java 获取两个时间之前所有的日期

正序（2017-01-01 ~2019-xxxxx）

 package com.founder.util;

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

 /**
  * TODO
  *
  * @ClassName: Time
  * @author: dh
  * @since: 2019/9/25 15:32
  */
 public class Time {

     /**
      * 返回两个时间间隔内的所有日期
      *
      * @param dateStart eg：2017-1-1
      * @param dateEnd   eg:2019-9-25
      * @return java.util.List<java.lang.String>
      * @Title: getTwoDaysDay
      */

     public static List<String> getTwoDaysDay(String dateStart, String dateEnd) {
         SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

         List<String> dateList = new ArrayList<String>();

         try {
             Date dateOne = sdf.parse(dateStart);
             Date dateTwo = sdf.parse(dateEnd);

             Calendar calendar = Calendar.getInstance();
             calendar.setTime(dateOne);

             dateList.add(sdf.format(dateOne));
             while (calendar.getTime().before(dateTwo)) {
                 calendar.add(Calendar.DAY_OF_MONTH, +1);
                 dateList.add(sdf.format(calendar.getTime()));
             }
         } catch (Exception e) {
             e.printStackTrace();
         }
         return dateList;
     }
 }

倒序（2019-2-25 ~2017-01-01）：

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

/**
 * TODO
 *
 * @ClassName: test
 * @author: dh
 * @since: 2019/9/25 10:21
 */
public class test {

    public static void main(String[] args) {

        Date date = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String format = sdf.format(date);

        System.err.println(getTwoDaysDay("2017-1-1", format));
    }

    public static List<String> getTwoDaysDay(String dateStart, String dateEnd) {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

        List<String> dateList = new ArrayList<String>();

        try {
            Date dateOne = sdf.parse(dateStart);
            Date dateTwo = sdf.parse(dateEnd);

            Calendar calendar = Calendar.getInstance();
            calendar.setTime(dateTwo);

            dateList.add(dateEnd);
            while (calendar.getTime().after(dateOne)) {
                calendar.add(Calendar.DAY_OF_MONTH, -1);
                dateList.add(sdf.format(calendar.getTime()));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dateList;
    }
}