java 日期格式化工具类

package com.dongao.project.utils;

import com.ruoyi.common.utils.StringUtils;
import org.apache.commons.lang3.time.DateFormatUtils;

import java.lang.management.ManagementFactory;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * @Version 1.0
 * @Date 2019-08-19
 **/
public class DateUtils extends org.apache.commons.lang3.time.DateUtils
{
    public static final String YYYY = "yyyy";

    public static final String YYYY_MM = "yyyy-MM";

    public static final String YYYY_MM_DD = "yyyy-MM-dd";

    public static final String YYYY_MM_DD_HH_MM = "yyyyMMddHHmm";

    public static final String YYYYMMDDHHMMSS = "yyyyMMddHHmmss";

    public static final String YYYY_MM_DD_HH_MM_SS = "yyyy-MM-dd HH:mm:ss";

    public static final String MM_DD_HH_MM = "MM-dd HH:mm";

    private static String[] parsePatterns = {
            "yyyy-MM-dd", "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd HH:mm", "yyyy-MM",
            "yyyy/MM/dd", "yyyy/MM/dd HH:mm:ss", "yyyy/MM/dd HH:mm", "yyyy/MM",
            "yyyy.MM.dd", "yyyy.MM.dd HH:mm:ss", "yyyy.MM.dd HH:mm", "yyyy.MM"};

    /**
     * 获取当前Date型日期
     *
     * @return Date() 当前日期
     */
    public static Date getNowDate()
    {
        return new Date();
    }

    /**
     * 获取当前日期, 默认格式为yyyy-MM-dd
     *
     * @return String
     */
    public static String getDate()
    {
        return dateTimeNow(YYYY_MM_DD);
    }

    public static final String getTime()
    {
        return dateTimeNow(YYYY_MM_DD_HH_MM_SS);
    }

    public static final String getMmTime()
    {
        return dateTimeNow(YYYY_MM_DD_HH_MM);
    }

    public static final String dateTimeNow()
    {
        return dateTimeNow(YYYYMMDDHHMMSS);
    }

    public static final String dateTimeNow(final String format)
    {
        return parseDateToStr(format, new Date());
    }

    public static final String dateTime(final Date date)
    {
        return parseDateToStr(YYYY_MM_DD, date);
    }

    public static final String parseDateToStr(final String format, final Date date)
    {
        return new SimpleDateFormat(format).format(date);
    }

    public static final Date dateTime(final String format, final String ts)
    {
        try
        {
            return new SimpleDateFormat(format).parse(ts);
        }
        catch (ParseException e)
        {
            throw new RuntimeException(e);
        }
    }

    /**
     * 日期路径 即年/月/日 如2018/08/08
     */
    public static final String datePath()
    {
        Date now = new Date();
        return DateFormatUtils.format(now, "yyyy/MM/dd");
    }

    /**
     * 日期路径 即年/月/日 如20180808
     */
    public static final String dateTime()
    {
        Date now = new Date();
        return DateFormatUtils.format(now, "yyyyMMdd");
    }

    /**
     * 日期型字符串转化为日期 格式
     */
    public static Date parseDate(Object str)
    {
        if (str == null)
        {
            return null;
        }
        try
        {
            return parseDate(str.toString(), parsePatterns);
        }
        catch (ParseException e)
        {
            return null;
        }
    }

    /**
     * 获取服务器启动时间
     */
    public static Date getServerStartDate()
    {
        long time = ManagementFactory.getRuntimeMXBean().getStartTime();
        return new Date(time);
    }

    /**
     * 计算两个时间差
     */
    public static String getDatePoor(Date endDate, Date nowDate)
    {
        long nd = 1000 * 24 * 60 * 60;
        long nh = 1000 * 60 * 60;
        long nm = 1000 * 60;
        // long ns = 1000;
        // 获得两个时间的毫秒时间差异
        long diff = endDate.getTime() - nowDate.getTime();
        // 计算差多少天
        long day = diff / nd;
        // 计算差多少小时
        long hour = diff % nd / nh;
        // 计算差多少分钟
        long min = diff % nd % nh / nm;
        // 计算差多少秒//输出结果
        // long sec = diff % nd % nh % nm / ns;
        return day + "天" + hour + "小时" + min + "分钟";
    }

    public static String getFormatDate(String format,Date date) {
        if (null != date) {
            if (StringUtils.isEmpty(format)) {
                format = YYYY_MM_DD_HH_MM_SS;
            }
            String dateStr = parseDateToStr(format, date);
            return dateStr;
        }
        return "";
    }

    /**
     * 秒转小时分
     * @param second
     * @return
     */
    public static String getFormatTime(Long second) {

        if (second != null) {

            if(second < 3600) {//分

                return NumFormat(second / 60) + "分";
            }

            if(second< 3600 * 24) {//时

                return NumFormat(second/ 60 / 60) + "小时" + NumFormat(second/ 60 % 60) + "分";
            }

            if(second>= 3600 * 24) {//天

                return NumFormat(second/ 60 / 60 /24) + "天" +NumFormat(second/ 60 / 60 % 24) + "小时" + NumFormat(second/ 60 % 60) + "分";
            }
        }

        return "--";
    }

    /**
     * 格式化时间
     * @param sec
     * @return
     */
    private static String NumFormat(long sec) {
        if (String.valueOf(sec).length() < 2){
            return "0"+sec;
        }else {
            return String.valueOf(sec);
        }
    }

    /**
     * 获取当前时间前面某天或者后面某天
     * @param date
     * @return
     */
    public static Date getOtherDay(Date date, int amount) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DAY_OF_MONTH,amount);
        Date time = calendar.getTime();
        return time;
    }

    /**
     * 获取当前时间月日 7.13
     * @param date
     * @return
     */
    public static String getMonthDay(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        //month从0开始
        int month = calendar.get(Calendar.MONTH) + 1;
        int day = calendar.get(Calendar.DAY_OF_MONTH);
        return month+"."+day;
    }
    /**
     * 获取周几
     * @param date
     * @return
     */
    public static String getWeek(Date date) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int weekday = calendar.get(Calendar.DAY_OF_WEEK);
        String week = null;
        if (weekday == 1) {
            week = "周日";
        } else if (weekday == 2) {
            week = "周一";
        } else if (weekday == 3) {
            week = "周二";
        } else if (weekday == 4) {
            week = "周三";
        } else if (weekday == 5) {
            week = "周四";
        } else if (weekday == 6) {
            week = "周五";
        } else if (weekday == 7) {
            week = "周六";
        }
        return week;
    }

    /**
     * 根据日期字符串获取时间
     * @param str
     * @return
     */
    public static Date getDate(String str) {
        SimpleDateFormat sdf = new SimpleDateFormat(YYYY_MM_DD);
        Date parse = null;
        try {
            parse = sdf.parse(str);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return parse;
    }
    /**
     * 根据日期字符串获取时间
     * @param format
     * @param str
     * @return
     */
    public static Date getDate(String format,String str) {
        if (StringUtils.isEmpty(format)) {
            format = YYYY_MM_DD_HH_MM_SS;
        }
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        Date parse = null;
        try {
            parse = sdf.parse(str);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return parse;
    }

    /**
     * 格式化日期
     * @param format
     * @param date
     * @return
     */
    public static Date getChangeDate(String format,Date date) {
        if (null != date) {
            if (StringUtils.isEmpty(format)) {
                format = YYYY_MM_DD_HH_MM_SS;
            }
            String dateStr = parseDateToStr(format, date);
            Date resDate = getDate(format, dateStr);
            return resDate;
        }
        return null;
    }

    /**
     * 计算两个日期相差几天，不计算结束日期当天
     * @param start 开始时间
     * @param end 结束时间
     * @return
     */
    public static long getDiffDays(Date start,Date end) {
        long dayNum = 0;
        if (start != null && end != null) {
            //格式化时间
            Date startdate = getChangeDate(YYYY_MM_DD,start);
            Date enddate = getChangeDate(YYYY_MM_DD,end);
            //获取时间差
            long subtract = enddate.getTime() - startdate.getTime();
            //转换为天数
            dayNum = subtract / 1000 / 60 / 60 / 24;
        }
        return dayNum;
    }

    /**
     * 判断是不是本周
     * @param date
     * @return
     */
    public static boolean isThisWeek(Date date) {
        Calendar calendar = Calendar.getInstance();
        int currentWeek = calendar.get(Calendar.WEEK_OF_YEAR);
        calendar.setTime(date);
        int dateWeek = calendar.get(Calendar.WEEK_OF_YEAR);
        if (currentWeek == dateWeek) {
            return true;
        }
        return false;
    }

    /**
     * 判断是否是当天
     * @param date
     * @return
     */
    public static boolean isThisDay (Date date) {
        return isThisTime(date,YYYY_MM_DD);
    }

    /**
     * 判断是否是本月
     * @param date
     * @return
     */
    public static boolean isThisMonth (Date date) {
        return isThisTime(date,YYYY_MM);
    }

    /**
     * 判断当前时间
     * @param date
     * @param format
     * @return
     */
    private static boolean isThisTime(Date date, String format) {
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        String dateFormat = sdf.format(date);
        String nowFormat = sdf.format(new Date());
        if (dateFormat.equals(nowFormat)) {
            return true;
        }
        return false;
    }


}