springcloud feign 服务之间调用，date类型转换错误解决方案

feign 服务之间调用，date类型转换错误解决方案

最近尝试换springcloud开发，原先是springboot，每次的返回值的Date类型都通过@ControllerAdvice格式化yyyy-MM-dd HH:mm:ss然后返回的。这次用feign之后，2个服务之间调用，一直报错查了好久百度都搞不定，后面灵光一闪。。。不多说，上方案

1.自定义feign请求头，标识只有feign请求会多一个flag头

@Configuration
public class FeignHeaderConfig implements RequestInterceptor {

    @Override
    public void apply(RequestTemplate requestTemplate) {
        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
                .getRequestAttributes();
        HttpServletRequest request = attributes.getRequest();
        String token = request.getHeader(C.API_HEADER_PARAM_TOKEN);
        String session = request.getHeader(C.API_HEADER_PARAM_SESSION);
        String timestamp = request.getHeader(C.API_HEADER_PARAM_TIMESTAMP);

        requestTemplate.header(C.API_HEADER_PARAM_TOKEN, token);
        requestTemplate.header(C.API_HEADER_PARAM_SESSION,session);
        requestTemplate.header(C.API_HEADER_PARAM_TIMESTAMP,timestamp);
        requestTemplate.header("flag","feign");//标识feign请求
    }

}

2.通过判断是否为feign请求再决定是否需要格式化时间

@ControllerAdvice
@Slf4j
public class RespondeBodyConfig implements ResponseBodyAdvice {


    @Override
    public Object beforeBodyWrite(Object resBody, MethodParameter arg1, MediaType arg2, Class arg3, ServerHttpRequest req,
                                  ServerHttpResponse res) {
       //解决feign之间调用格式化，导致date类型转换错误
        List<String> flag = req.getHeaders().get("flag");
        if(flag != null && flag.size() > 0 && flag.get(0).equals("feign")){
            return resBody;
        }
        //resBody就是controller方法中返回的值，对其进行修改后再return就可以了
        ObjectMapper mapper = new ObjectMapper();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        mapper.setDateFormat(format);

        try {
            if(resBody instanceof TResult) {
                String json = mapper.writeValueAsString(resBody);
                return JSONObject.parseObject(json, TResult.class);
            }
        } catch (Exception e) {
            log.error("【全局返回值处理失败】",e);
        }
        return resBody;
    }

    @Override
    public boolean supports(MethodParameter arg0, Class arg1) {
        //这里直接返回true,表示对任何handler的responsebody都调用beforeBodyWrite方法
        return true;
    }


}

希望对碰到同样问题的人有帮助