SpringCloud OpenFeign自定义结果解码器方式

public class Result<T> {
    /**
     * 响应码，200为成功
     */
    private Integer code;
    /**
     * 失败时的具体失败信息
     */
    private String message;
    /**
     * 失败信息是否为用户提示，如果是的话框架不会主动拦截该错误
     */
    private boolean userPrompt;
    /**
     * 响应的具体对象
     */
    private T data;
}

@FeignClient(name = "stores", configuration = CustomizedConfiguration.class)
public interface StoreClient {
    //..
}

public class FeignResultDecoder implements Decoder {
    @Override
    public Object decode(Response response, Type type) throws IOException, DecodeException, FeignException {
        if (response.body() == null) {
            throw new DecodeException(response.status(), "没有返回有效的数据", response.request());
        }
        String bodyStr = Util.toString(response.body().asReader(Util.UTF_8));
        //对结果进行转换
        Result result = (Result) JsonUtil.json2obj(bodyStr, type);
        //如果返回错误，且为内部错误，则直接抛出异常
        if (result.getCode() != ResultCode.SUCCESS.code) {
            if (!result.isUserPrompt()) {
                throw new DecodeException(response.status(), "接口返回错误：" + result.getMessage(), response.request());
            }
        }
        return result.data;
    }
}

public static <T> T json2obj(String jsonStr, Type targetType) {
        try {
            JavaType javaType = TypeFactory.defaultInstance().constructType(targetType);
            return mapper.readValue(jsonStr, javaType);
        } catch (IOException e) {
            throw new IllegalArgumentException("将JSON转换为对象时发生错误:" + jsonStr, e);
        }
    }

public class CustomizedConfiguration{
    @Bean
    public Decoder feignDecoder() {
        return new FeignResultDecoder();
    }
}

@GetMapping("/api/user/detail")
 public Result<User> detailById(@RequestParam("id") Integer id) {
        User user = userService.getById(id);
        return ResultGenerator.genSuccessResult(user);
 }

 @RequestMapping(value = "/api/user/detail", method = RequestMethod.GET)
 public User detailById(@RequestParam("id") Integer id)