java - 循环计算整周并跳过天数

Question

我从两个日期之间的查询中检索更多数据。日期是该月第一周的第一天和该月最后一周的最后一天。准确地说，当前月份(例如)按原样具有范围日期(在区域设置上，星期一是一周的第一天):

from 2014-03-31 to 2014-05-04 (35 days)

问题是，数据检索只是工作日(例如:一周 5 天)，但我必须计算 7 天的整个星期，因为每 7 天我都会在 ArrayList 中写入数据。

我正在构建一个代码来实现此目的，但不起作用，因为该代码只计算 33 天，而不是 35 天，我不明白为什么......

这是我的代码:

DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
    Date firstdayoftheweek = new Date();
    try
    {
    firstdayoftheweek = formatter.parse("2014-03-31");
    }
    catch(ParseException e){}

    String dateTemp = null;

    for ( String[] result : results) // cicle for every query's row
    {

    count_row++;

    if (count_row == 1)
    {
        Date dtActualDayQuery = new Date();
        try
        {
            dtWd = formatter.parse(result[12]);
        }
        catch(ParseException e){}

        int diffDays = Days.daysBetween(new DateTime(firstdayoftheweek), new DateTime(dtActualDayQuery)).getDays();

        if (diffDays > 1)
        {
            count_row = (count_row + diffDays) -1;
        }
    }
    else
    {
        Date dtprevious = new Date();
        Date dtActualDayQuery = new Date();

        try
        {
            dtprevious = formatter.parse(dateTemp);
            dtActualDayQuery = formatter.parse(result[12]);
        }
        catch(ParseException e){}

        int diffDays = Days.daysBetween(new DateTime(dtprevious), new DateTime(dtActualDayQuery)).getDays();

        if (diffDays > 1)
        {
            count_row = (count_row + diffDays) -1;
        }
    }

    dateTemp = result[12]; // Save the date for next comparison

    // Do something every day of the week


    if (((count_row) % 7) == 0)
    {
        // Do something every 7 days
    }
}

不正确，我知道...但我想不出正确的解决方案...

谢谢!!

编辑:

我写了一个示例代码:

package test;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.joda.time.DateTime;
import org.joda.time.Days;

public class Test 
{
    public static void main(String[] args) 
    {
        int count = 0;

        String[] month = {"2014-03-31", "2014-04-01", "2014-04-02", "2014-04-03", "2014-04-04",
                "2014-04-07", "2014-04-08", "2014-04-09", "2014-04-10", "2014-04-11",
                "2014-04-14", "2014-04-15", "2014-04-16", "2014-04-17", "2014-04-18",
                "2014-04-21", "2014-04-22", "2014-04-23", "2014-04-24", "2014-04-25",
                "2014-04-28", "2014-04-29", "2014-04-30", "2014-05-01", "2014-05-02"};

        DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
        Date dt_1day_absolute = new Date();

        try 
        {
            dt_1day_absolute = formatter.parse("2014-03-31");
        } 
        catch (ParseException e) {}

        String dateTemp = null;

        for (int i = 0; i < month.length; i++) 
        {

            count++;

            if (count == 1) 
            {
                Date dtFromVector = new Date();
                try 
                {
                    dtFromVector = formatter.parse(month[i]);
                } catch (ParseException e){}

                int diffDays = Days.daysBetween(new DateTime(dt_1day_absolute), new DateTime(dtFromVector)).getDays();

                if (diffDays > 1) 
                {
                    count = (count + diffDays) - 1;
                }
            } 
            else 
            {
                Date dtprev = new Date();
                Date dtaft = new Date();

                try 
                {
                    dtprev = formatter.parse(dateTemp);
                    dtaft = formatter.parse(month[i]);
                } 
                catch (ParseException e) {}

                int diffDays = Days.daysBetween(new DateTime(dtprev), new DateTime(dtaft)).getDays();

                if (diffDays > 1) 
                {
                    count = (count + diffDays) - 1;
                }
            }

            dateTemp = month[i];

            System.out.println("Num Day: " + String.valueOf(count));
            System.out.println("Date: " + month[i]);

            if (((count) % 7) == 0) 
            {
                System.out.println("---End week---");
                System.out.println("");
            }

        }
    }

}

我得到这个结果:

Num Day:  1
Date:  2014-03-31
Num Day:  2
Date:  2014-04-01
Num Day:  3
Date:  2014-04-02
Num Day:  4
Date:  2014-04-03
Num Day:  5
Date:  2014-04-04
Num Day:  8
Date:  2014-04-07
Num Day:  9
Date:  2014-04-08
Num Day:  10
Date:  2014-04-09
Num Day:  11
Date:  2014-04-10
Num Day:  12
Date:  2014-04-11
Num Day:  15
Date:  2014-04-14
Num Day:  16
Date:  2014-04-15
Num Day:  17
Date:  2014-04-16
Num Day:  18
Date:  2014-04-17
Num Day:  19
Date:  2014-04-18
Num Day:  22
Date:  2014-04-21
Num Day:  23
Date:  2014-04-22
Num Day:  24
Date:  2014-04-23
Num Day:  25
Date:  2014-04-24
Num Day:  26
Date:  2014-04-25
Num Day:  29
Date:  2014-04-28
Num Day:  30
Date:  2014-04-29
Num Day:  31
Date:  2014-04-30
Num Day:  32
Date:  2014-05-01
Num Day:  33
Date:  2014-05-02

我期望这个结果:

Num Day:  1
Date:  2014-03-31
Num Day:  2
Date:  2014-04-01
Num Day:  3
Date:  2014-04-02
Num Day:  4
Date:  2014-04-03
Num Day:  5
Date:  2014-04-04
Num Day:  6
not exists
Num Day:  7
not exists
---End week---
Num Day:  8
Date:  2014-04-07
Num Day:  9
Date:  2014-04-08
Num Day:  10
Date:  2014-04-09
Num Day:  11
Date:  2014-04-10
Num Day:  12
Date:  2014-04-11
Num Day:  13
not exists
Num Day:  14
not exists
---End week---
Num Day:  15
Date:  2014-04-14
Num Day:  16
Date:  2014-04-15
Num Day:  17
Date:  2014-04-16
Num Day:  18
Date:  2014-04-17
Num Day:  19
Date:  2014-04-18
Num Day:  20
not exists
Num Day:  21
not exists
---End week---
Num Day:  22
Date:  2014-04-21
Num Day:  23
Date:  2014-04-22
Num Day:  24
Date:  2014-04-23
Num Day:  25
Date:  2014-04-24
Num Day:  26
Date:  2014-04-25
Num Day:  27
not exists
Num Day:  28
not exists
---End week---
Num Day:  29
Date:  2014-04-28
Num Day:  30
Date:  2014-04-29
Num Day:  31
Date:  2014-04-30
Num Day:  32
Date:  2014-05-01
Num Day:  33
Date:  2014-05-02
Num Day:  34
not exists
Num Day:  35
not exists
---End week---

Answer 1

下一个解决方案应该会有帮助:

final DateTimeFormatter dtf = DateTimeFormat.forPattern("yyyy-MM-dd"); // like 'SimleDateFormat'
final List<String> month = Arrays.asList("2014-03-31", "2014-04-01", "2014-04-02", "2014-04-03", "2014-04-04",
          "2014-04-07", "2014-04-08", "2014-04-09", "2014-04-10", "2014-04-11",
          "2014-04-14", "2014-04-15", "2014-04-16", "2014-04-17", "2014-04-18",
          "2014-04-21", "2014-04-22", "2014-04-23", "2014-04-24", "2014-04-25",
          "2014-04-28", "2014-04-29", "2014-04-30", "2014-05-01", "2014-05-02");
final DateTime lastDate = dtf.parseDateTime(month.get(month.size() - 1)); // last date in 'month' array
final MutableDateTime dateIterator = new MutableDateTime(dtf.parseDateTime(month.get(0))); // first date in 'month' array
int count = 0;
for (;;dateIterator.addDays(1)) // start iteration day by day 
{
   count++;
   final String dateAsString = dtf.print(dateIterator); // convert iterator to String
   if (month.contains(dateAsString)) // 'month' array contains current date
   {
      System.out.println("Date: " + dateAsString);
   }
   else
   {  
      if (dateIterator.getDayOfWeek() == 1   // current date is first day of week but record is absent in db
          && dateIterator.isAfter(lastDate)) // and all records from db are processed
                                             // so let's break for-loop

      {
         break; // break for-loop
      }   
      System.out.println("not exists");
   }
   System.out.println("Num Day: " + String.valueOf(count));
}