Java-比对两个Date时间的间隔

两个时间: [2018-10-01,2018-10-05)
时间间隔: 4
输出时间:
  Mon Oct 01 00:00:00 CST 2018
  Tue Oct 02 00:00:00 CST 2018
  Wed Oct 03 00:00:00 CST 2018
  Thu Oct 04 00:00:00 CST 2018

package hrt.executor.test;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
public class DateBetweenTest {
    public static void main(String[] args) throws ParseException {
        Calendar compareDay = new GregorianCalendar();
        //Calendar compareDay = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        String startStr = "2018-10-01";
        String endStr = "2018-10-05";
        Date startDate = sdf.parse(startStr);
        Date endDate = sdf.parse(endStr);
        int differentDays = differentDays(startDate, endDate);
        System.out.println(startStr + " ~ " + endStr + " ,间隔天数为" + differentDays);
        for (int i = 0; i < differentDays; i++) {
            compareDay.setTime(startDate);
            compareDay.add(compareDay.DATE, i);
            System.out.println(compareDay.getTime());
        }
    }
    /**
     * date2比date1多的天数:比较是基于年月日做的比较,不计算时分秒
     * 
     * @param date1
     * @param date2
     * @return
     */
    public static int differentDays(Date date1, Date date2) {
        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(date1);
        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(date2);
        int day1 = cal1.get(Calendar.DAY_OF_YEAR);
        int day2 = cal2.get(Calendar.DAY_OF_YEAR);
        int year1 = cal1.get(Calendar.YEAR);
        int year2 = cal2.get(Calendar.YEAR);
        if (year1 != year2) // 不同年
        {
            int timeDistance = 0;
            for (int i = year1; i < year2; i++) {
                if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0) // 闰年
                {
                    timeDistance += 366;
                } else // 不是闰年
                {
                    timeDistance += 365;
                }
            }
            return timeDistance + (day2 - day1);
        } else // 同一年
        {
            // System.out.println("判断day2 - day1 : " + (day2-day1));
            return day2 - day1;
        }
    }
}