计算时间差

public class testDateCompare {

public static void main(String[] args) {
  String date1="2011-01-29 16:12:20";
  String date2="2011-01-29 16:12:25";
  System.out.println(dateCompareForString(date1,date2));
}
/**
  *
  * @param date1 较小的时间
  * @param date2 较大的时间
  * @return
  */
private static String dateCompareForString(String date1, String date2){
    String result = "";
    SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    Date bigDate;
    Date smalDate;
try {
  bigDate = df.parse(date2);
  smalDate=df.parse(date1);
  long l=bigDate.getTime()-smalDate.getTime();
  long day=l/(24*60*60*1000);
  long hour=(l/(60*60*1000)-day*24);
  long min=((l/(60*1000))-day*24*60-hour*60);
  long s=(l/1000-day*24*60*60-hour*60*60-min*60);
  result = min+"分"+s+"秒";
} catch (ParseException e) {
  e.printStackTrace();
}
  return result;
}
}