java - 如何获取给定日期范围内的日期列表？

Question

我正在尝试获取 iso 格式(“yyyy-MM-dd”)的日期范围内的日期列表，如下所示:

ArrayList<String> datesList = new ArrayList<String>();
try {
    SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd");
    int[] fromDateParts = new int[3];
    for (int f = 0; f < fromIsoDate.split("-").length; f++) {
        fromDateParts[f] = Integer.parseInt(fromIsoDate.split("-")[f]);
        System.out.println("fromDateParts[" + f + "] : " + fromDateParts[f]);
    }
    int[] toDateParts = new int[3];
    for (int t = 0; t < toIsoDate.split("-").length; t++) {
        toDateParts[t] = Integer.parseInt(toIsoDate.split("-")[t]);
        System.out.println("toDateParts[" + t + "] : " + toDateParts[t]);
    }
    Calendar fromDate = new GregorianCalendar(fromDateParts[0], fromDateParts[1], fromDateParts[2]);
    Calendar toDate = new GregorianCalendar(toDateParts[0], toDateParts[1], toDateParts[2]);
    System.out.println("fromDate " + fromDate + " toDate " + toDate);
    boolean hasMoreDays = true;
    while (hasMoreDays) {
        if ((fromDate.before(toDate)) || (fromDate.equals(toDate))) {
            datesList.add(isoFormat.format(fromDate));
            fromDate.add(Calendar.DAY_OF_MONTH, 1);
        } else {
            hasMoreDays = false;
        }
    }
} catch (Exception e) {
    e.printStackTrace();
    System.out.println("Exception : While determining the dates in between " + fromIsoDate + " and " + toIsoDate + "!");
}

但是，它会抛出错误:
java.lang.IllegalArgumentException:无法将给定对象格式化为日期。

请指导我获取日期范围内的日期列表!

Answer 1

只需将您的开始日期包含在日历中并使用它即可:

Date startDate;
Date endDate;

Calendar c = Calendar.getInstance(); 
c.setTime(startDate); 
Date dt = startDate;
List<Date> dates = new ArrayList<>();

do {
    dates.add(dt);
    c.add(Calendar.DATE, 1);
    dt = c.getTime();
} while (endDate.getTime() > dt.getTime());

正如您所期望听到的那样，Java 8 API 或可能的 JodaTime 可能会让您的生活比使用 Java 7 日期方式更轻松。