//数据库LocalDateTime->Timestamp
		Timestamp timestamp = Timestamp.valueOf(LocalDateTime.now());
		System.out.println(timestamp);
		
		//Timestamp -> LocalDateTime 精度多了，转换会麻烦吗
		DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
		String timestampS = timestamp.toString();
		timestampS = timestampS.substring(0, timestampS.lastIndexOf('.'));
		System.out.println(timestampS);
		String formatTimestamp = LocalDateTime.parse(timestampS,dateTimeFormatter).format(dateTimeFormatter);
		System.out.println("Timestamp formatter :" + formatTimestamp);