获取当前是星期几
public static int getWeekOfDate(Date dt) {int[] weekDays = { 7, 1, 2, 3, 4, 5, 6 };//String[] weekDays = {"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(dt);int w = cal.get(Calendar.DAY_OF_WEEK) - 1;if (w < 0)w = 0;return weekDays[w];}public static int getWeekOfDate(Calendar cal) {int[] weekDays = { 7, 1, 2, 3, 4, 5, 6 };int w = cal.get(Calendar.DAY_OF_WEEK) - 1;if (w < 0)w = 0;return weekDays[w];}public static int getWeekOfDate(long time) {int[] weekDays = { 7, 1, 2, 3, 4, 5, 6 };Calendar cal = Calendar.getInstance();cal.setTimeInMillis(time);int w = cal.get(Calendar.DAY_OF_WEEK) - 1;if (w < 0)w = 0;return weekDays[w];}