Java時間處理（xx天前、xx年前）

import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;/** *  * @author Robot * */public class test {public static Date getDateByString(String time) {Date date = null;if(time == null) return date;String date_format = "yyyy-MM-dd HH:mm:ss";SimpleDateFormat format = new SimpleDateFormat(date_format);try {date = format.parse(time);} catch (ParseException e) {e.printStackTrace();}return date;}public static String getShortTime(String time) {String shortstring = null;long now = Calendar.getInstance().getTimeInMillis();Date date = getDateByString(time);if(date == null) return shortstring;long deltime = (now - date.getTime())/1000;if(deltime > 365*24*60*60) {shortstring = (int)(deltime/(365*24*60*60)) + "年前";} else if(deltime > 24*60*60) {shortstring = (int)(deltime/(24*60*60)) + "天前";} else if(deltime > 60*60) {shortstring = (int)(deltime/(60*60)) + "小時前";} else if(deltime > 60) {shortstring = (int)(deltime/(60)) + "分前";} else if(deltime > 1) {shortstring = deltime + "秒前";} else {shortstring = "1秒前";}return shortstring;}public static void main(String[] args) {String time = "2012-02-28 10:40:55";System.out.println(getShortTime(time));}}