根据日期获取星期几

public class DateUtil {
    public static String strToDate(String strDate) throws ParseException {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
        Calendar c = Calendar.getInstance();
        c.setTime(formatter.parse(strDate));
        SimpleDateFormat sdf = new SimpleDateFormat("EEEE");
        String week = sdf.format(c.getTime());
        return week;
    }
}