@Component
@FeignClient(value = "CLOUD-PROVIDER-HYSTRIX-PAYMENT",fallback = PaymentFallbackService.class)
public interface PaymentHystrixService {
    @GetMapping("/payment/hystrix/ok/{id}")
    public String paymentInfo_OK(@PathVariable("id") Integer id);
    @GetMapping("/payment/hystrix/timeout/{id}")
    public String paymentInfo_TimeOut(@PathVariable("id") Integer id);
}

@Component // 这个注解不能少
public class PaymentFallbackService implements PaymentHystrixService {
    @Override
    public String paymentInfo_OK(Integer id) {
        return "---PaymentFabllbackService fall back-paymentInfo_OK";
    }
    @Override
    public String paymentInfo_TimeOut(Integer id) {
        return "---PaymentFabllbackService fall back-paymentInfo_TimeOut";
    }
}