/**
 * 根據當前日期獲得是星期幾
 * time=yyyy-MM-dd
 * @return
*/
public static String getWeek(String time) {
    String Week = "";
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
Calendar c = Calendar.getInstance();
    try {
        c.setTime(format.parse(time));
} catch (ParseException e) {
        e.printStackTrace();
 
}

    int wek=c.get(Calendar.DAY_OF_WEEK);
    if (wek == 1) {
        Week += "星期日";
}
    if (wek == 2) {
        Week += "星期一";
}
    if (wek == 3) {
        Week += "星期二";
}
    if (wek == 4) {
        Week += "星期三";
}
    if (wek == 5) {
        Week += "星期四";
}
    if (wek == 6) {
        Week += "星期五"
 
;
}
    if (wek == 7) {
        Week += "星期六";
}
    return Week;
}