日期格式YYYY-MM-DD:
//Java日期格式转换成星期几 yyyy-MM-ddpublic static String dateToWeek(String datetime) throws ParseException {String rq = datetime;String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};Date date = new SimpleDateFormat("yyyy-MM-dd").parse(rq);Calendar cal = Calendar.getInstance();cal.setTime(date);int w = cal.get(Calendar.DAY_OF_WEEK) - 1 < 0 ? 0 : cal.get(Calendar.DAY_OF_WEEK) - 1;String week= weekDays[w];return week;}
执行结果：
