生成近似的uuid

 private static long tmpID = 0;
 
 private static boolean tmpIDlocked = false;

 
 private static long getUniqueId() {
  long ltime = 0;
  while (true) {
   if(tmpIDlocked == false) {
    tmpIDlocked= true;
    ltime= Long.valueOf(new SimpleDateFormat("yyMMddhhmmssSSS")
      .format(newDate()).toString()) * 10000;
    if(tmpID < ltime) {
     tmpID= ltime;
    }else {
     tmpID= tmpID + 1;
     ltime= tmpID;
    }
    tmpIDlocked= false;
    returnltime;
   }
  }
 }