Calendar使用--> 获取星期几、一周日期的函数， calendar.add(Calendar.DATE, 1);日期加1

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最新推荐文章于 2023-07-20 13:48:42 发布

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本文提供了一种方法来获取当前日期对应的星期信息以及整周的日期详情。通过利用Java中的Calendar类，可以方便地实现这些功能。

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Calendar使用--> 获取星期几、一周日期的函数

一、获取星期几：

private String getWeekDay(Calendar c){
   if(c == null){
    return "星期一";
   }

   if(Calendar.MONDAY == c.get(Calendar.DAY_OF_WEEK)){
    return "星期一";
   }
   if(Calendar.TUESDAY == c.get(Calendar.DAY_OF_WEEK)){
    return "星期二";
   }
   if(Calendar.WEDNESDAY == c.get(Calendar.DAY_OF_WEEK)){
    return "星期三";
   }
   if(Calendar.THURSDAY == c.get(Calendar.DAY_OF_WEEK)){
    return "星期四";
   }
   if(Calendar.FRIDAY == c.get(Calendar.DAY_OF_WEEK)){
    return "星期五";
   }
   if(Calendar.SATURDAY == c.get(Calendar.DAY_OF_WEEK)){
    return "星期六";
   }
   if(Calendar.SUNDAY == c.get(Calendar.DAY_OF_WEEK)){
    return "星期日";
   }

   return "星期一";
}

二、一周日期的函数：通过在本周的星期一的Calendar上连续加1，获取一周的日期

//（1）获得当前日期与本周一相差的天数
    private int getMondayPlus() {
        Calendar cd = Calendar.getInstance();
        // 获得今天是一周的第几天，星期日是第一天，星期二是第二天......
        int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK);
        if (dayOfWeek == 1) {
            return -6;
        } else {
            return 2 - dayOfWeek;
        }
    }

//（2）获得本周星期一的日期
    public Calendar getCurrentMonday() {
        int mondayPlus = this.getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus);
        Date monday = currentDate.getTime();
        Calendar c = Calendar.getInstance();
        c.setTime(monday);
        return c;
    }

//（3）通过在本周的星期一的Calendar上连续加1，获取一周的日期

   public ArrayList<WeekInfo> getCurrentWeekInfoList(){
   Calendar now = Calendar.getInstance();
   todayInfo = now.get(Calendar.YEAR) + "-" + (now.get(Calendar.MONTH) + 1) + "-" + now.get(Calendar.DAY_OF_MONTH);


   ArrayList<WeekInfo> weekInfoList = new ArrayList<WeekInfo>();
   Calendar mondayDate = getCurrentMonday();                       //本周星期一的Calendar
   String monday = (mondayDate.get(Calendar.MONTH) + 1) + "月" + mondayDate.get(Calendar.DAY_OF_MONTH) + "日" + " " + "星期一";
   WeekInfo weekInfo = new WeekInfo();
   weekInfo.setTodayInfo(todayInfo);
   weekInfo.setWeekDayInfo(monday);
   weekInfo.setWeekDate(mondayDate.get(Calendar.YEAR) + "-" + (mondayDate.get(Calendar.MONTH) + 1) + "-" + mondayDate.get(Calendar.DAY_OF_MONTH));
   weekInfoList.add(weekInfo);

   mondayDate.add(Calendar.DAY_OF_MONTH, 1);
   String tuesday = (mondayDate.get(Calendar.MONTH) + 1) + "月" + mondayDate.get(Calendar.DAY_OF_MONTH) + "日" + " " + "星期二";
   WeekInfo weekInfo2 = new WeekInfo();
   weekInfo2.setTodayInfo(todayInfo);
   weekInfo2.setWeekDayInfo(tuesday);
   weekInfo2.setWeekDate(mondayDate.get(Calendar.YEAR) + "-" + (mondayDate.get(Calendar.MONTH) + 1) + "-" + mondayDate.get(Calendar.DAY_OF_MONTH));
   weekInfoList.add(weekInfo2);



   mondayDate.add(Calendar.DAY_OF_MONTH, 1);
   String wednesday = (mondayDate.get(Calendar.MONTH) + 1) + "月" + mondayDate.get(Calendar.DAY_OF_MONTH) + "日" + " " + "星期三";
   WeekInfo weekInfo3 = new WeekInfo();
   weekInfo3.setTodayInfo(todayInfo);
   weekInfo3.setWeekDayInfo(wednesday);
   weekInfo3.setWeekDate(mondayDate.get(Calendar.YEAR) + "-" + (mondayDate.get(Calendar.MONTH) + 1) + "-" + mondayDate.get(Calendar.DAY_OF_MONTH));
   weekInfoList.add(weekInfo3);


   mondayDate.add(Calendar.DAY_OF_MONTH, 1);
   String thursday = (mondayDate.get(Calendar.MONTH) + 1) + "月" + mondayDate.get(Calendar.DAY_OF_MONTH) + "日" + " " + "星期四";
   WeekInfo weekInfo4 = new WeekInfo();
   weekInfo4.setTodayInfo(todayInfo);
   weekInfo4.setWeekDayInfo(thursday);
   weekInfo4.setWeekDate(mondayDate.get(Calendar.YEAR) + "-" + (mondayDate.get(Calendar.MONTH) + 1) + "-" + mondayDate.get(Calendar.DAY_OF_MONTH));
   weekInfoList.add(weekInfo4);

   mondayDate.add(Calendar.DAY_OF_MONTH, 1);
   String friday = (mondayDate.get(Calendar.MONTH) + 1) + "月" + mondayDate.get(Calendar.DAY_OF_MONTH) + "日" + " " + "星期五";
   WeekInfo weekInfo5 = new WeekInfo();
   weekInfo5.setTodayInfo(todayInfo);
   weekInfo5.setWeekDayInfo(friday);
   weekInfo5.setWeekDate(mondayDate.get(Calendar.YEAR) + "-" + (mondayDate.get(Calendar.MONTH) + 1) + "-" + mondayDate.get(Calendar.DAY_OF_MONTH));
   weekInfoList.add(weekInfo5);


   mondayDate.add(Calendar.DAY_OF_MONTH, 1);
   String saturday = (mondayDate.get(Calendar.MONTH) + 1) + "月" + mondayDate.get(Calendar.DAY_OF_MONTH) + "日" + " " + "星期六";
   WeekInfo weekInfo6 = new WeekInfo();
   weekInfo6.setTodayInfo(todayInfo);
   weekInfo6.setWeekDayInfo(saturday);
   weekInfo6.setWeekDate(mondayDate.get(Calendar.YEAR) + "-" + (mondayDate.get(Calendar.MONTH) + 1) + "-" + mondayDate.get(Calendar.DAY_OF_MONTH));
   weekInfoList.add(weekInfo6);

   mondayDate.add(Calendar.DAY_OF_MONTH, 1);
   String sunday = (mondayDate.get(Calendar.MONTH) + 1) + "月" + mondayDate.get(Calendar.DAY_OF_MONTH) + "日" + " " + "星期日";
   WeekInfo weekInfo7 = new WeekInfo();
   weekInfo7.setTodayInfo(todayInfo);
   weekInfo7.setWeekDayInfo(sunday);
   weekInfo7.setWeekDate(mondayDate.get(Calendar.YEAR) + "-" + (mondayDate.get(Calendar.MONTH) + 1) + "-" + mondayDate.get(Calendar.DAY_OF_MONTH));
   weekInfoList.add(weekInfo7);

   return weekInfoList;
}