Spring Cloud Alibaba 使用 feign 和 rebion 进行服务消费

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

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

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

spring:
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848

@SpringBootApplication
//将服务注册到注册中心
@EnableDiscoveryClient
//扫描和注册feign客户端bean定义
@EnableFeignClients
public class NacosConsumeApplication {

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

}

@FeignClient(value = "service-provider")
public interface ProductClient {

    @GetMapping("/hello")
    String product(@RequestParam("name") String name);
}

@RestController
public class FeignController {


    //这个错误是编译器问题。因为这个Bean是在程序启动的时候注入的，编译器感知不到，所以报错。
    @Autowired
    private ProductClient productClient;

    @GetMapping("/feign")
    public String feign(String name){
        return productClient.product(name);
    }

}

@Configuration
public class RibbonConfig {

  @LoadBalanced
  @Bean
  public RestTemplate restTemplate(){
      return new RestTemplate();
  }
}

@RestController
public class RibbonController {

  @Autowired
  private RestTemplate restTemplate;

  @GetMapping("/ribbon")
  public String ribbon(String name){
      String result = restTemplate.getForObject("http://service-provider/hello?name="+name,String.class);
      return result;
  }
}