public class AppTime {

    public static void main(String[] args) {

获取当前时间后两个小时的时间戳  

          Calendar calendar = Calendar.getInstance();
           calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) + 2)

下面的是别人的 他是获取当前时间1天后的时间戳 其实是一样的

        Calendar calendar = Calendar.getInstance();
        long createTime = calendar.getTimeInMillis();
        System.out.println(createTime);   
        SimpleDateFormat form = new SimpleDateFormat(“yyyy-MM-dd HH-mm-ss”);
        String res = form.format(createTime);
        System.out.println(res); 

        calendar.set(Calendar.DAY_OF_YEAR, calendar.get(Calendar.DAY_OF_YEAR) + 1);
        System.out.println(calendar.getTimeInMillis()); 

        Date today = calendar.getTime();
        String result = format.format(today);
        System.out.println(result);   

    }
}