编号生成器 - 记录

两个参数：
String equipmentType：编号前缀，没有就传null或"“;
String equipmentNo：上一个编号，若为第一个编号，可传null或”"，即允许为空；

输出：String newEquipmentNo：新的编号；

工具类：
import java.text.SimpleDateFormat;
import java.util.Date;

	public static String getNewEquipmentNo(String equipmentType, String equipmentNo){
        String newEquipmentNo = "";
        SimpleDateFormat format = new SimpleDateFormat("yyMMdd"); // 时间字符串产生方式
		String today = format.format(new Date()); // 组合流水号前一部分，时间字符串，如：190420
        if(equipmentNo != null && !equipmentNo.isEmpty()){
        	String allNumber = equipmentNo.split(equipmentType)[1];//19042001
        	if(today.equals(allNumber.substring(0, 6))){
        		equipmentNo = allNumber.substring(6);
        	}else{
        		equipmentNo = "000";
        	}
        	
            int newEquipment = Integer.parseInt(equipmentNo) + 1;
            newEquipmentNo = String.format(equipmentType + today + "%03d", newEquipment);
        }else{
        	newEquipmentNo = String.format(equipmentType + today + "%03d", 001);
        }

        return newEquipmentNo;
    }