我有这个代码用于计算月份和时间差异，但此代码提供了错误的输出 它计算3个月甚至实际月差为1，当我测试此代码和时间相同的情况请帮助这个代码中的问题在哪里....
public static void updateLinkDownTimeDate(ObjectId TimeDateId, TimeDatePojo TimeDatePojo) {
try {
List<DBObject> array = new ArrayList<>();
BasicDBObject match = new BasicDBObject();
match.put("_id", TimeDateId);
DBCollection collection = new MongoSetup().getDBCollection("TimeDate");
DBObject obj = TimeDatePojo.bsomFromPojo();
String newId = (String) obj.get("linkId");
SimpleDateFormat dates = new SimpleDateFormat("dd-MM-yyyy");
String startDate = dates.format(obj.get("startDate"));
String endDate = dates.format(obj.get("endDate"));
Date SD = dates.parse(startDate);
Date ED = dates.parse(endDate);
Calendar cal = Calendar.getInstance();
cal.setTime(SD);
int month = cal.get(Calendar.MONTH);
int year = cal.get(Calendar.YEAR);
String startTime = (String) obj.get("startTime"); //present start time
SimpleDateFormat forms = new SimpleDateFormat("dd-MM-yyyy");
SimpleDateFormat form = new SimpleDateFormat("HH:mm:ss");
Calendar currentStartDateCalendar = Calendar.getInstance();
currentStartDateCalendar.setTime(SD);
int currentSDate = currentStartDateCalendar.get(Calendar.DATE);
int currentStartMonth = currentStartDateCalendar.get(Calendar.MONTH);
int currentStartYear = currentStartDateCalendar.get(Calendar.YEAR);
Date STs = form.parse(startTime);
Calendar presentStartTime = Calendar.getInstance();
presentStartTime.setTime(STs);
int currentHour = presentStartTime.get(Calendar.HOUR);
int currentMin = presentStartTime.get(Calendar.MINUTE);
int currentSec = presentStartTime.get(Calendar.SECOND);
currentStartDateCalendar.set(currentStartYear, currentStartMonth, currentSDate, currentHour, currentMin, currentSec);
Date PSDate = currentStartDateCalendar.getTime();
String endTime = (String) obj.get("endTime"); //present end time
Date ETs = form.parse(endTime);
Calendar currentEndDateCalender = Calendar.getInstance();
currentEndDateCalender.setTime(ED);
int currentEDate = currentEndDateCalender.get(Calendar.DATE);
int currentEndMonth = currentEndDateCalender.get(Calendar.MONTH);
int currentEYear = currentEndDateCalender.get(Calendar.YEAR);
Calendar presentEndTime = Calendar.getInstance();
presentEndTime.setTime(ETs);
int currentEndHour = presentEndTime.get(Calendar.HOUR);
int currentEndMin = presentEndTime.get(Calendar.MINUTE);
int currentEndSec = presentEndTime.get(Calendar.SECOND);
currentEndDateCalender.set(currentEYear, currentEndMonth, currentEDate, currentEndHour, currentEndMin, currentEndSec);
Date PEDate = currentEndDateCalender.getTime();
BasicDBObject getSavedDate = new BasicDBObject();
getSavedDate.append("_id", linkDownTimeDateId);
getSavedDate.append("linkId", newId);
DBObject seeSaved = collection.findOne(getSavedDate);
Date savedSDate = (Date) seeSaved.get("startDate");
Date savedEDate = (Date) seeSaved.get("endDate");
String savedStartTime = (String) seeSaved.get("startTime");
String savedEndTime = (String) seeSaved.get("endTime");
Date SSD = null;
Date SED = null;
if (savedSDate.compareTo(SD) == 0 && savedEDate.compareTo(ED) == 0) {
Calendar saveStartTimeCalendar = Calendar.getInstance();
saveStartTimeCalendar.setTime(savedSDate);
int savedYear = saveStartTimeCalendar.get(Calendar.YEAR);
int savedMonth = saveStartTimeCalendar.get(Calendar.MONTH);
int savedDate = saveStartTimeCalendar.get(Calendar.DATE);
Date SSTs = form.parse(savedStartTime);
Calendar savedStartTimeCal = Calendar.getInstance();
savedStartTimeCal.setTime(SSTs);
int hour = savedStartTimeCal.get(Calendar.HOUR);
int mins = savedStartTimeCal.get(Calendar.MINUTE);
int secs = savedStartTimeCal.get(Calendar.SECOND);
saveStartTimeCalendar.set(savedYear, savedMonth, savedDate, hour, mins, secs);
SSD = saveStartTimeCalendar.getTime();
Calendar saveEndTimeCalendar = Calendar.getInstance();
saveStartTimeCalendar.setTime(savedEDate);
int savedEndYear = saveEndTimeCalendar.get(Calendar.YEAR);
int savedEndMonth = saveEndTimeCalendar.get(Calendar.MONTH);
int savedEndDates = saveEndTimeCalendar.get(Calendar.DATE);
Date ESTs = form.parse(savedEndTime);
Calendar savedEndTimeCal = Calendar.getInstance();
savedEndTimeCal.setTime(ESTs);
int endhour = savedStartTimeCal.get(Calendar.HOUR);
int endmins = savedStartTimeCal.get(Calendar.MINUTE);
int endsecs = savedStartTimeCal.get(Calendar.SECOND);
saveEndTimeCalendar.set(savedEndYear, savedEndMonth, savedEndDates, endhour, endmins, endsecs);
SED = saveEndTimeCalendar.getTime();
} else if (savedSDate.compareTo(SD) == -1 || savedEDate.compareTo(ED) == -1) {
Calendar saveStartTimeCalendar = Calendar.getInstance();
saveStartTimeCalendar.setTime(SD);
int savedYear = saveStartTimeCalendar.get(Calendar.YEAR);
int savedMonth = saveStartTimeCalendar.get(Calendar.MONTH);
int savedDate = saveStartTimeCalendar.get(Calendar.DATE);
Date SSTs = form.parse(savedStartTime);
Calendar savedStartTimeCal = Calendar.getInstance();
savedStartTimeCal.setTime(SSTs);
int hour = savedStartTimeCal.get(Calendar.HOUR);
int mins = savedStartTimeCal.get(Calendar.MINUTE);
int secs = savedStartTimeCal.get(Calendar.SECOND);
saveStartTimeCalendar.set(savedYear, savedMonth, savedDate, hour, mins, secs);
SSD = saveStartTimeCalendar.getTime();
Calendar saveEndTimeCalendar = Calendar.getInstance();
saveStartTimeCalendar.setTime(ED);
int savedEndYear = saveEndTimeCalendar.get(Calendar.YEAR);
int savedEndMonth = saveEndTimeCalendar.get(Calendar.MONTH);
int savedEndDates = saveEndTimeCalendar.get(Calendar.DATE);
Date ESTs = form.parse(savedEndTime);
Calendar savedEndTimeCal = Calendar.getInstance();
savedEndTimeCal.setTime(ESTs);
int endhour = savedStartTimeCal.get(Calendar.HOUR);
int endmins = savedStartTimeCal.get(Calendar.MINUTE);
int endsecs = savedStartTimeCal.get(Calendar.SECOND);
saveEndTimeCalendar.set(savedEndYear, savedEndMonth, savedEndDates, endhour, endmins, endsecs);
SED = saveEndTimeCalendar.getTime();
}
List<DBObject> lists = (List<DBObject>) seeSaved.get("linkDownTime");
int down = 0;
for (DBObject dating : lists) {
down = (int) dating.get("downTime"); //saved down time
}
String startHour = "00:00:00";
String endHour = "24:00:00";
long minutesInOneDay = 1440;
int numberOfDays = 0;
long dateDifference = 0l;
int totalCalculatedMins = 0;
try {
dateDifference = ED.getTime() - SD.getTime();
long days = dateDifference / (24 * 60 * 60 * 1000);
numberOfDays = (int) days;
if (numberOfDays == 0) {
int min = (int) minutesInOneDay;
SimpleDateFormat format2 = new SimpleDateFormat("HH:mm:ss");
Date parsedStartTime = format2.parse(startTime);
Date parsedEndTime = format2.parse(endTime);
Date parsedOriginalStartHour = format2.parse(startHour);
Date parsedOriginalEndHour = format2.parse(endHour);
long excludeStartTime = parsedOriginalEndHour.getTime() - parsedStartTime.getTime();
long excludedStartMins = minutesInOneDay - (excludeStartTime / (60 * 1000));
int excludedMins = (int) excludedStartMins;
long excludeEndTime = parsedEndTime.getTime() - parsedOriginalStartHour.getTime();
long excludeEndMins = 1440 - (excludeEndTime / (60 * 1000));
int excludeMins2 = (int) excludeEndMins;
long calculation = min - excludedMins - excludeMins2;
totalCalculatedMins = (int) calculation;
} else {
long minuetes = (minutesInOneDay * numberOfDays);
int min = (int) minuetes;
SimpleDateFormat format2 = new SimpleDateFormat("HH:mm:ss");
Date parsedStartTime = format2.parse(startTime);
Date parsedEndTime = format2.parse(endTime);
Date parsedOriginalStartHour = format2.parse(startHour);
Date parsedOriginalEndHour = format2.parse(endHour);
long excludeStartTime = parsedOriginalEndHour.getTime() - parsedStartTime.getTime();
long excludedStartMins = excludeStartTime / (60 * 1000);
int excludedMins = (int) excludedStartMins;
long excludeEndTime = parsedEndTime.getTime() - parsedOriginalStartHour.getTime();
long excludeEndMins = 1440 + (-(excludeEndTime / (60 * 1000)));
int excludeMins2 = (int) excludeEndMins;
long calculation = min + excludedMins - excludeMins2;
totalCalculatedMins = (int) calculation;
}
} catch (Exception e) {
System.out.println("Exception being :-" + e);
}
DBObject sub = new BasicDBObject();
sub.put("linkId", newId);
sub.put("year", year);
sub.put("month", month);
sub.put("downTime", totalCalculatedMins);
array.add(sub);
obj.put("linkDownTime", array);
BasicDBObject update = new BasicDBObject();
update.put("$set", obj);
collection.update(match, update, true, false);
BasicDBObject newQuery = new BasicDBObject("linkId", obj.get("linkId"))
.append("startDate", obj.get("startDate"))
.append("endDate", obj.get("endDate"));
DBObject findNewQuery = collection.findOne(newQuery);
DBCollection collection2 = new MongoSetup().getDBCollection("linkTotalDownTime");
List<DBObject> list = (List<DBObject>) findNewQuery.get("linkDownTime");
for (DBObject data : list) {
String linkId = (String) data.get("linkId");
int years = (int) data.get("year");
int months = (int) data.get("month");
int downTime = (int) data.get("downTime"); // current downTime
BasicDBObject look = new BasicDBObject();
look.append("linkID", linkId).append("Year", year).append("month", month);
DBObject findData = collection2.findOne(look);
int dataget = (int) findData.get("totaldownTime"); //totaldowntime
int finalValue = 0;
int finalTotalValue = 0;
if (collection2.count() == 1) {
if (PSDate.compareTo(SSD) == 1) {
if (downTime > down) {
finalValue = down - downTime;
finalTotalValue = (int) (dataget - finalValue);
} else if (down > downTime) {
finalValue = down - downTime;
finalTotalValue = (int) (dataget - finalValue);
}
} else if (PSDate.compareTo(SSD) == -1) {
if (downTime > down) {
finalValue = downTime - down;
finalTotalValue = (int) (dataget + finalValue);
} else if (down > downTime) {
finalValue = down - downTime;
finalTotalValue = (int) (dataget + finalValue);
}
} else if (PEDate.compareTo(SED) == 1) {
if (downTime > down) {
finalValue = downTime - down;
finalTotalValue = (int) (dataget + finalValue);
} else if (down > downTime) {
finalValue = down - downTime;
finalTotalValue = (int) (dataget + finalValue);
}
} else if (PEDate.compareTo(SED) == -1) {
if (downTime > down) {
finalValue = downTime - down;
finalTotalValue = (int) (dataget - finalValue);
} else if (down > downTime) {
finalValue = down - downTime;
finalTotalValue = (int) (dataget - finalValue);
}
}
} else if (collection2.count() > 1) {
if (PSDate.compareTo(SSD) == 1) {
if (downTime > down) {
finalValue = downTime - down;
finalTotalValue = (int) (dataget - finalValue);
} else if (down > downTime) {
finalValue = down - downTime;
finalTotalValue = (int) (dataget - finalValue);
}
} else if (PSDate.compareTo(SSD) == -1) {
if (downTime > down) {
finalValue = downTime - down;
finalTotalValue = (int) (dataget + finalValue);
} else if (down > downTime) {
finalValue = down - downTime;
finalTotalValue = (int) (dataget + finalValue);
}
} else if (PEDate.compareTo(SED) == 1) {
if (downTime > down) {
finalValue = downTime - down;
finalTotalValue = (int) (dataget + finalValue);
} else if (down > downTime) {
finalValue = down - downTime;
finalTotalValue = (int) (dataget + finalValue);
}
} else if (PEDate.compareTo(SED) == -1) {
if (downTime > down) {
finalValue = downTime - down;
finalTotalValue = (int) (dataget - finalValue);
} else if (down > downTime) {
finalValue = down - downTime;
finalTotalValue = (int) (dataget - finalValue);
}
}
}
BasicDBObject update_two = new BasicDBObject();
update_two.put("linkID", linkId);
update_two.put("Year", years);
update_two.put("month", months);
update_two.put("totaldownTime", finalTotalValue);
collection2.update(findData, update_two, true, false);
}
System.out.println("Updated Successfully ...");
} catch (Exception ex) {
ex.printStackTrace();
}
}
答案 0 :(得分：1)
请使用JSR-310（称为ThreeTen），它目前是Java的标准。它提供了包含所有必要工具的Duration或ChronoUnit类。
E.g。 ChronoUnit.MONTHS.between()将计算两个月之间的跨度
答案 1 :(得分：-1)
String calculateTime(String strDate) throws ParseException {
String result = "";
SimpleDateFormat dateFormat = new SimpleDateFormat("ddMMHHmm");
Date currDate = new Date();
String date = dateFormat.format(currDate);
currDate = dateFormat.parse(date);
Date postDate = dateFormat.parse(strDate);
//calculate day diff
long timeDiff = currDate.getTime() - postDate.getTime();
long daysDiff = TimeUnit.MILLISECONDS.toDays(timeDiff);
Calendar calendar = GregorianCalendar.getInstance();
calendar.setTime(postDate);
if (daysDiff == 1) {
result = "yesterday";
result = result + " at " + getHour(calendar.get(Calendar.HOUR)) + ":"
+ setPrefix(calendar.get(Calendar.MINUTE))+ " " + getAM_PM(calendar.get(Calendar.AM_PM));
} else if (daysDiff > 1) {
result = calendar.get(Calendar.DATE) + " " + getMonthForInt(calendar.get(Calendar.MONTH));
result = result + " at " + getHour(calendar.get(Calendar.HOUR)) + ":"
+ setPrefix(calendar.get(Calendar.MINUTE)) + " " + getAM_PM(calendar.get(Calendar.AM_PM));
} else {
long minDiff = TimeUnit.MILLISECONDS.toMinutes(timeDiff);
if (minDiff == 0) {
result = "just now";
} else if (minDiff < 60) {
if (minDiff == 1) {
result = minDiff + " min ago";
} else if(minDiff > 1) {
result = minDiff + " mins ago";
}
} else {
long hourDiff = TimeUnit.MILLISECONDS.toHours(timeDiff);
if (hourDiff == 1) {
result = hourDiff + " hr ago";
} else if(hourDiff > 1){
result = hourDiff + " hrs ago";
}
}
}
return result;
}