项目中需要获取Json某个字段名称

譬如：获取改Json中orderNo字段的值

{
 "sign":"f/gRYw0q0LjtcqAfEGLu/nyAiKRNRdFSA323SG4ZdnTvhnwxAjpSt+49AwJRc9gG81KveSr09D5/7dYIt0N4TLLR396wwc1+XLiXviH4MlExOawnAxmC4x5D2n1tnDorsU1GhakS/W1pxYU29LHwDXpzReZ+Pa3bBwxSs2Ob0c4=",
 "body":{
  "proposalNo":"T211517002266000090",
  "areaCode":"150700000000",
  "orderNo":"1453599404018298882",
  "premium":"13.54",
  "resultMess":"审核通过",
  "resultCode":"1",
  "riskCode":"MG"
 }
}

传统获取方式

        String orderNo = "";
        JSONObject jsonObj = JSON.parseObject(result);
        if (jsonObj != null) {
            JSONObject obj = jsonObj.getJSONObject("body");
            if (obj != null) {
                orderNo = obj.getString("orderNo");
            }
        }

使用java8 获取

 JSONObject jsonObj = JSON.parseObject(result);

        // 报文获取订单号
        String orderNo = Optional.ofNullable(jsonObj)
                .flatMap(jsonObject -> Optional.ofNullable(jsonObject.getJSONObject("body")))
                .flatMap(jsonObject -> Optional.ofNullable(jsonObject.getString("orderNo")))
                .orElse(null);

完整代码如下

@Around("pointcut()")
    public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {

        HttpServletRequest httpServletRequest = getHttpServletRequest();
        final String mchNo = httpServletRequest.getHeader("mchNo");

        final String str = JSONObject.toJSONString(proceedingJoinPoint.getArgs());
        String result = StringUtils.removeEnd(StringUtils.removeStart(str, "["), "]");
        JSONObject jsonObj = JSON.parseObject(result);

        // 报文获取订单号
        String orderNo = Optional.ofNullable(jsonObj)
                .flatMap(jsonObject -> Optional.ofNullable(jsonObject.getJSONObject("body")))
                .flatMap(jsonObject -> Optional.ofNullable(jsonObject.getString("orderNo")))
                .orElse(null);

        if (StringUtils.isEmpty(mchNo)) {
            return buildResponse(ApiCodeEnum.mchNo商户号不能为空, "mchNo商户号不能为空", orderNo);
        }

        InsuranceMchQuery query = new InsuranceMchQuery();
        query.setMchNo(mchNo);
        final InsuranceMchVO oneEnhance = insuranceMchService.getOneEnhance(query);

        if (oneEnhance == null) {
            log.debug("【商户号校验】 工保网未配置商户号 订单号:{} ", orderNo);
            return buildResponse(ApiCodeEnum.商户号未授权, "商户未授权", orderNo);
        }

        // 放入缓存
        UnifiedConfigKit.setThreadLocalMch(oneEnhance);

        Object proceed = proceedingJoinPoint.proceed();
        // 删除缓存
        UnifiedConfigKit.removeThreadLocalMch();

        return proceed;
    }