java获取n分钟、n小时前等

package com.liang.util;

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

/**
* 相对当前日期格式化工具
*
* @author Administrator
*
*/
public class RelativeCurrentDateFormatUtil {

public static final SimpleDateFormat FORMAT_TIMESTAMP = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
public static final SimpleDateFormat FORMAT_DATE = new SimpleDateFormat("yyyy-MM-dd");

/********* 单位：毫秒 ********/

private static final long ONE_MINUTE = 60000L; // 一分钟
private static final long ONE_HOUR = 3600000L; // 一小时
private static final long ONE_DAY = 86400000L; // 一天
private static final long ONE_MONTH = 2592000000L; // 一个月（按30天计算）
private static final long ONE_YEAR = 31104000000L; // 一年

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";

/**
* 获取刚刚、n秒前、n分钟前、n小时前、昨天、前天、n天前、n月前、n年前
*
* @param dateStr
* 日期字符串
* @return 格式化后串
* @throws ParseException
*/
public static String format(String dateStr) throws ParseException {
Date date;
if (dateStr.contains(" ")) {
date = FORMAT_TIMESTAMP.parse(dateStr);
} else {
date = FORMAT_DATE.parse(dateStr);
}
long delta = new Date().getTime() - date.getTime();
if (delta < ONE_MINUTE) {
long seconds = toSeconds(delta);
return seconds <= 0 ? "刚刚" : seconds + ONE_SECOND_AGO;
}
if (delta < ONE_HOUR) {
long minutes = toMinutes(delta);
return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_AGO;
}
if (delta < ONE_DAY) {
long hours = toHours(delta);
return (hours <= 0 ? 1 : hours) + ONE_HOUR_AGO;
}
if (delta < 2L * ONE_DAY) {
return "昨天";
}
if (delta < 3L * ONE_DAY) {
return "前天";
}
if (delta < ONE_MONTH) {
long days = toDays(delta);
return (days <= 0 ? 1 : days) + ONE_DAY_AGO;
}
if (delta < ONE_YEAR) {
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) / 12L;
}

public static void main(String[] args) throws ParseException {
System.out.println(format("2016-01-15 09:00:00"));
}

}
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