Java 代码优化：使用 Stream API 获取商家信息

List merchantList = supplierOrderDto.stream().map(SupplierOrderDto::getMerchantId).distinct().collect(Collectors.toList()); Map<Long, Integer> merchantMap = merchantService.getConfigByIds(merchantList).stream().collect(Collectors.toMap(YxMerchantConfig::getId, YxMerchantConfig::getTaxpayerType));