Java 获取随机日期

/**
     * 获取随机日期
     * @param beginDate 起始日期
     * @param endDate 结束日期
     * @return
     */
    public static Date randomDate(String beginDate,String endDate){
        try {
            SimpleDateFormat format = new SimpleDateFormat(DATEFORMAT_YYYY_MM_DD_24HH_MM_SS);
            Date start = format.parse(beginDate);
            Date end = format.parse(endDate);
            
            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 rtn = begin + (long)(Math.random() * (end - begin));
        if(rtn == begin || rtn == end){
            return random(begin,end);
        }
        return rtn;
    }