Java日期工具类获取时间列表(一)

获取时间列表

嘚吧嘚

相信很多业务都有各种报表，日报表、月报表、年报表，甚至都有小时、分钟报表😮?💨。
要生成报表最基本的就是时间列表了，每次用的时候都写方法是不可取的，于是就搞了一个日期的工具类😏。
后续也会慢慢完善的😉。

当然了，大家也可以根据我提供的方法按照自己需求进行修改，比如传参、返回值等。

指定时间范围

获取指定时间范围内的每一天

public static List<Date> getAllDatesInRange(Date startDate, Date endDate) {
    List<Date> dates = new ArrayList<>();
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(startDate);
    while (!calendar.getTime().after(endDate)) {
        dates.add(calendar.getTime());
        calendar.add(Calendar.DATE, 1);
    }
    return dates;
}

获取指定时间范围内每月的最后一天

public static List<Date> getLastDaysOfMonthInRange(Date startDate, Date endDate) {
    List<Date> lastDays = new ArrayList<>();
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(startDate);
    while (!calendar.getTime().after(endDate)) {
        calendar.set(Calendar.DATE, calendar.getActualMaximum(Calendar.DATE));
        lastDays.add(calendar.getTime());
        calendar.add(Calendar.MONTH, 1);
    }
    return lastDays;
}

获取指定时间范围内每年的最后一天

public static List<Date> getLastDaysOfYearInRange(Date startDate, Date endDate) {
    List<Date> lastDays = new ArrayList<>();
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(startDate);
    while (!calendar.getTime().after(endDate)) {
        calendar.set(Calendar.DAY_OF_YEAR, calendar.getActualMaximum(Calendar.DAY_OF_YEAR));
        lastDays.add(calendar.getTime());
        calendar.add(Calendar.YEAR, 1);
    }
    return lastDays;
}

指定结束时间

指定结束时间获取过去X天

    public static List<String> getAllDates(int points, Date endDate, SimpleDateFormat format) {
        List<String> timeList = new ArrayList<>();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(endDate);

        for (int i = 0; i < points; i++) {
            calendar.add(Calendar.DATE, -1);
            Date day = calendar.getTime();
            timeList.add(0, format.format(day));
        }
        return timeList;
    }

指定结束时间获取过去X月的最后一天

public static List<String> getMonthLastDay(int points, Date endDate, SimpleDateFormat format) {
    List<String> timeList = new ArrayList<>()
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(endDate);
    for (int i = 0; i < points; i++) {
        calendar.add(Calendar.MONTH, -1);

        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        calendar.set(year, month, calendar.getActualMaximum(Calendar.DAY_OF_MONTH));
        Date lastDayOfMonth = calendar.getTime();

        timeList.add(0, format.format(lastDayOfMonth));
    }
    return timeList;
}

指定结束时间获取过去X年的最后一天

public static List<String> getYearLastDay(int points, Date endDate, SimpleDateFormat format) {
    List<String> timeList = new ArrayList<>();
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(endDate);
    
    for (int i = 0; i < points; i++) {
        calendar.add(Calendar.YEAR, -1);

        int year = calendar.get(Calendar.YEAR);
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, Calendar
        
        Date lastDayOfYear = calendar.getTime();
        timeList.add(0, format.format(lastDayOfYear));
    }
    return timeList;
}

打完收工！！！