前言

默认 Feign 是不启用 Hystrix 的，需要添加如下配置启用 Hystrix，这样所有的 Feign Client 都会受到 Hystrix 保护！

新增配置

feign:
  hystrix:
    enabled: true

提供 Fallback

@FeignClient(name = "microservice-provider-user", fallback = UserFeignClientFallback.class)
public interface UserFeignClient {@GetMapping("/users/{id}")
  User findById(@PathVariable("id") Long id);
}

@Component
class UserFeignClientFallback implements UserFeignClient {
  @Override
  public User findById(Long id) {return new User(id, "默认用户", "默认用户", 0, new BigDecimal(1));
  }
}

获取原因

@FeignClient(name = "shop-provider-user", fallbackFactory  = UserFeignClientFallbackFactory.class)
public interface UserFeignClient {@GetMapping("/users/{id}")
  User findById(@PathVariable("id") Long id);
}


@Component
@Slf4j
class UserFeignClientFallbackFactory implements FallbackFactory<UserFeignClient> {
  @Override
  public UserFeignClient create(Throwable throwable) {return new UserFeignClient() {
      @Override
      public User findById(Long id) {log.error("进入回退逻辑", throwable);
        return new User(id, "默认用户", "默认用户", 0, new BigDecimal(1));
      }
    };
  }
}