Hystrix之通配服务降级FeignFallback()，此方

第一步：
配置yml文件，启动hystrix对断路器的支持，如下：

feign:
  hystrix:
    enabled: true

第二步：
创建降级(兜底)处理类，实现FeignClient接口，示例如下：

@Component
public class PaymentHystrixFallbackService implements PaymentHystrixService{
    @Override
    public CommonResult paymentInfo_OK(Integer id) {
        return new CommonResult(ResultCode.FAIL.getCode(),ResultCode.FAIL.getMsg(),"------PaymentHystrixService fall back-paymentInfo_OK");
    }

    @Override
    public CommonResult paymentInfo_TimeOut(Integer id) {
        return new CommonResult(ResultCode.FAIL.getCode(),ResultCode.FAIL.getMsg(),"------PaymentHystrixService fall back-paymentInfo_TimeOut");
    }
}

第三步：
@FeignClient注解中增加fallback属性，指向兜底处理类fallback = PaymentHystrixFallbackService.class，示例如下：

@FeignClient(name = "cloud-provider-hystrix-payment", fallback = PaymentHystrixFallbackService.class)
public interface PaymentHystrixService {

    @GetMapping("/payment/hystrix/ok/{id}")
    CommonResult paymentInfo_OK(@PathVariable("id") Integer id);

    @GetMapping("/payment/hystrix/timeout/{id}")
    CommonResult paymentInfo_TimeOut(@PathVariable("id") Integer id);

}