>
                </excludes>
            </resource>
            <resource>
                <filtering>true</filtering>
                <directory>src/main/resources</directory>
                <includes>
                    <include>bootstrap-${profileActive}.yml</include>
                    <include>bootstrap.yml</include>
                </includes>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-surefire-plugin</artifactId>
                <version>2.18.1</version>
                <configuration>
                    <skipTests>true</skipTests>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <repositories><!-- 代码库 -->
        <repository>
            <id>maven-ali</id>
            <url>http://maven.aliyun.com/nexus/content/groups/public//</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
                <updatePolicy>always</updatePolicy>
                <checksumPolicy>fail</checksumPolicy>
            </snapshots>
        </repository>
    </repositories>


</project>

4.2、订单服务项目图

4.3、订单服务配置

bootstrap.yml

spring:
  profiles:
    active: @profileActive@
  application:
    name: spring-cloud-alibaba-order #订单服务名称
server:
  port: 10092

bootstrap-dev.yml

nacos:
  group: ORDER_GROUP #nacos组信息
spring:
  cloud:
    nacos:
      config:
        #nacos注册中心
        server-addr: ip:8848
        #file-extension: yaml
        #通过nacos命名空间进行隔离
        namespace: 6058d723-26ee-4619-8415-9fd23b0046b8
        #配置多个配置文件直接引入
        extension-configs:
          - data-id: application.yml
            refresh: true
            group: ${nacos.group}
      discovery:
        #nacos注册中心
        server-addr: ip:8848
        #通过nacos命名空间进行隔离
        namespace: 6058d723-26ee-4619-8415-9fd23b0046b8
dubbo:
  scan:
    base-packages: com.bean.spring_cloud_alibaba.service #dubbo 的api实现类扫描包（默认扫描包会自动添加进Spring的依赖中 因为Dubbo会使用componentScan）
  protocol:
    name: dubbo #通信协议：dubbo
    port: -1 #dubbo通信端口
  registry:
    address: nacos://ip:8848 #注册中心地址，使用springcloud的注册中心
    # 配置namespace隔离
    parameters[namespace]: 6058d723-26ee-4619-8415-9fd23b0046b8

TOrderController

import com.bean.spring_cloud_alibaba.service.ITProductService;
import org.apache.dubbo.config.annotation.Reference;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


/**
* @Description //TODO
* @Date 2020/10/22 1:15
* @Author huangwb
**/
@RestController
@RequestMapping("/api/order")
public class TOrderController {
    @Reference(version = "1.0.0")
    public ITProductService itProductService;


    @GetMapping("/get")
    public String get() {
        return itProductService.getProductName();
    }
}

OrderApplication

import org.apache.dubbo.config.spring.context.annotation.EnableDubbo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;




@SpringBootApplication
@EnableDiscoveryClient
@EnableDubbo
public class OrderApplication {
    public static void main(String[] args) {
        SpringApplication.run(OrderApplication.class, args);
    }
}

5、项目启动

5.1、登录nacos管理界面查看服务是否注册

5.2、访问 http://localhost:10092/api/order/get

6、注意事项

6.1、依赖版本问题

注册SpringCloudAlibaba和Dubbo的依赖版本，否则版本过高或者相差过高，会导致一系列的问题。 我试过其他版本的使用方式，会存在项目启动时候提示找不到对应的Class的Jar包，所以大家根据自己使用版本进行调整版本依赖，有时候不是你配置有问题或者代码有问题，是因为依赖的版本导致的。

<spring-cloud.version>Greenwich.SR3</spring-cloud.version>
<dependency>
     <groupId>com.alibaba.cloud</groupId>
     <artifactId>spring-cloud-alibaba-dependencies</artifactId>
     <version>2.1.0.RELEASE</version>
     <type>pom</type>
     <scope>import</scope>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-dependencies</artifactId>
    <version>${spring-cloud.version}</version>
    <type>pom</type>
    <scope>import</scope>
</dependency>

附带上阿里官方推荐版本图