JAVA----日期周的常用方法，如：获取当前周周一日期

    public static String getCurrentMonday() {
        SimpleDateFormat dateFormat = new SimpleDateFormat(YYYY_MM_DD);
        int mondayPlus = getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus);
        Date monday = currentDate.getTime();

        return dateFormat.format(monday);
    }

    
    private static int getMondayPlus() {
        Calendar cd = Calendar.getInstance();
        // 默认：星期日是第一天
        int dayOfWeek = cd.get(Calendar.DAY_OF_WEEK);

        if (dayOfWeek == 1) {
            return -6;
        } else {
            return 2 - dayOfWeek;
        }
    }

System.out.println(getCurrentMonday());

2022-01-03

    public static String getPreviousSunday() {
        SimpleDateFormat dateFormat = new SimpleDateFormat(YYYY_MM_DD);
        int mondayPlus = getMondayPlus();
        GregorianCalendar currentDate = new GregorianCalendar();
        currentDate.add(GregorianCalendar.DATE, mondayPlus + 6);
        Date sunday = currentDate.getTime();
        return dateFormat.format(sunday);
    }

System.out.println(getPreviousSunday());

2022-01-09