4dkankan-take-look/src/main/java/com/fdkankan/tk/util/Dateutils.java

package com.fdkankan.tk.util;

import cn.hutool.core.date.DateTime;
import cn.hutool.core.date.DateUnit;
import cn.hutool.core.date.DateUtil;
import org.apache.commons.lang3.StringUtils;

import java.text.SimpleDateFormat;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;

public class Dateutils {

    public static int  DAY =  Calendar.DAY_OF_MONTH;
    public static int  WEEK =  Calendar.WEEK_OF_MONTH;
    public static int  MONTH =  Calendar.MONTH;

    /**
     * 获取指定时间区间的所有数据（包含日期和月份）
     * @param dBegin
     * @param dEnd
     * @param rule 日历规则 如：Calendar.DAY_OF_MONTH
     * @return
     */
    public static List<Date> findDates(Date dBegin, Date dEnd, int rule) {
        List<Date> lDate = new ArrayList<>();
        if (dEnd.before(dBegin)){
            return lDate;
        }
        Calendar calBegin = Calendar.getInstance();
        // 使用给定的 Date 设置此 Calendar 的时间
        calBegin.setTime(dBegin);
        Calendar calEnd = Calendar.getInstance();
        // 使用给定的 Date 设置此 Calendar 的时间
        calEnd.setTime(dEnd);
        // 测试此日期是否在指定日期之后
        while (dEnd.after(calBegin.getTime())) {
            // 根据日历的规则，为给定的日历字段添加或减去指定的时间量
            Date time = calBegin.getTime();
            if(rule == Calendar.WEEK_OF_MONTH){
                time = getMonday(time);
            }
            lDate.add(time);
            calBegin.add(rule, 1);
        }
        return lDate;
    }
    public static List<String> findDatesStr(Date dBegin, Date dEnd, int rule) {
        List<String> datesStr = new ArrayList<>();
        List<Date> dates = findDates(dBegin, dEnd, rule);
        for (Date date : dates) {
            String day ;
            if(rule == MONTH){
                day =getMonthDate(date);
            }else {
                day = getDayDate(date);
            }
            datesStr.add(day);
        }
        return datesStr;
    }
    public static Date getDate(String date) {
        try {
            return new SimpleDateFormat("yyyy-MM-dd").parse(date);
        }catch (Exception e){
            e.printStackTrace();
        }
        return new Date();
    }
    public static Date getDateTime(String date) {
        try {
            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(date);
        }catch (Exception e){
            e.printStackTrace();
        }
        return new Date();
    }
    public static Date getMonday(Date date) {
        Calendar calBegin = Calendar.getInstance();
        calBegin.setTime(date);
        calBegin.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);    //周一
        return calBegin.getTime();
    }

    public static String getDate(Date date) {
        return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(date);
    }
    public static String getDateDay(Date date) {
        return new SimpleDateFormat("yyyy-MM-dd").format(date);
    }
    public static String getDateN(Date date) {
        return new SimpleDateFormat("yyyyMMddHHmmss").format(date);
    }

    public static String getMonthDate(Date date) {
        return new SimpleDateFormat("yyyy-MM").format(date);
    }
    public static Date getMonthDate(String date) {
        try {
            return new SimpleDateFormat("yyyy-MM").parse(date);
        }catch (Exception e){
            e.printStackTrace();
        }
        return new Date();
    }

    public static String getDayDate(Date date) {
        return new SimpleDateFormat("yyyy-MM-dd").format(date);
    }
    public static String getDayZeroDate(Date date) {
        return new SimpleDateFormat("yyyy-MM-dd").format(date) +" 00:00:00";
    }


    public static String getHalfYearStr() {
        return new SimpleDateFormat("yyyy-MM-dd").format(getHalfYear())+" 00:00:00";
    }
    public static String getHalfYearStrDay() {
        return new SimpleDateFormat("yyyy-MM-dd").format(getHalfYear());
    }
    public static Date getHalfYear() {
        Calendar c = Calendar.getInstance();
        c.setTime(new Date());
        c.add(Calendar.MONTH, -6);
        return c.getTime();
    }

    public static  String getLastMonTh(Date date){
        Calendar ca = Calendar.getInstance();
        ca.setTime(date);
        ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH));
        return new SimpleDateFormat("yyyy-MM-dd").format(ca.getTime()) +" 23:59:59";
    }


    public static String formatStartTime(String startTime) {
        if(StringUtils.isBlank(startTime)){
            startTime = Dateutils.getHalfYearStr();
        }
        return startTime;
    }
    public static String formatEndTime(String endTime) {
        if(StringUtils.isBlank(endTime)){
            endTime = Dateutils.getDate(new Date());
        }
       return endTime;
    }

    public static String formatStartTimeDay(String startTime) {
        if(StringUtils.isBlank(startTime)){
            return Dateutils.getHalfYearStrDay();
        }
        Date date = getDateTime(startTime);

        return Dateutils.getDateDay(date);
    }
    public static String formatEndTimeDay(String endTime) {
        if(StringUtils.isBlank(endTime)){
           return Dateutils.getDateDay(new Date());
        }

        Date date = getDateTime(endTime);

        return Dateutils.getDateDay(date);
    }


    public static Long getLongTime(Date useStartTime, Date useEndTime,DateUnit dateUnit) {
        if(useStartTime == null || useEndTime ==  null){
            return 0L;
        }
       return DateUtil.between(useStartTime, useEndTime, dateUnit);
    }

}