import java.util.Calendar;import java.util.Date;public class Daojishi {        static String Countdown="";                public static void main(String[] args) {            //开启倒计时            time2();            System.out.println("Countdown="+Countdown);        }        /**         * 倒计时,设定时间戳         */        private static void time2() {                        Calendar c = Calendar.getInstance();            c.set(c.get(Calendar.YEAR), (c.get(Calendar.MONTH) + 1), c.get(Calendar.DAY_OF_MONTH)+1, c.get(Calendar.HOUR_OF_DAY), c.get(Calendar.MINUTE), c.get(Calendar.SECOND));// 注意月份的设置，0-11表示1-12月                 long endTime = c.getTimeInMillis();            Date date = new Date();            long startTime = date.getTime();            long midTime = (endTime - startTime) / 1000;                        while (midTime > 0) {                midTime--;                long hh = midTime / 60 / 60 % 60;                long mm = midTime / 60 % 60;                long ss = midTime % 60;                System.out.println("还剩" + hh + "小时" + mm + "分钟" + ss + "秒");                System.out.println( hh+""+mm+""+ss+"");                Countdown=hh+""+mm+""+ss+"";                try {                    Thread.sleep(1000);                } catch (InterruptedException e) {                    e.printStackTrace();                }            }        }}

 参考：

http://www.cnblogs.com/heizai002/p/6862625.html

http://blog.csdn.net/kookob/article/details/6885383