JAVA 用时间生成主键ID

/** 
      *   生成主键(19位数字)
      *  主键生成方式,年月日时分秒毫秒的时间戳 例如：1810311557430000845
      */ 
    public static synchronized Long getUUIDTOLongNew(){
        try {
            TimeUnit.NANOSECONDS.sleep(1000000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        String msg=""; 
        Date date = new Date(); 
        SimpleDateFormat sdf = new SimpleDateFormat("yyMMddHHmmssSSSSSSS"); //1810311557430000845
//        msg = sdf.format(date).substring(2); 
        return Long.parseLong(sdf.format(date));
    }

 /** 
  *   生成主键(17位数字)
  *  主键生成方式,年月日时分秒毫秒的时间戳 例如：180910094204299
    */ 
public static synchronized Long getUUIDTOLong(){
   try {
      Thread.sleep(1);
   } catch (InterruptedException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
   }
   String msg=""; 
   Date date = new Date(); 
   SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS"); 
   msg = sdf.format(date).substring(2); 
   return Long.parseLong(msg);
}