java - 将日历日期转换为LocalDate

Question

我决定从5.5升级到Optaplanner 7.5 Nurseroster，但遇到了许多愚蠢的问题。下面是一个。我以前使用的例程如下。现在，新版本需要LocalDate。我有一个MySql数据库后端，用户通过日历选择花名册计划计划器。任何建议将不胜感激。

int shiftDateSize = maxDayIndex + 1;
        List<ShiftDate> shiftDateList = new ArrayList<ShiftDate>(shiftDateSize);
        //shiftDateMap = new HashMap<String, ShiftDate>(shiftDateSize);
        long id = 0L;
        int dayIndex = 0;
        calendar.setTime(startDate);
        for (int i = 0; i < shiftDateSize; i++) {
            ShiftDate shiftDate = new ShiftDate();
            shiftDate.setId(id);
            shiftDate.setDayIndex(dayIndex);
            **String dateString = dateFormat.format(calendar.getTime());**
            shiftDate.setDateString(dateString);
            **shiftDate.setDayOfWeek(DayOfWeek.valueOfCalendar(calendar.get(Calendar.DAY_OF_WEEK)));**
            shiftDate.setShiftList(new ArrayList<Shift>());
            shiftDateList.add(shiftDate);
            shiftDateMap.put(dateString, shiftDate);
            id++;
            dayIndex++;
            calendar.add(Calendar.DAY_OF_YEAR, 1);
        }
        nurseRoster.setShiftDateList(shiftDateList);
    } 

Answer 1

我已经尝试使用以下代码从日历中获取 LocalDate

Calendar calendar = Calendar.getInstance();
TimeZone tz = calendar.getTimeZone();
ZoneId zid = tz == null ? ZoneId.systemDefault() : tz.toZoneId();
LocalDate localDate = LocalDateTime.ofInstant(calendar.toInstant(), zid).LocalDate();

或简单地一行:

LocalDate localDate = LocalDateTime.ofInstant(calendar.toInstant(), calendar.getTimeZone().toZoneId()).toLocalDate();

我从此链接 Convert Calendar to LocalDateTime遵循了这些步骤