ランダムな日付を生成

回転:   http://horizonhyg.iteye.com/blog/402097
 

       /**  
         *         
         * @param beginDate     ，   ：yyyy-MM-dd  
         * @param endDate     ，   ：yyyy-MM-dd  
         * @return  
         */  
        private static Date randomDate(String beginDate,String endDate){   
            try {   
                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");   
                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){   
         //  begin end        
            long rtn = begin + (long)(Math.random() * (end - begin));   
  
            if(rtn == begin || rtn == end){   
                return random(begin,end);   
            }   
            return rtn;   
        }