/* 
 * 将时间转换为时间戳
 */  
public static String dateToStamp(String s) throws ParseException{
  String res;
  SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  Date date = simpleDateFormat.parse(s);
  long ts = date.getTime();
  res = String.valueOf(ts);
  return res;
}

/* 
 * 将时间戳转换为时间
 */
public static String stampToDate(String s){
  String res;
  SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  long lt = new Long(s);
  Date date = new Date(lt);
  res = simpleDateFormat.format(date);
  return res;
}