時間轉換工具,顯示幾小時前等

這個幾小時,幾天前的Java工具,也是在網上找的,忘記是哪位前輩高人的,我只是應用而已:
package com.cyyz.angeltrain.comm.utils;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
* 時間轉換顯示工具
* 
* @author Yangzhou
*
* @time 2015年8月11日下午3:50:34
*/
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";
private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

/**
* 時間轉換顯示
* 
* @param time
* 幾天前
* @return
*/
public static String format(String time) {

long currentTime = (new Date()).getTime();
Date date;
try {
date = sdf.parse(time);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
return time;
}
long delta = currentTime - 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;
return time;
}
}

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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