一个小警告。我没有测试过这个呢，但看着的API文档
WeekFields和
LocalDate.get，你应该这样做：
LocalDate date = ...;// Or use a specific locale, or configure your own rulesWeekFields weekFields = WeekFields.of(Locale.getDefault()); int weekNumber = date.get(weekFields.weekOfWeekbasedYear());
