几秒前，几分钟前，几小时前，几天前，几月前，几年前的java实现-蒲公英云

几秒前，几分钟前，几小时前，几天前，几月前，几年前的java实现

在代码开发的时候，特别是那种论坛啊什么的要返回“几秒前，几分钟前，几小时前，几天前，几月前，几年前”这样的时间格式，服务端那边只肯返回yyyy-MM-dd HHss的格式，没办法，只能客户端加个转换了。

代码如下：

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 = "分钟前";
private static final String ONE_HOUR_AGO = "小时前";
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 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;
}

}
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调用的时候传入时间，今天是2016年1月20号

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    Date date = null;
    try {
        date = format.parse("2015-11-11 18:35:35");
        System.out.println(RelativeDateFormat.format(date));
    } catch (ParseException e) {
        e.printStackTrace();
    }