java 流水账号生成_一个简易的流水账号实现方式(java)

private static Hashtable seq = new Hashtable(); public synchronized static String getOrderSeq(){  String rtv = "0000";  String datetimeKey=new SimpleDateFormat("yyyyMMdd").format(new Date());  if ( seq.keySet().size()==0){   seq.put(datetimeKey, 0);  } else {   if ( seq.get(datetimeKey) == null){    seq.clear();    seq.put(datetimeKey, 0);   } else {    int order =seq.get(datetimeKey)+1;    String orderStr = ""+order;    int len= rtv.length();    int sub=orderStr.length();    if ( len-sub>=0){     rtv = rtv.substring(0,len-sub);     rtv = rtv+ orderStr;    }    else     rtv = orderStr;    seq.put(datetimeKey,order);   }  }  rtv = datetimeKey +rtv;  return rtv; }

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