springcloud中使用dubbo开发rpc服务及调用

spring cloud中基于springboot开发的微服务，是基于http的rest接口，也可以开发基于dubbo的rpc接口。

一，创建goodsService模块

　　1， 在创建的goodsService模块中再创建goodsServiceApi和goodsServiceServer模块

　　2，在oodsServiceApi模块中定义接口 ，goodsServiceServer用于接口实现

　　3，goodsServiceServer模块中pom文件引入相关依赖

<dependencies>
        <dependency>
            <groupId>net.biui</groupId>
            <artifactId>goods-service-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-dubbo</artifactId>
        </dependency>
    </dependencies>

　　4，goodsServiceServer中添加配置

spring:
  application:
    name: goods-service
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        namespace: c22e5019-0bee-43b1-b80b-fc0b9d847501

dubbo:
  registry:
    address: nacos://127.0.0.1:8848
  scan:
    base-packages: net.biui.impl
  protocol:
    port: 20881
    name: dubbo

　　5，goodsServiceServer编写接口实现

@org.apache.dubbo.config.annotation.Service
public class GoodsImpl implements GoodsApi {
    public String getGoodsName() {
        return "商品一";
    }
}

　　6，goodsServiceServer编写启动类

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

启动后，dubbo服务会自动注册到nacos服务发现中心

二，创建调用dubbo服务的模块

　　1，new -> module -> 填写信息 -> finish

　　2，添加pom依赖

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-dubbo</artifactId>
        </dependency>
        <dependency>
            <groupId>net.biui</groupId>
            <artifactId>goods-service-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

　　3，添加配置

spring:
  application:
    name: demo-dubbo
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
        namespace: c22e5019-0bee-43b1-b80b-fc0b9d847501

　　4，编写controller调用dubbo服务

@RestController
@RequestMapping("/demo")
public class demoController {

    @org.apache.dubbo.config.annotation.Reference
    GoodsApi goodsApi;

    @GetMapping("/test")
    public String test(){
        return "test " + goodsApi.getGoodsName();
    }
}

　　5，编写启动类

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

启动后，demo-dubbo服务也会自动注册到nacos（因为nacos.register.enable默认为true，即代表自动注册，可以只订阅，不注册），对应接口返回了dubbo服务返回的信息！