springCloud+dubbo+nacos（服务注册与发现）⼊门案例
1、环境准备
2、项⽬创建
使⽤IDEA创建⼀个Maven项⽬，在创建三个模块，分别为spring-cloud-nacos-api、spring-cloud-nacos-provider、spring-cloud-nacos-consumer，其中spring-cloud-nacos-api是抽取出来的公共接⼝，使⽤mvn install 命令发布到本地仓库后，在另外两个项⽬中添加依赖。spring-cloud-nacos-provider、spring-cloud-nacos-consumer为springBoot项⽬。⽬录结构如下：
在spring-cloud-nacos-sample⽗⼯程中添加⼀下的依赖如下：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="/POM/4.0.0"
xmlns:xsi="/2001/XMLSchema-instance"
xsi:schemaLocation="/POM/4.0.0 /xsd/maven-4.0.0.xsd">
springcloud实例<modelVersion>4.0.0</modelVersion>
<groupId&le</groupId>
<artifactId>spring-cloud-nacos-sample</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>spring-cloud-nacos-api</module>
<module>spring-cloud-nacos-provider</module>
<module>spring-cloud-nacos-consumer</module>
</modules>
<properties>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-dependencies</artifactId>
<version>2.3.9.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>2.2.5.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Hoxton.SR9</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>2.3.9.RELEASE</version>
</dependency>
</dependencies>
</project>
3、api代码编写
在api中定义⼀个接⼝：使⽤mvn install 发布到仓库
public interface IHelloService {
String sayHello(String name);
}
4、编写服务提供者spring-cloud-nacos-provider ⾸先，在l中添加相关依赖如下：（未指定version的已经在⽗⼯程中统⼀管理）
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="/POM/4.0.0"
xmlns:xsi="/2001/XMLSchema-instance"
xsi:schemaLocation="/POM/4.0.0 /xsd/maven-4.0.0.xsd">
<parent>
<artifactId>spring-cloud-nacos-sample</artifactId>
<groupId&le</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-cloud-nacos-provider</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-dubbo</artifactId>
</dependency>
<dependency>
<groupId&le</groupId>
<artifactId>spring-cloud-nacos-api</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
</dependencies>
</project>
然后，编写主启动类和新建⼀个类实现api中的接⼝：
@SpringBootApplication
@DubboComponentScan//会扫描@DubboService发布的远程服务
public class ProviderApplication {
public static void main(String[] args) {
SpringApplication.run(ProviderApplication.class,args);
}
}
1 @DubboService
2public class HelloServiceImpl implements IHelloService {
3public String sayHello(String name) {
4return "hello,"+name;
5 }
6 }
注意：@DubboService作⽤是将该接⼝发布为dubbo服务，在⽼的版本中叫@Service
配置l：
spring:
application:
name: spring-cloud-nacos-sample
cloud:
nacos:
discovery:
#nacos注册中⼼地址
server-addr: 127.0.0.1:8848
dubbo:
protocol:
#使⽤dubbo协议
name: dubbo
#端⼝号建议都设置⼀下
port: 9000
#dubbo主机绑定
host: localhost
registry:
#Dubbo服务注册中⼼的配置地址，值spring-cloud://localhost表⽰挂载到SpringCloud注册中⼼，不配置会提⽰没有配置中⼼的错误 address: spring-cloud://localhost
5、编写服务消费者spring-cloud-nacos-consumer
创建主启动类：
@SpringBootApplication
@DubboComponentScan
public class ConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(ConsumerApplication.class,args);
}
}
添加maven依赖：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="/POM/4.0.0"
xmlns:xsi="/2001/XMLSchema-instance"
xsi:schemaLocation="/POM/4.0.0 /xsd/maven-4.0.0.xsd">
<parent>
<artifactId>spring-cloud-nacos-sample</artifactId>
<groupId&le</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-cloud-nacos-consumer</artifactId>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-dubbo</artifactId>
</dependency>
<dependency>
<groupId&le</groupId>
<artifactId>spring-cloud-nacos-api</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
</dependency>
</dependencies>
</project>
创建⼀个HelloController测试类，定义⼀个接⼝：
@RestController
public class HelloController {
@DubboReference
private IHelloService helloService;
@GetMapping("/say")
public String sayHello(){
return helloService.sayHello("mic");
}
}
配置l：
spring:
application:
name: spring-cloud-nacos-consumer
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
dubbo:
cloud:
#订阅已经注册的服务，（实际为spring-cloud-nacos-provider服务中yml⽂件配置的spring.application.name的值）
subscribed-services: spring-cloud-nacos-sample
server:
port: 9000
最后，在浏览器端输⼊ localhost:9000/say 看到响应 hello,mic 说明操作成功！浏览器访问localhost:8848/nacos后，在服务管理——>服务列表查看响应的服务实例
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