java相对时间的工具类,此类中有两个暴露的方法，相对于当前时间的方法和相对于某时间的方法。
返回String，如：2小时前/3天2时13秒/昨天
具体请运行查看
（DateTimeFormatUtil.getStrDate(date, form);为将毫秒数转换为格式化日期的方法，自己编写）
package com.warmdoctor.service.util;import java.util.Date;/** * Copyright 2016 CoderDream's Eclipse * * All right reserved. * * Created on 2016年8月5日 下午5:20:32 * * Update on 2016年8月10日 下午2:18:29 * * @author xiaoming * * @mail sgyingyin@sina.com * * @tags An overview of this file: 相对时间转换 * */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_CN = "秒"; private static final String ONE_MINUTE_CN = "分钟"; private static final String ONE_HOUR_CN = "小时"; private static final String ONE_DAY_CN = "天"; private static final String ONE_MONTH_CN = "月"; private static final String ONE_YEAR_CN = "年"; private static final String ONE_AGO = "前"; /** * @author xiaoming 2016年8月5日 * @describe 相对于当前时间 * @param date * @return * @returnType String */ public static String format(Date date) { if(date == null) date = new Date(); long delta = new Date().getTime() - date.getTime(); if (delta < 1L * ONE_MINUTE) { long seconds = toSeconds(delta); return (seconds <= 0 ? 1 : seconds) + ONE_SECOND_CN + ONE_AGO; } if (delta < 45L * ONE_MINUTE) { long minutes = toMinutes(delta); return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_CN + ONE_AGO; } if (delta < 24L * ONE_HOUR) { long hours = toHours(delta); return (hours <= 0 ? 1 : hours) + ONE_HOUR_CN + ONE_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_CN + ONE_AGO; } if (delta < 12L * 4L * ONE_WEEK) { long months = toMonths(delta); return (months <= 0 ? 1 : months) + ONE_MONTH_CN + ONE_AGO; } else { long years = toYears(delta); return (years <= 0 ? 1 : years) + ONE_YEAR_CN + ONE_AGO; } } /** * @author xiaoming 2016年8月5日 * @describe 相对于某个时间， 计算时间差 * @param date * @param ofDate 最后时间 * @return * @returnType String */ public static String formatOfDate(Date date, Date ofDate) { if(date == null) date = new Date(); if(ofDate == null) ofDate = new Date(); long delta = ofDate.getTime() - date.getTime(); delta = Math.abs(delta); long s = toSeconds(delta); long min = toMinutes(delta); long hour = toHours(delta); long day = toDays(delta); long month = toMonths(delta); long year = toYears(delta); if(year > 0) return DateTimeFormatUtil.getStrDate(delta, "yyyy年MM月dd天HH时mm分ss秒"); if(month > 0) return DateTimeFormatUtil.getStrDate(delta, "MM月dd天HH时mm分ss秒"); if(day > 0) return DateTimeFormatUtil.getStrDate(delta, "dd天HH时mm分ss秒"); if(hour > 0) return DateTimeFormatUtil.getStrDate(delta, "HH时mm分ss秒"); if(min > 0) return DateTimeFormatUtil.getStrDate(delta, "mm分ss秒"); return s + ONE_SECOND_CN; } 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; }}