假設增長編號方式為 FE202002020001 即:FE+年月日+四位序號

dao層 ：

public class CmsFinancialInfoDao{

/**獲取最新的編號*/
public String getFinancialInfoMaxCode(String dayStr){
    String sql = "select max(e.expense_code) from cms_financial_expense e where e.expense_code like '"+FinancialConstant.FINANCIAL_INFO_CODE+dayStr+"%'";
    Object maxCode = this.getSession().createSQLQuery(sql).uniqueResult();
 
    if (!EmptyUtils.isEmpty(maxCode)){
        return maxCode.toString();
    }

    return null;
}
}

service層：

public String getSequence(){
    int number = 0;
    String voucherNumber = "";
    String dayStr = DateUtils.format(new Date(),"yyyyMMdd");
    voucherNumber = cmsFinancialInfoDao.getFinancialInfoMaxCode(dayStr);
 
    if(EmptyUtils.isEmpty(voucherNumber)){
        voucherNumber = FinancialConstant.EXPEMSE_CODE+dayStr+"0001";
    }else{
        number = Integer.parseInt(voucherNumber.substring(10,14));//擷取最後四位
        number++;
        voucherNumber = "FE"+dayStr+String.format("%04d",number);
    }
    return  voucherNumber;
 
}