Java报表填充：查询日期范围内，无数据填充0

版权声明：本文为博主原创文章，转载注明出处。 https://blog.csdn.net/Adonis_D_Gogh/article/details/82180488

填充处理 代码：

/**填充处理*/
        String start = vehicleRecordInfo.getStartTime();
        String end = vehicleRecordInfo.getEndTime();
        try {
            Date date1 = sdf.parse(start);
            Date date2 = sdf.parse(end);
            int daySub = differentDays(date1,date2);   //间隔天数
            List<String> dateList = genDateRange(date1,date2);  //存放连续日期的list
            if(daySub==0){  //间隔天数为0，同一天
                if(list.size()==0){
                    VehicleRecordHour vrh = vrhFilling();    //调用填充数据方法vrhFilling
                    Date dtList = sdf.parse(dateList.get(0));
                    vrh.setStaticsDate(dtList);     //单独set日期
                    list.add(vrh);
                }
            }else {
                final int listSize = list.size();  //填充会改变size，设置为final
                for (int i = 0; i <= daySub; i++) {
                    //如果list为空，直接填充
                    if (listSize == 0) {
                        VehicleRecordHour vrh = vrhFilling();    //调用填充数据方法vrhFilling
                        Date dtList = sdf.parse(dateList.get(i));
                        vrh.setStaticsDate(dtList);     //单独set日期
                        list.add(vrh);
                    }
                    //list不为空，就需要对比
                    for (int j = 0; j < listSize; j++) {
                        Boolean boo;
                        Date sli = list.get(j).getStaticsDate();
                        String reStr = sdf.format(sli);
                        if (!dateList.get(i).equals(reStr)) {   //如果数据库没有该日期dateList.get(i)
                            boo = false;    //没有
                        } else {
                            break;
                        }
                        if (j == listSize - 1 && boo == false) {    //到最后都没有该日期
                            VehicleRecordHour vrh = vrhFilling();    //调用填充数据方法vrhFilling
                            Date dtList = sdf.parse(dateList.get(i));
                            vrh.setStaticsDate(dtList);     //单独set日期
                            list.add(vrh);
                        }
                    }

                }
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
        list.sort(Comparator.comparing(VehicleRecordHour::getStaticsDate));
        PageInfo page = new PageInfo(list);
        return RestResult.success(new PageEntity(page));

 附：

1、指定日期范围获取日期列表

     /**
     * 生成日期区间
     * @param start1 e.g. 2018-08-28 12:00:00
     * @param end1  e.g. 2018-08-30 10:10:00
     * @return [2018-08-28, 2018-08-29, 2018-08-30]
     */
    public static List<String> genDateRange(Date start1, Date end1) {
        DateTime start=new DateTime(start1);
        DateTime end=new DateTime(end1);
        List<String> list = new ArrayList<>();
        if (start.isAfter(end)) {
            return list;
        }

        DateTime _start = new DateTime(start.getYear(), start.getMonthOfYear(), start.getDayOfMonth(), 0, 0, 0);
        DateTime _end = new DateTime(end.getYear(), end.getMonthOfYear(), end.getDayOfMonth(), 0, 0, 0);
        DateTime date = new DateTime(_start);
        while (true) {
            if (!date.isAfter(_end)) {
                list.add(date.toString(CommonUtils.DATE));
                date = date.plusDays(1);
            } else {
                break;
            }
        }
        return list;
    }

2、日期处理，将传来的日期自定义拆分处理

/**
*日期处理，joda-time
*/
Record record = new Record();
        //日期拆分,传入的实体为recordEntity
        if(recordEntity.getRecordTime()!=null) {
            Long recordTime = recordEntity.getRecordTime();
            Date recordDateTime = new Date(recordTime);
            //Date转成Calendar
            Calendar cal = Calendar.getInstance();    
            cal.setTime(recordDateTime);
            int year = cal.get(Calendar.YEAR);
            int month = cal.get(Calendar.MONTH) + 1;    //获取的月份0开始的
            int date = cal.get(Calendar.DATE);
            int hour = cal.get(Calendar.HOUR);
            //joda-time
            Date staticsDate = new DateTime(year, month, date, 0, 0, 0).toDate();
            Date staticsMonth = new DateTime(year, month, 1, 0, 0, 0).toDate();    //值为 Wed Aug 01 00:00:00 CST 2018
            record.setStaticsDate(staticsDate);
            record.setStaticsDate(staticsMonth);
            record.setSnapYear(year);
            record.setSnapMonth(month);
            record.setSnapDate(date);
            record.setSnapHour(hour);
            record.setSnapTime(recordDateTime);
        }

3、两日期间隔天数

    /**
     * 两个时间的间隔天数 joda-time
     * @param date1
     * @param date2
     * @return
     */
    public static int differentDays(Date date1,Date date2)
    {
        LocalDate start=new LocalDate(date1);
        LocalDate end=new LocalDate(date2);
        int days = Days.daysBetween(start, end).getDays();
        return days;
    }