通過兩個時間差的毫秒值計算成日時分秒的格式

public String changeTimeType(Long mss){
long hours = mss / (1000 * 60 * 60);
long minutes = (mss % (1000 * 60 * 60)) / (1000 * 60);
long seconds = (mss % (1000 * 60)) / 1000;
StringBuffer bf = new StringBuffer("");
bf.append(hours > 0 ? (hours + "小时") : "");
bf.append(minutes > 0 ? (minutes + "分") : bf.length()>0?"0分":"");
bf.append(seconds >= 0 ? (seconds + "秒") : "");
return bf.toString();
}