可以获取一年的日期

如何解决可以获取一年的日期

我有一张表，希望将每一行都表示为一个日期，并希望将其他一些列表示为该特定日期的特征。因此，基本上我一年将有365行。我需要用Java编写一个批处理作业，该作业将通过其余端点触发。我将特定年份传递给控制器（例如2020年）。然后，我想要一种方法，该方法可以使我在2020年的所有366天（因为2020年是leap年）以及周末（周六/周日）或工作日（周一至周五）这几天。

稍后，我将批量插入这366天的数据库中。

有人可以帮我写这个实用程序方法吗？

解决方法

要接收给定年份的日期列表，可以使用java.time创建类似于以下方法的方法：

public static List<LocalDate> getDaysOfYear(int year) {
    // initialize a list of LocalDate
    List<LocalDate> yearDates = new ArrayList<>();
    /*
     * create a year object from the argument
     * to reliably get the amount of days that year has
     */
    Year thatYear = Year.of(year);
    // then just add a LocalDate per day of that year to the list
    for (int dayOfYear = 1; dayOfYear <= thatYear.length(); dayOfYear++) {
        yearDates.add(LocalDate.ofYearDay(year,dayOfYear));
    }
    // and return the list
    return yearDates;
}

您可以使用结果来提取有关每天的信息（例如，以main为例）

public static void main(String[] args) {
    // receive the LocalDates of a given year
    List<LocalDate> yearDates = getDaysOfYear(2020);
    // define a locale for output (language,formats and so on)
    Locale localeToBeUsed = Locale.US;
    
    // then extract information about each date
    for (LocalDate date : yearDates) {
        // or extract the desired parts,like the day of week
        DayOfWeek dayOfWeek = date.getDayOfWeek();
        // the month
        Month month = date.getMonth();
        // the calendar week based on a locale (the one of your system here)
        WeekFields weekFields = WeekFields.of(localeToBeUsed);
        int calendarWeek = date.get(weekFields.weekOfWeekBasedYear());
        // and print the concatenated information (formatted,depending on the locale)
        System.out.println(date.format(DateTimeFormatter.ofPattern("uuuu-MM-dd",localeToBeUsed))
                + "," + dayOfWeek.getDisplayName(TextStyle.FULL,localeToBeUsed)
                + ",CW " + calendarWeek
                + "," + month.getDisplayName(TextStyle.FULL,localeToBeUsed));
    }
}

输出看起来像这样（为简洁起见，仅几行）：

2020-01-01,Wednesday,CW 1,January
...
2020-02-29,Saturday,CW 9,February
...
2020-05-08,Friday,CW 19,May
...
2020-12-31,Thursday,December