在Java中获得"unixtime"

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

public class Unixtime {

    public static void main(String[] args) {
        LocalDateTime localDateTime = LocalDateTime.of(2022, 1, 1, 12, 0);
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        String formattedDateTime = localDateTime.format(formatter);
        System.out.println("Unixtime: " + formattedDateTime);
    }
}