如何从日历java获取下一个七天的日期 [英] How to get dates for next seven days from calendar java

问题描述

所以，我有一个应用程序，用户可以选择一个日期。

So, I have an application where user can select a date .

他可以选择的最大日期距当前日期还有7天以上。

The maximum date that he can select is upto 7 more days from the current date.

现在，我只显示当前月份的日历。如果目前的日期是7月30日，那么用户必须提供一个选项来选择日期，直到8月6日，我也要处理年度变化的情况，即12月30日，15是当前日期，+7天提供1月6日，16日

以下是我用来获取当月的所有日子的代码。我应该怎么做才能使其适用于上述情况。

Below is the code that I am using to get all the days of current month. What should I do to get it work for the above scenario.

注意：我总是有当前的日期。

Note: I always have the current date available.

代码： / p>

Code:

   public class Cals {

        public static void main(String args[])
        {
            Calendar start = Calendar.getInstance();
            start.set(Calendar.DAY_OF_MONTH, Calendar.getInstance()
                    .getActualMinimum(Calendar.DAY_OF_MONTH));
            Calendar end = Calendar.getInstance();
            end.set(Calendar.DAY_OF_MONTH,
                    Calendar.getInstance().getActualMaximum(Calendar.DAY_OF_MONTH));
            Calendar now = Calendar.getInstance();
            SimpleDateFormat sdf = new SimpleDateFormat("EEE d MMM");

            for (Date dt = start.getTime(); !start.after(end); start.add(
                    Calendar.DATE, 1), dt = start.getTime()) {

                System.out.println(sdf.format(dt));
            }
        }
    }

当前O / p：

Wed 1 Jul
Thu 2 Jul
Fri 3 Jul
Sat 4 Jul
Sun 5 Jul
Mon 6 Jul
Tue 7 Jul
Wed 8 Jul
Thu 9 Jul
Fri 10 Jul
Sat 11 Jul
Sun 12 Jul
Mon 13 Jul
Tue 14 Jul
Wed 15 Jul
Thu 16 Jul
Fri 17 Jul
Sat 18 Jul
Sun 19 Jul
Mon 20 Jul
Tue 21 Jul
Wed 22 Jul
Thu 23 Jul
Fri 24 Jul
Sat 25 Jul
Sun 26 Jul
Mon 27 Jul
Tue 28 Jul
Wed 29 Jul
Thu 30 Jul
Fri 31 Jul

预期O / p：

Wed 1 Jul
Thu 2 Jul
Fri 3 Jul
Sat 4 Jul
Sun 5 Jul
Mon 6 Jul
Tue 7 Jul
Wed 8 Jul
Thu 9 Jul
Fri 10 Jul
Sat 11 Jul
Sun 12 Jul
Mon 13 Jul
Tue 14 Jul
Wed 15 Jul
Thu 16 Jul
Fri 17 Jul
Sat 18 Jul
Sun 19 Jul
Mon 20 Jul
Tue 21 Jul
Wed 22 Jul
Thu 23 Jul
Fri 24 Jul
Sat 25 Jul
Sun 26 Jul
Mon 27 Jul
Tue 28 Jul
Wed 29 Jul
Thu 30 Jul
Fri 31 Jul
Sat 1 Aug
Sun 2 Aug
Mon 3 Aug
Tue 4 Aug
Wed 5 Aug
Thu 6 Aug

推荐答案

只需在结束时添加7天 日历 / p>

Simply add 7 days to the end Calendar

Calendar end = Calendar.getInstance();
end.set(Calendar.DAY_OF_MONTH,
                Calendar.getInstance().getActualMaximum(Calendar.DAY_OF_MONTH));
end.add(Calendar.DATE, 7);

日历将自动处理翻转

新输出...

Wed 1 Jul
Thu 2 Jul
Fri 3 Jul
Sat 4 Jul
Sun 5 Jul
Mon 6 Jul
Tue 7 Jul
Wed 8 Jul
Thu 9 Jul
Fri 10 Jul
Sat 11 Jul
Sun 12 Jul
Mon 13 Jul
Tue 14 Jul
Wed 15 Jul
Thu 16 Jul
Fri 17 Jul
Sat 18 Jul
Sun 19 Jul
Mon 20 Jul
Tue 21 Jul
Wed 22 Jul
Thu 23 Jul
Fri 24 Jul
Sat 25 Jul
Sun 26 Jul
Mon 27 Jul
Tue 28 Jul
Wed 29 Jul
Thu 30 Jul
Fri 31 Jul
Sat 1 Aug
Sun 2 Aug
Mon 3 Aug
Tue 4 Aug
Wed 5 Aug
Thu 6 Aug
Fri 7 Aug

日历能够处理年度翻转，例如...

Calendar is capable of handling the year rollover as well, for example...

Calendar start = Calendar.getInstance();
start.set(2015, Calendar.DECEMBER, 25);
start.set(Calendar.DAY_OF_MONTH, Calendar.getInstance()
                .getActualMinimum(Calendar.DAY_OF_MONTH));
Calendar end = Calendar.getInstance();
end.setTime(start.getTime());
end.set(Calendar.DAY_OF_MONTH,
                Calendar.getInstance().getActualMaximum(Calendar.DAY_OF_MONTH));
end.add(Calendar.DATE, 7);

Calendar now = Calendar.getInstance();
SimpleDateFormat sdf = new SimpleDateFormat("EEE d MMM yyyy");

for (Date dt = start.getTime(); !start.after(end); start.add(
                Calendar.DATE, 1), dt = start.getTime()) {

    System.out.println(sdf.format(dt));
}

这里，我将开始日期设置为12月，输出现在...

Here, I've set the start date to December and the output is now...

Tue 1 Dec 2015
Wed 2 Dec 2015
Thu 3 Dec 2015
Fri 4 Dec 2015
Sat 5 Dec 2015
Sun 6 Dec 2015
Mon 7 Dec 2015
Tue 8 Dec 2015
Wed 9 Dec 2015
Thu 10 Dec 2015
Fri 11 Dec 2015
Sat 12 Dec 2015
Sun 13 Dec 2015
Mon 14 Dec 2015
Tue 15 Dec 2015
Wed 16 Dec 2015
Thu 17 Dec 2015
Fri 18 Dec 2015
Sat 19 Dec 2015
Sun 20 Dec 2015
Mon 21 Dec 2015
Tue 22 Dec 2015
Wed 23 Dec 2015
Thu 24 Dec 2015
Fri 25 Dec 2015
Sat 26 Dec 2015
Sun 27 Dec 2015
Mon 28 Dec 2015
Tue 29 Dec 2015
Wed 30 Dec 2015
Thu 31 Dec 2015
Fri 1 Jan 2016
Sat 2 Jan 2016
Sun 3 Jan 2016
Mon 4 Jan 2016
Tue 5 Jan 2016
Wed 6 Jan 2016
Thu 7 Jan 2016

欢迎来到2016：）

我也会遇到请您使用Java 8的Time API或Joda-Time超过日历

I'd also encourage you to use Java 8's Time API or Joda-Time over Calendar

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