产生随机时间的例子

public class test{
    public static void main(String[] args) {          
            Date randomDate = randomDate("2012-06-01", "2012-12-12");
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            System.out.println(randomDate。toString());
    }
 
    private static Date randomDate(String beginDate, String endDate) {
        try {
            SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
            Date start = format.parse(beginDate);// 开始日期
            Date end = format.parse(endDate);// 结束日期
            if (start.getTime() >= end.getTime()) {
                return null;
            }
            long date = random(start.getTime(), end.getTime());
 
            return new Date(date);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
 
    private static long random(long begin, long end) {
        long rtnn = begin + (long) (Math.random() * (end - begin));
        if (rtnn == begin || rtnn == end) {
            return random(begin, end);
        }
        return rtnn;
    }
}