获取某个日期是星期几

/**
 * 获取显示的星期
 * 
 * @param date
 * @return
 */
public static String getWeekDaysByDate(Date date) {
	final String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" };
	Calendar cal = Calendar.getInstance();
	cal.setTime(date);
	int weekDays = cal.get(Calendar.DAY_OF_WEEK) - 1;
	return dayNames[weekDays];
}