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JAVA优化连续天数日期的展示

程序员文章站 2022-05-27 20:25:54
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public class ContinuousTimeTest2 {

    public static void main(String[] args) {
        String timeString = "2021-03-01, 2021-01-02, 2021-01-01, 2020-12-27, 2020-12-31, 2020-12-28, 2021-02-28";

        System.out.println("优化连续日期的显示: "+ continuousTime(timeString));
    }

    // 连续时间
    public static String continuousTime(String timeString){
        String[] dateStrings = timeString.split(",");
        // 将日期字符串转换成日期格式
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        // 设置转换的宽松度,即区分闰年
        sdf.setLenient(true);
        Date[] dates = new  Date[dateStrings.length];
        List list = new ArrayList();
        try {
            // 循环将日期字符串转换成日期类
            for(int i = 0; i < dateStrings.length; i++){
                dates[i] = sdf.parse(dateStrings[i]);
            }
            // 排好序后的时间
            Arrays.sort(dates);
            System.out.print("排好序后的时间:");
            for(int i = 0; i < dates.length; i++){
                System.out.print(sdf.format(dates[i]) + ",");
                list.add(dates[i]);
            }

        } catch (ParseException e) {
            e.printStackTrace();
        }
        System.out.println();
//        System.out.println("formDate "+betterSyncTime(list));
//        System.out.println("当前时间:" + sdf.format(new Date()));
        return betterSyncTime(list);
    }

    /**
     * @Author Linliang
     * @Description 优化连续日期的显示
     * @Date 2018/7/19
     * @Param
     */
    static String betterSyncTime(List<Date> list) {
        Date sDate = null;
        Date eDate = null;
        boolean isStart = true;
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < list.size() - 1; i++) {
            if (differentDays(list.get(i), list.get(i+1)) == 1) {
                if (isStart != false) {
                    sDate = list.get(i);
                    isStart = false;
                }
                if(i == (list.size()-2)){
                    eDate = list.get(i+1);
                    sb.append(sdf.format(sDate)).append("~").append(sdf.format(eDate));
                }
            } else {
                if (isStart != true ) {
                    eDate = list.get(i);
                    sb.append(sdf.format(sDate)).append("~").append(sdf.format(eDate)).append(",");
                    isStart = true;
                } else {
                    sb.append(sdf.format(list.get(i))).append(",");
                }
                if(i == (list.size()-2)) {
                    sb.append(sdf.format(list.get(i+1)));
                }
            }
        }
        return sb.toString();
    }


    /**
     * @Author Linliang
     * @Description  计算两个日期相差几天
     * @Date  2018/7/19
     * @Param
     */
    public static int differentDays(Date date1, Date date2) {
        Calendar cal1 = Calendar.getInstance();
        cal1.setTime(date1);
        Calendar cal2 = Calendar.getInstance();
        cal2.setTime(date2);
        int day1 = cal1.get(Calendar.DAY_OF_YEAR);
        int day2 = cal2.get(Calendar.DAY_OF_YEAR);
        int year1 = cal1.get(Calendar.YEAR);
        int year2 = cal2.get(Calendar.YEAR);
        if (year1 != year2)   //同一年
        {
            int timeDistance = 0;
            for (int i = year1; i < year2; i++) {
                if (i % 4 == 0 && i % 100 != 0 || i % 400 == 0)    //闰年
                {
                    timeDistance += 366;
                } else    //不是闰年
                {
                    timeDistance += 365;
                }
            }

            return timeDistance + (day2 - day1);
        } else    //不同年
        {
            return day2 - day1;
        }
    }
}

JAVA优化连续天数日期的展示

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