java 获取日期的几天前，几个月前和几年前.
package bys.utils;import java.util.Date;/*** Created by toutou on /3/23.*/public class DateHelper {public static final long ONE_MINUTE = 60000L;public static final long ONE_HOUR = 3600000L;public static final long ONE_DAY = 86400000L;public 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";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;}public static String getPastTime(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;}}}
调用示例：
String time = DateHelper.getPastTime(Date.from(item.getCreateTime().atZone(ZoneId.systemDefault()).toInstant()));
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