Java 生成指定范围内的随机时间

淩亂°似流年 2023-10-10 17:52 2阅读 0赞

package test;
    
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.Random;
    
    public class Test2 {
        public static void main(String[] args) throws Exception {
        	randomDate("2022-05-10", null);
        	randomDate("2022-05-10", "2022-05-11");
        }
        
        /**
         * 生成随机时间
         * @param beginDate	开始时间范围
         * @param endDate	结束时间范围
         * @return
         * @throws ParseException 
         */
        public static String randomDate(String beginDate,String endDate) throws ParseException{
        	//格式化时间
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            
            //如果不需要时分秒，下面拼接00:00:00也不需要
    //        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    
            //随机起始时间拼接时分秒
            beginDate += " 00:00:00";
            //解析时间
            Date d1 = sdf.parse(beginDate);
            long before = d1.getTime();
            
            //默认获取当前时间
            Date d2 = new Date();
            if(endDate != null){
            	//拼接时分秒
            	endDate += " 00:00:00";
            	d2 = sdf.parse(endDate);
            }
            long after = d2.getTime();
            
            Random r = new Random();
            long randomDate = (long) (before + (r.nextFloat() * (after - before + 1)));
            
            String date = sdf.format(randomDate);
            System.out.println(date);
            return date;
        }
    
    }