Optional类的使用

对多层的dto中的数据进行操作时，需要进行判空处理时，使用optional来进行判空，简化代码

 Optional.ofNullable(bankCard).map(b->b.getQueryBindCardsResponseDto()).ifPresent(bindCard->{
             Optional.ofNullable(bindCard.getDefaultCard()).map(d->d.getCardNo()).ifPresent(cardNo->{
                 try{
                     bankCard.getQueryBindCardsResponseDto().getDefaultCard().setCardNo(DESUtil.aesEncrypt(cardNo, DESUtil.KEY));
                 }catch (Exception e){
                     log.info("支付工具卡号加密异常，异常",e);
                 }
             });
             Optional.ofNullable(bindCard.getEnableCardList()).filter(list-> !list.isEmpty()).ifPresent(enableCardList->{
                     enableCardList.forEach(record->{
                         try{
                            record.setCardNo(DESUtil.aesEncrypt(record.getCardNo(), DESUtil.KEY));
                         }catch (Exception e){
                             log.info("支付工具卡号加密异常，异常",e);
                         }
                     });
             });
             log.info("没有问题");
             Optional.ofNullable(bindCard.getDisableCardList()).filter(list-> !list.isEmpty()).ifPresent(disableCardList->{
                 disableCardList.forEach(record->{
                     try{
                         record.setCardNo(DESUtil.aesEncrypt(record.getCardNo(), DESUtil.KEY));
                     }catch (Exception e){
                         log.info("支付工具卡号加密异常，异常",e);
                     }
                 });
             });
         });