幾秒前，幾分鐘前，幾小時前，幾天前，幾月前，幾年前的java實現代碼

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

public class RelativeDateFormat {

private static final long ONE_MINUTE = 60000L;  
private static final long ONE_HOUR = 3600000L;  
private static final long ONE_DAY = 86400000L;  
private static final long ONE_WEEK = 604800000L;  

private static final String ONE_SECOND_AGO = "秒前";  
private static final String ONE_MINUTE_AGO = "分鐘前";  
private static final String ONE_HOUR_AGO = "小時前";  
private static final String ONE_DAY_AGO = "天前";  
private static final String ONE_MONTH_AGO = "月前";  
private static final String ONE_YEAR_AGO = "年前";  

public static void main(String[] args) throws ParseException {  
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:m:s");  
    Date date = format.parse("2013-11-11 18:35:35");  
    System.out.println(format(date));  
}  

public static String format(Date date) {  
    long delta = new Date().getTime() - date.getTime();  
    if (delta < 1L * ONE_MINUTE) {  
        long seconds = toSeconds(delta);  
        return (seconds <= 0 ? 1 : seconds) + ONE_SECOND_AGO;  
    }  
    if (delta < 45L * ONE_MINUTE) {  
        long minutes = toMinutes(delta);  
        return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_AGO;  
    }  
    if (delta < 24L * ONE_HOUR) {  
        long hours = toHours(delta);  
        return (hours <= 0 ? 1 : hours) + ONE_HOUR_AGO;  
    }  
    if (delta < 48L * ONE_HOUR) {  
        return "昨天";  
    }  
    if (delta < 30L * ONE_DAY) {  
        long days = toDays(delta);  
        return (days <= 0 ? 1 : days) + ONE_DAY_AGO;  
    }  
    if (delta < 12L * 4L * ONE_WEEK) {  
        long months = toMonths(delta);  
        return (months <= 0 ? 1 : months) + ONE_MONTH_AGO;  
    } else {  
        long years = toYears(delta);  
        return (years <= 0 ? 1 : years) + ONE_YEAR_AGO;  
    }  
}  

private static long toSeconds(long date) {  
    return date / 1000L;  
}  

private static long toMinutes(long date) {  
    return toSeconds(date) / 60L;  
}  

private static long toHours(long date) {  
    return toMinutes(date) / 60L;  
}  

private static long toDays(long date) {  
    return toHours(date) / 24L;  
}  

private static long toMonths(long date) {  
    return toDays(date) / 30L;  
}  

private static long toYears(long date) {  
    return toMonths(date) / 365L;  
}  


}  </pre>來自：http://blog.csdn.net/yaerfeng/article/details/18548079