JDK8 LocalDateTime转换成时间戳

LocalDateTime localDateTime = LocalDateTime.now();
System.out.println(localDateTime);
//将localDateTime转换成时间戳    System.out.println("localDateTime:"+java.sql.Timestamp.valueOf(localDateTime).getTime());
//使用System获取时间戳
System.out.println("system:"+System.currentTimeMillis());