LocalDateTime转换格式

可以使用DateTimeFormatter类来转换LocalDateTime的格式。例如，将LocalDateTime转换为字符串：

LocalDateTime now = LocalDateTime.now();
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
String formatDateTime = now.format(formatter);
System.out.println(formatDateTime);

将字符串转换为LocalDateTime：

String dateTimeStr = "2022-01-01 12:00:00";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
LocalDateTime dateTime = LocalDateTime.parse(dateTimeStr, formatter);
System.out.println(dateTime);