【转载请注明出处】：https://juejin.cn/post/6844904186769833997

公司以前的系统都是基于Dubbo的分布式架构，后来的新业务逐渐采用了SpringCloud微服务架构，在相互的业务调用中都是提供http接口供各自调用，但是总感觉很别扭，现在有了阿里开源的Nacos就可以解决很多问题。最终要实现的效果就是同一个接口，既可以用Dubbo的方式调用，也可以用Feign来调用，覆盖当前的这种场景。

此时服务提供者即注册了 Dubbo 又注册了 Http 服务，服务消费者根据配置方式可以在 Dubbo 与 Http 调用中随意切换。

1、接口`nacos-dubbo-cloud-provider-api`

接口API做为服务提供者和消费者的共同依赖，将接口不仅暴露为RestAPI，做为Feign的客户端，也按照Dubbo协议注册。依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>

接口

@FeignClient("nacos-dubbo-cloud-provider-service")
public interface EchoRestDubboService {

    @GetMapping("/echoRestDubbo")
    String echo(@RequestParam String name);
}

nacos-dubbo-cloud-provider-service是服务提供者的应用名。

2、服务提供者`nacos-dubbo-cloud-provider-service`

依赖

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>com.eyison</groupId>
    <artifactId>nacos-dubbo-cloud-provider-api</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId
    <version>0.9.0.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-dubbo</artifactId>
    <version>0.9.0.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-security</artifactId>
 </dependency>

EchoRestDubboService的实现类

@RestController
@Service(version = "1.0.0", protocol = {"dubbo"})
public class EchoRestDubboServiceImpl implements EchoRestDubboService {

    private final Logger logger = LoggerFactory.getLogger(EchoRestDubboServiceImpl.class);

    @Override
    public String echo(String name) {

        logger.info("echo rest dubbo :{}", name);
        return "hello " + name;
    }
}

WebSecurity配置这个必须得配置，否则Dubbo启动的时候会报EndPoint的错。

@EnableWebSecurity
class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    public void configure(WebSecurity web) throws Exception {
        web.ignoring().antMatchers("/**");
        super.configure(web);
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {

        http.authorizeRequests()
                .requestMatchers(EndpointRequest.to("health", "info")).permitAll();
        super.configure(http);
    }
}

启动类NacosDubboCloudProviderApplication

@SpringBootApplication
@EnableDiscoveryClient
public class NacosDubboCloudProviderApplication {

    public static void main(String[] args) {
        SpringApplication.run(NacosDubboCloudProviderApplication.class, args);
    }
}

配置

server:
  port: 8021
spring:
  application:
    name: nacos-dubbo-cloud-provider-service
  main:
      allow-bean-definition-overriding: true
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
dubbo:
  scan:
    base-packages: com.eyison.service
  protocols:
    dubbo:
      name: dubbo
      port: -1
  registry:
    address: spring-cloud://localhost
feign:
  hystrix:
    enabled: true

3、服务消费者`nacos-dubbo-cloud-consumer`

依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
    <groupId>com.eyison</groupId>
    <artifactId>nacos-dubbo-cloud-provider-api</artifactId>
    <version>1.0-SNAPSHOT</version>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
    <version>0.9.0.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-dubbo</artifactId>
    <version>0.9.0.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-security</artifactId>
</dependency>

WebSecurity配置类同上，这里不再重复。

测试类TestController

@RestController
public class TestController {
  
    @Reference(version = "1.0.0", protocol = "dubbo")
    private EchoRestDubboService echoDubboService;

    @Autowired
    private EchoRestDubboService echoRestService;

    @GetMapping("/echoDubbo")
    String echoDubbo(String name) {
        return echoDubboService.echo(name);
    }

    @GetMapping("/echoRest")
    String echoRest(String name) {
        return echoRestService.echo(name);
    }

}

启动类

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class NacosDubboCloudConsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(NacosDubboCloudConsumerApplication.class, args);
    }

}

配置

server:
  port: 8011
spring:
  application:
    name: nacos-dubbo-cloud-consumer
  main:
      allow-bean-definition-overriding: true
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
dubbo:
  application:
    qos:
      port: 33333
  registry:
    address: spring-cloud://localhost
  cloud:
    subscribed-services: nacos-dubbo-cloud-provider-service
logging:
  level:
    org.apache.dubbo: debug
    com.netflix: debug

依次启动服务提供者和服务消费者，然后访问消费者的两个接口可以看到都能成功，而且通过观察日志，分别是通过Dubbo的RPC和Feign调用的。

【转载请注明出处】： https://juejin.cn/post/6844904186769833997