按年月日自动生成编号

// 存储编号的集合

List purchaseNoList =new ArrayList<>();

// 获取年月日

Calendar calendar = Calendar.getInstance();

int year = calendar.get(Calendar.YEAR);

int month = calendar.get(Calendar.MONTH) +1;

int date = calendar.get(Calendar.DAY_OF_MONTH);

// 月份格式化（01-12）

String formattedMonth = String.format("%02d", month);

// 日期格式化（01-31）

String formattedDay = String.format("%02d", date);

String time = year +"-" + formattedMonth +"-" + formattedDay +"-";

//获取数据库的最大编号 

String maxRefundNo =materialPurchaseMapperEx.selectMaxPurchaseNo(time);

int number =0;

if (StringUtils.isNotBlank(maxRefundNo)) {

number = Integer.parseInt(maxRefundNo);

}

for (Integer i =0; i < noNum; i++) {

number++;

//编号格式（%04d：四位  0001） 

String formattedStr = String.format("%04d", number);

String purchaseNo = time + formattedStr;

purchaseNoList.add(purchaseNo);

}

return purchaseNoList;