import java.time.*;import java.time.format.DateTimeFormatter;import java.util.Date;public class DateTimeUtils {    /**     * 格式化LocalDateTime实例为日期时间字符串     *     * @param localDateTime     * @param regex     */    public static String format(LocalDateTime localDateTime, String regex) throws Exception {        return localDateTime.format(DateTimeFormatter.ofPattern(regex));    }    /**     * 解析日期时间字符串为LocalDateTime实例     *     * @param str     * @param regex     */    public static LocalDateTime parse(String str, String regex) throws Exception {        return LocalDateTime.parse(str, DateTimeFormatter.ofPattern(regex));    }    /**     * Date实例转为LocalDateTime实例     *     * @param date     */    public static LocalDateTime Date2LocalDateTime(Date date) throws Exception {        LocalDateTime localDateTime = LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault());        System.out.println("localDateTime = " + localDateTime);        return localDateTime;    }    /**     * LocalDateTime实例转为Date实例，用到了Instant、ZoneId以及ZoneDateTime     *     * @param localDateTime     */    public static Date LocalDateTime2Date(LocalDateTime localDateTime) throws Exception {        Date date = Date.from(localDateTime.atZone(ZoneId.systemDefault()).toInstant());        System.out.println("date = " + date);        return date;    }}