在jodatime计算一个月的周数

Question

在乔达蒂姆能计算一个月的周数吗？

我需要这样的东西：

月:7月

• 27周；1-7周。七月
• 28周；9-14周。七月
• 29周；16-21周。七月
• 30周；23-31周。七月

月:8月

• 第31周；第1-4周。8月
• 32周；6-11周。8月
• 33周；13-18周。8月
• 34周；20-25周。8月
• 35周；27-31周。8月

我知道在乔达时间，我可以得到这样的一年中的一周：

new LocalDate().weekOfWeekYear()

但我不知道如何得到相关的日期。

Answer 1

要检索一周的范围，只需创建一个指向一周的第一天和最后一天的对象，然后从其中提取月份的日期。

int weekOfYear = 32;

LocalDate firstDay = new LocalDate().withWeekOfWeekyear(weekOfYear).withDayOfWeek(1);
LocalDate lastDay = new LocalDate().withWeekOfWeekyear(weekOfYear).withDayOfWeek(7);

System.out.println("Week of Year "+weekOfYear+"; "+firstDay.toString("d MMM")+" - "+lastDay.toString("d MMM"));

您还可以提取这样的一天：

int weekStart = firstDay.getDayOfMonth();
int weekEnd = lastDay.getDayOfMonth();

然后，您也可以使用同样的技术来检索一个月中的几个星期。

int firstWeekInMonth = new LocalDate().withMonthOfYear(month).withDayOfMonth(1).getWeekOfYear();
int lastWeekInMonth = new LocalDate().withMonthOfYear(month).dayOfMonth().withMaximalValue().getWeekOfYear();

也许你想把开始日期和结束日期限制在这个月的范围内，否则你可能会得到类似“30-5九月”之类的东西。

Answer 2

修正一些变量：

int weekOfYear = 32;

LocalDate firstDay = new LocalDate().withWeekOfWeekyear(weekOfYear).withDayOfWeek(1);
LocalDate lastDay = new LocalDate().withWeekOfWeekyear(weekOfYear).withDayOfWeek(6);

int weekStart = firstDay.getDayOfMonth();    
int weekEnd = lastDay.getDayOfMonth();

System.out.println("Week of Year "+weekOfYear+"; "+weekStart+"-"+weekEnd+" "+month);

Answer 3

我的解决方案，考虑到其他的答案

 public List<Pair<LocalDate, LocalDate>> getWeeksInMonth(LocalDate data) {

        int firstWeekInMonth = data.withDayOfMonth(1).getWeekOfWeekyear();
        int lastWeekInMonth = data.dayOfMonth().withMaximumValue().getWeekOfWeekyear();

        List<Pair<LocalDate, LocalDate>> weeks = new cicero.minhasfinancas.util.array.ArrayList<>();
        while (firstWeekInMonth <= lastWeekInMonth) {

            LocalDate firstDay = new LocalDate().withWeekOfWeekyear(firstWeekInMonth).withDayOfWeek(1);
            LocalDate lastDay = new LocalDate().withWeekOfWeekyear(firstWeekInMonth).withDayOfWeek(7);
            weeks.add(new Pair<>(firstDay, lastDay));
            firstWeekInMonth++;
        }

        return weeks;
    }

    public class Pair<V1, V2>{

        V1 first;
        V2 second;

        public Pair(V1 first, V2 second) {
            this.first = first;
            this.second = second;
        }

        public V1 getFirst() {
            return first;
        }

        public void setFirst(V1 first) {
            this.first = first;
        }

        public V2 getSecond() {
            return second;
        }

        public void setSecond(V2 second) {
            this.second = second;
        }
    }