日期工具类

package net.baiqu.shop.data.core.util;

import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.util.Assert;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author by ericzhang on 2018-01-22.
 * 日期工具类。
 */
@Slf4j
public class DateUtils {

    public static final long MILLIS_PER_SECOND = 1000;
    public static final long MILLIS_PER_MINUTE = 60 * MILLIS_PER_SECOND;
    public static final long MILLIS_PER_HOUR = 60 * MILLIS_PER_MINUTE;
    public static final long MILLIS_PER_DAY = 24 * MILLIS_PER_HOUR;

    public static final Date MAX_DATE = new Date(253370814513298L);

    private static final String DEFAULT_FORMAT = "yyyy-MM-dd";

    private static final Map<String, DateFormat> DATEFORMATMAP = new ConcurrentHashMap<>();

    static {
        DATEFORMATMAP.put("yyyy-MM-dd", new SimpleDateFormat("yyyy-MM-dd"));
        DATEFORMATMAP.put("yyyy-MM-dd HH:mm:ss", new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
        DATEFORMATMAP.put("yyyy-MM-dd hh:mm:ss", new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"));
        DATEFORMATMAP.put("yyyy/MM/dd", new SimpleDateFormat("yyyy/MM/dd"));
        DATEFORMATMAP.put("yyyy/MM/dd hh:mm:ss", new SimpleDateFormat("yyyy/MM/dd hh:mm:ss"));
        DATEFORMATMAP.put("yyyy/MM/dd HH:mm:ss", new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"));
        DATEFORMATMAP.put("yyyyMMdd", new SimpleDateFormat("yyyyMMdd"));
        DATEFORMATMAP.put("yyyyMMddhhmmss", new SimpleDateFormat("yyyyMMddhhmmss"));
    }

    private DateUtils() {
    }


    /**
     * 时间搓转日期
     *
     * @param seconds
     * @param pattern
     * @return
     */
    public static String timeStamp2Date(String seconds, String pattern) {
        Assert.hasLength(seconds, "no seconds parameter");
        DateFormat dateFormat = getFormat(pattern);
        return dateFormat.format(new Date(Long.valueOf(seconds + "000")));
    }


    public static String stampToDate(String s, String pattern) {
        String res;
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(pattern);
        long lt = new Long(s);
        Date date = new Date(lt);
        res = simpleDateFormat.format(date);
        return res;
    }

    /**
     * 获取此日期的同一天凌晨零点的Date
     */
    public static Date getMorning(Date date) {
        String dateStr = formatToString(date, "yyyyMMdd");
        return fromString(dateStr, "yyyyMMdd");
    }

    /**
     * 获取此日期的同一天第二天凌晨零点的Date
     */
    public static Date getNight(Date date) {
        long time = getMorning(date).getTime();
        long night = time + MILLIS_PER_DAY;
        return new Date(night);
    }

    /**
     * 获取当前日期的同一天凌晨零点的时间戳
     */
    public static Long getMorningTimestamp() {
        return getMorning(new Date()).getTime();
    }

    /**
     * 获取此日期的同一天凌晨零点的时间戳
     */
    public static Long getMorningTimestamp(Date date) {
        return getMorning(date).getTime();
    }


    /**
     * 获取2日期相差天数 ,包含头尾
     * pattern yyyy-MM-dd
     *
     * @param beg
     * @param end
     * @return
     */
    public static int getBetDays(String beg, String end) throws ParseException {
        DateFormat sdf = getFormat("yyyy-MM-dd");
        //new SimpleDateFormat("yyyy-MM-dd");
        //跨年不会出现问题
        //如果时间为：2016-03-18 11:59:59 和 2016-03-19 00:00:01的话差值为 0
        Date fDate = sdf.parse(beg);
        Date oDate = sdf.parse(end);
        return (int) ((oDate.getTime() - fDate.getTime()) / (1000 * 3600 * 24)) + 1;
    }


    /**
     * 判断两个日期是否为同一天。
     */
    public static boolean isOneDay(Date date1, Date date2) {
        Calendar c1 = Calendar.getInstance();
        Calendar c2 = Calendar.getInstance();
        c1.setTime(date1);
        c2.setTime(date2);
        return c1.get(Calendar.YEAR) == c2.get(Calendar.YEAR) && (c1.get(Calendar.MONTH) == c2.get(Calendar.MONTH)) && c1.get(Calendar.DAY_OF_MONTH) == c2.get(Calendar.DAY_OF_MONTH);
    }

    /**
     * Date==>String
     */
    public static String formatToString(Date date, String pattern) {
        Assert.notNull(date, "date not be null");
        DateFormat dateFormat = getFormat(pattern);
        return dateFormat.format(date);
    }

    /**
     * Date==>String
     */
    public static int formatToInt(Date date, String pattern) {
        Assert.notNull(date, "date not be null");
        DateFormat dateFormat = getFormat(pattern);
        return Integer.parseInt(dateFormat.format(date));
    }

    /**
     * String==>Date
     */
    public static Date fromString(String dateString, String pattern) {
        Assert.hasLength(dateString, "dateString must have length");
        DateFormat dateFormat = getFormat(pattern);
        try {
            return dateFormat.parse(dateString);
        } catch (ParseException e) {
            throw new IllegalArgumentException("日期解析错误。");
        }
    }

    /**
     * 是否是周末。
     */
    public static boolean isWeekEnd(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int dayOfWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1;
        return dayOfWeek < 1 || dayOfWeek > 5;
    }

    /**
     * 以天为单位拨动时间。
     *
     * @param date 要修改的日期
     * @param day  修改的数量
     */
    public static Date addDay(Date date, int day) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DATE, day);
        return calendar.getTime();
    }

    /**
     * 以月为单位拨动时间。
     *
     * @param date  要修改的日期
     * @param month 修改的数量
     */
    public static Date addMonth(Date date, int month) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.MONTH, month);
        return calendar.getTime();
    }

    /**
     * 以年为单位拨动时间。
     *
     * @param date 要修改的日期
     * @param year 修改的数量
     */
    public static Date addYear(Date date, int year) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.MONTH, year);
        return calendar.getTime();
    }

    /**
     * 此日期的当月第一天。
     */
    public static Date monthFirstDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        return calendar.getTime();
    }

    private static DateFormat getFormat(String pattern) {
        DateFormat dateFormat;
        if (StringUtils.isBlank(pattern)) {
            dateFormat = DATEFORMATMAP.get(DEFAULT_FORMAT);
        } else {
            dateFormat = DATEFORMATMAP.get(pattern);
            if (dateFormat == null) {
                dateFormat = new SimpleDateFormat(pattern);
                DATEFORMATMAP.put(pattern, dateFormat);
            }
        }
        return dateFormat;
    }

    /**
     * 给定时间的前/后sencodes秒时间
     *
     * @param now    时间
     * @param second 前/后秒数，负数为前X秒
     * @return
     */
    public static Date getAddSeconds(Date now, Integer second) {
        if (null == now) {
            return null;
        }
        Calendar c = Calendar.getInstance();
        c.setTime(now);
        c.add(Calendar.SECOND, second);
        return c.getTime();
    }


    public static boolean isValidDate(String date, String pattern) {
        boolean convertSuccess = true;
        //指定日期格式为四位年/两位月份/两位日期，注意yyyy/MM/dd区分大小写；
        SimpleDateFormat format = new SimpleDateFormat(pattern);
        try {
            //设置lenient为false. 否则SimpleDateFormat会比较宽松地验证日期，比如2007/02/29会被接受，并转换成2007/03/01
            format.setLenient(false);
            format.parse(date);
        } catch (ParseException e) {
            // 如果throw java.text.ParseException或者NullPointerException，就说明格式不对
            convertSuccess = false;
        }

        return convertSuccess;
    }

    /**
     * 获取当天的开始时间
     */
    public static Date getDayBegin() {
        Calendar cal = new GregorianCalendar();
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }

    /**
     * 获取指定日期的开始时间 以00:00:00结尾
     */
    public static Date getAppointDayBegin(Date date) {
        Calendar cal = new GregorianCalendar();
        cal.setTime(date);
        cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        return cal.getTime();
    }

    /**
     * 获取当月的起始时间
     */
    public static Date getCurrentMonthStartTime() {
        Calendar c = Calendar.getInstance();
        c.set(Calendar.DATE, 1);
        c.set(Calendar.HOUR_OF_DAY, 0);
        c.set(Calendar.MINUTE, 0);
        c.set(Calendar.SECOND, 0);
        c.set(Calendar.MILLISECOND, 0);
        return c.getTime();
    }

    /**
     * 获取当年的起始时间
     */
    public static Date getCurrentYearStartTime() {
        Calendar yearStart = Calendar.getInstance();
        yearStart.set(Calendar.MONTH, 0);
        yearStart.set(Calendar.DATE, 1);
        yearStart.set(Calendar.HOUR_OF_DAY, 0);
        yearStart.set(Calendar.MINUTE, 0);
        yearStart.set(Calendar.SECOND, 0);
        yearStart.set(Calendar.MILLISECOND, 0);
        return yearStart.getTime();
    }

    /**
     * 获取今天最后一秒
     *
     * @return 当天最后一秒
     */
    public static Long getTodaySurplusSecond() {
        Calendar cal = new GregorianCalendar();
        cal.set(Calendar.HOUR_OF_DAY, 23);
        cal.set(Calendar.MINUTE, 59);
        cal.set(Calendar.SECOND, 59);
        cal.set(Calendar.MILLISECOND, 999);

        long end = cal.getTime().getTime();
        long star = System.currentTimeMillis();
        return (end - star) / 1000;
    }

    /**
     * 获取 类似：2018.02.01 20:11:11 的日期格式
     *
     * @param date 日期
     * @return 日期
     */
    public static String getPointDate(Date date) {
        Calendar cal = new GregorianCalendar();
        cal.setTime(date);
        int year = cal.get(Calendar.YEAR);
        int month = cal.get(Calendar.MONTH) + 1;
        int day = cal.get(Calendar.DAY_OF_MONTH);
        int hour = cal.get(Calendar.HOUR_OF_DAY);
        int minute = cal.get(Calendar.MINUTE);
        int second = cal.get(Calendar.SECOND);
        return year + "." + month + "." + day + " " + (hour < 10 ? "0" + hour : hour) + ":" + (minute < 10 ? "0" + minute : minute) + ":" + (second < 10 ? "0" + second : second);
    }

    public static String getMMDDHHMMDate(Date date) {
        SimpleDateFormat sdf = new SimpleDateFormat("MM-dd HH:mm");
        return sdf.format(date);
    }

    /**
     * 获取指定日期所在月第一天
     *
     * @param date 指定日期
     * @return
     */
    public static String getMonthFirstDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.MONTH, 0);
        calendar.set(Calendar.DAY_OF_MONTH, 1);
        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd 00:00:00");

        return sf.format(calendar.getTime());
    }

    /**
     * 获取指定日期所在月最后一天
     *
     * @param date 指定日期
     * @return
     */
    public static String getMonthLastDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.MONTH, 1);
        calendar.set(Calendar.DAY_OF_MONTH, 0);
        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd 23:59:59");

        return sf.format(calendar.getTime());
    }

    /**
     * 根据指定日期获取当月包含的天数数组
     *
     * @return
     */
    public static String[] getDaysByDate(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.set(Calendar.DATE, 1);
        calendar.roll(Calendar.DATE, -1);
        int maxDate = calendar.get(Calendar.DATE);
        log.info("maxDate:{}", maxDate);

        String[] str = new String[maxDate];
        for (int i = 1; i <= maxDate; i++) {
            if (i < 10) {
                str[i - 1] = "0" + i;
            } else {
                str[i - 1] = i + "";
            }
        }
        return str;
    }


    /**
     * 获取过去第几天的日期
     *
     * @param past
     * @return
     */
    public static String getPastDate(int past) {
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) - past);
        Date today = calendar.getTime();
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
        String result = format.format(today);
        return result;
    }

    /**
     * 获取近7天日期
     *
     * @return
     */
    public static List<String> getSevenDays() {
        List<String> list = new ArrayList<>();
        for (int i = 0; i < 7; i++) {
            list.add(getPastDate(i));
        }
        return list;
    }

    /**
     * 获取近n天日期
     *
     * @return
     */
    public static List<String> getNDays(int n) {
        List<String> list = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            list.add(getPastDate(i));
        }
        return list;
    }

    /**
     * 获取过去第几个月
     *
     * @param i
     * @return
     */
    public static String getLastMonths(int i) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
        Calendar c = Calendar.getInstance();
        c.setTime(new Date());
        c.add(Calendar.MONTH, -i);
        Date m = c.getTime();
        return sdf.format(m);
    }

    /**
     * 获取近6个月日期
     *
     * @return
     */
    public static List<String> getSixMonths() {
        List<String> list = new ArrayList<>();
        for (int i = 0; i < 6; i++) {
            list.add(getLastMonths(i));
        }
        return list;
    }

    /**
     * 通过时间秒毫秒数判断两个时间的间隔
     *
     * @param date1 较小时间
     * @param date2 较大时间
     * @return
     */
    public static int differentDays(Date date1, Date date2) {
        int days = (int) ((date2.getTime() - date1.getTime()) / (1000 * 3600 * 24));
        return days;
    }

}