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/**
* 根据日期获得星期 * @param date * @return */ public static String getWeekOfDate(Date date) { String[] weekDaysName = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" }; String[] weekDaysCode = { "0", "1", "2", "3", "4", "5", "6" }; Calendar calendar = Calendar.getInstance(); calendar.setTime(date); int intWeek = calendar.get(Calendar.DAY_OF_WEEK) - 1; return weekDaysCode[intWeek]; } /** * 获得周一的日期 * * @param date * @return */ public static String getMonday(Date date) {Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
return dateFormat.format(calendar.getTime());
}
/** * 获得周三的日期 * * @param date * @return */ public static String getWednesday(Date date) {Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_WEEK, Calendar.WEDNESDAY);
return dateFormat.format(calendar.getTime());
}
/** * 获得周五的日期 * * @param date * @return */ public static String getFriday(Date date) {Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
return dateFormat.format(calendar.getTime());
}/**
* 当前日期前几天或者后几天的日期 * @param n * @return */ public static String afterNDay(int n) {Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
calendar.add(Calendar.DATE, n);
Date date = calendar.getTime();
String s = dateFormat.format(date);
return s;
}
/** * 判断两个日期是否在同一周 * * @param date1 * @param date2 * @return */ public static boolean isSameWeekDates(Date date1, Date date2) { Calendar cal1 = Calendar.getInstance(); Calendar cal2 = Calendar.getInstance(); cal1.setTime(date1); cal2.setTime(date2); int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR); if (0 == subYear) { if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2 .get(Calendar.WEEK_OF_YEAR)) return true; } else if (1 == subYear && 11 == cal2.get(Calendar.MONTH)) { // 如果12月的最后一周横跨来年第一周的话则最后一周即算做来年的第一周 if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2 .get(Calendar.WEEK_OF_YEAR)) return true; } else if (-1 == subYear && 11 == cal1.get(Calendar.MONTH)) { if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2 .get(Calendar.WEEK_OF_YEAR)) return true; } return false; }