如何忽略毫秒并使用DateTimeFormatter格式化

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

LocalDateTime dateTime = LocalDateTime.now();

String formattedDateTime = dateTime.format(formatter);

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class DateTimeFormattingExample {
    public static void main(String[] args) {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        LocalDateTime dateTime = LocalDateTime.now();
        String formattedDateTime = dateTime.format(formatter);
        System.out.println("Formatted DateTime: " + formattedDateTime);
    }
}