java gregoriancalendar如何处理日期序列化

Java??GregorianCalendar???????????????,???????????GregorianCalendar???????????:

1. ???: ??GregorianCalendar??????????,?????Java?ObjectOutputStream????,????GregorianCalendar????????????????,????????????????:

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.util.GregorianCalendar;

public class CalendarSerialization {
    public static void main(String[] args) {
        GregorianCalendar calendar = new GregorianCalendar();
        // ???????
        calendar.set(2021, 9, 1, 0, 0, 0);

        try {
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
            objectOutputStream.writeObject(calendar);
            objectOutputStream.close();

            byte[] serializedCalendar = byteArrayOutputStream.toByteArray();
            System.out.println("Serialized calendar: " + bytesToHex(serializedCalendar));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static String bytesToHex(byte[] bytes) {
        StringBuilder sb = new StringBuilder();
        for (byte b : bytes) {
            sb.append(String.format("x", b));
        }
        return sb.toString();
    }
}

2. ????: ???????????GregorianCalendar??,?????Java?ObjectInputStream????,???????????????????,?????????????GregorianCalendar??:

import java.io.ByteArrayInputStream;
import java.io.ObjectInputStream;
import java.util.GregorianCalendar;

public class CalendarDeserialization {
    public static void main(String[] args) {
        byte[] serializedCalendar = new byte[]{...}; // ??????????????

        try {
            ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(serializedCalendar);
            ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);
            GregorianCalendar deserializedCalendar = (GregorianCalendar) objectInputStream.readObject();
            objectInputStream.close();

            System.out.println("Deserialized calendar: " + deserializedCalendar.getTime());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

??,??????GregorianCalendar????????????????,???????????,????????????????????