Alibaba Sentinel实现服务降级

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-sentinel</artifactId>
        </dependency>

feign:
  sentinel:
    enabled: true

@FeignClient(name = "common-message",fallback = MessageFeignClientFallback.class)
public interface MessageFeignClient {
    @ResponseBody
    @RequestMapping(value = "/sms/{phone}/{code}",method = RequestMethod.GET)
    public String sendSms(@PathVariable(name = "phone") String phone, @PathVariable(name = "code") String code);
}

@Component
public class MessageFeignClientFallback implements MessageFeignClient {
    @Override
    public String sendSms(String phone, String code) {
        return "Message 服务已关闭，请联系管理员启动";
    }
}