Java时间处理（xx天前、xx年前）

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import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

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)) + "小时前";

} 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));

}

}