java万年历javaswing带系统时间

Java万年历是使用Java编写的日历应用程序，可以显示任何日期和年份的日历，并具有一些其他功能，例如计算两个日期之间的天数和周数等。

JavaSwing是Java平台的用户界面（UI）工具包，Java开发人员可以使用它来创建桌面应用程序。

将JavaSwing集成到Java万年历中可以增强应用程序的用户界面，使其更加美观和易于使用。

为了带有系统时间，可以使用Java提供的时间类（java.util.Date）和格式化类（java.text.SimpleDateFormat）。我们可以使用SimpleDateFormat将系统时间格式化为我们想要的格式，并将其放在Java万年历的合适位置。

当Java万年历启动时，我们可以使用以下代码来获取当前系统时间：

Date date = new Date();
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
String sysTime = dateFormat.format(date);

将该字符串sysTime插入到Java万年历的适当位置即可。

综上所述，通过将JavaSwing和系统时间集成到Java万年历中，可以增强应用程序的用户界面和实用性。

相关问题

用Java swing组件和Java card写一个带备忘录的万年历

好的，以下是一个简单的Java Swing和Java Card应用程序示例，它实现了一个带备忘录的万年历。该应用程序使用Java Swing组件构建用户界面，并使用Java Card存储备忘录数据。

Java Swing部分：

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Date;
import java.text.DateFormat;
import java.text.SimpleDateFormat;

public class MyCalendar extends JFrame implements ActionListener {

    private JTextArea memo;
    private JButton saveButton;
    private JButton loadButton;
    private JTextField dateField;
    private JButton showButton;
    private JLabel messageLabel;

    public MyCalendar() {
        setTitle("MyCalendar");
        setSize(400, 300);

        JPanel topPanel = new JPanel();
        dateField = new JTextField(10);
        topPanel.add(dateField);
        showButton = new JButton("Show");
        showButton.addActionListener(this);
        topPanel.add(showButton);
        add(topPanel, BorderLayout.NORTH);

        memo = new JTextArea();
        JScrollPane memoScrollPane = new JScrollPane(memo);
        add(memoScrollPane, BorderLayout.CENTER);

        JPanel bottomPanel = new JPanel();
        saveButton = new JButton("Save");
        saveButton.addActionListener(this);
        bottomPanel.add(saveButton);
        loadButton = new JButton("Load");
        loadButton.addActionListener(this);
        bottomPanel.add(loadButton);
        add(bottomPanel, BorderLayout.SOUTH);

        messageLabel = new JLabel();
        add(messageLabel, BorderLayout.SOUTH);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == showButton) {
            showMemo();
        } else if (e.getSource() == saveButton) {
            saveMemo();
        } else if (e.getSource() == loadButton) {
            loadMemo();
        }
    }

    private void showMemo() {
        String dateString = dateField.getText();
        try {
            DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
            Date date = dateFormat.parse(dateString);
            String memoText = JavaCard.getMemo(date);
            memo.setText(memoText);
            messageLabel.setText("");
        } catch (Exception e) {
            messageLabel.setText("Invalid date format: " + dateString);
        }
    }

    private void saveMemo() {
        String dateString = dateField.getText();
        String memoText = memo.getText();
        try {
            DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
            Date date = dateFormat.parse(dateString);
            JavaCard.saveMemo(date, memoText);
            messageLabel.setText("Memo saved for date: " + dateString);
        } catch (Exception e) {
            messageLabel.setText("Invalid date format: " + dateString);
        }
    }

    private void loadMemo() {
        String memoText = JavaCard.loadMemo();
        memo.setText(memoText);
        messageLabel.setText("Memo loaded from card.");
    }

    public static void main(String[] args) {
        MyCalendar calendar = new MyCalendar();
        calendar.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        calendar.setVisible(true);
    }
}

Java Card部分：

import javacard.framework.*;
import javacard.security.*;
import javacardx.crypto.*;

public class JavaCard extends Applet {

    private static final byte MEMO_RECORD_SIZE = 256;
    private static final byte MEMO_RECORD_COUNT = 100;

    private static final byte INS_SAVE_MEMO = (byte) 0x01;
    private static final byte INS_LOAD_MEMO = (byte) 0x02;

    private static final short MEMO_RECORDS_OFFSET = (short) 0x0000;
    private static final short MEMO_RECORD_SIZE_OFFSET = (short) 0x7F00;

    private static final byte[] DEFAULT_KEY = new byte[] {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08};

    private Cipher cipher;
    private byte[] sessionKey;
    private RandomData random;

    private JavaCard() {
        random = RandomData.getInstance(RandomData.ALG_SECURE_RANDOM);
        cipher = Cipher.getInstance(Cipher.ALG_DES_CBC_ISO9797_M2, false);
        sessionKey = new byte[8];
    }

    public static void install(byte[] bArray, short bOffset, byte bLength) {
        new JavaCard().register();
    }

    public void process(APDU apdu) {
        byte[] buffer = apdu.getBuffer();

        if (selectingApplet()) {
            return;
        }

        switch (buffer[ISO7816.OFFSET_INS]) {
            case INS_SAVE_MEMO:
                saveMemo(buffer);
                break;
            case INS_LOAD_MEMO:
                loadMemo(apdu);
                break;
            default:
                ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
        }
    }

    private void saveMemo(byte[] buffer) {
        byte[] data = new byte[MEMO_RECORD_SIZE];
        short dataOffset = 0;
        short recordOffset = MEMO_RECORDS_OFFSET;

        while (recordOffset < MEMO_RECORDS_OFFSET + MEMO_RECORD_COUNT * MEMO_RECORD_SIZE) {
            short bytesRead = readRecord(recordOffset, data, dataOffset, MEMO_RECORD_SIZE);
            if (bytesRead == 0) {
                break;
            }
            recordOffset += MEMO_RECORD_SIZE;
            dataOffset += bytesRead;
        }

        short newRecordOffset = getNewRecordOffset();
        Util.arrayCopy(buffer, ISO7816.OFFSET_CDATA, data, newRecordOffset, MEMO_RECORD_SIZE);
        writeRecord(newRecordOffset, data, newRecordOffset, MEMO_RECORD_SIZE);
    }

    private void loadMemo(APDU apdu) {
        byte[] buffer = apdu.getBuffer();
        short bytesRead = readRecord(MEMO_RECORDS_OFFSET, buffer, ISO7816.OFFSET_CDATA, MEMO_RECORD_SIZE);
        apdu.setOutgoingAndSend(ISO7816.OFFSET_CDATA, bytesRead);
    }

    private short readRecord(short offset, byte[] buffer, short bufferOffset, short length) {
        cipher.init(new SecretKeySpec(sessionKey, (short) 0, (short) sessionKey.length, Cipher.ALG_DES_CBC_NOPAD), Cipher.MODE_DECRYPT);
        cipher.doFinal(DEFAULT_KEY, (short) 0, (short) DEFAULT_KEY.length, buffer, MEMO_RECORD_SIZE_OFFSET);

        Util.arrayCopy(buffer, MEMO_RECORD_SIZE_OFFSET + offset, buffer, bufferOffset, length);

        random.generateData(sessionKey, (short) 0, (short) sessionKey.length);
        cipher.init(new SecretKeySpec(sessionKey, (short) 0, (short) sessionKey.length, Cipher.ALG_DES_CBC_NOPAD), Cipher.MODE_ENCRYPT);
        cipher.doFinal(DEFAULT_KEY, (short) 0, (short) DEFAULT_KEY.length, buffer, MEMO_RECORD_SIZE_OFFSET);

        return length;
    }

    private void writeRecord(short offset, byte[] buffer, short bufferOffset, short length) {
        cipher.init(new SecretKeySpec(sessionKey, (short) 0, (short) sessionKey.length, Cipher.ALG_DES_CBC_NOPAD), Cipher.MODE_DECRYPT);
        cipher.doFinal(DEFAULT_KEY, (short) 0, (short) DEFAULT_KEY.length, buffer, MEMO_RECORD_SIZE_OFFSET);

        Util.arrayCopy(buffer, bufferOffset, buffer, MEMO_RECORD_SIZE_OFFSET + offset, length);

        random.generateData(sessionKey, (short) 0, (short) sessionKey.length);
        cipher.init(new SecretKeySpec(sessionKey, (short) 0, (short) sessionKey.length, Cipher.ALG_DES_CBC_NOPAD), Cipher.MODE_ENCRYPT);
        cipher.doFinal(DEFAULT_KEY, (short) 0, (short) DEFAULT_KEY.length, buffer, MEMO_RECORD_SIZE_OFFSET);
    }

    private short getNewRecordOffset() {
        short recordOffset = MEMO_RECORDS_OFFSET;
        while (recordOffset < MEMO_RECORDS_OFFSET + MEMO_RECORD_COUNT * MEMO_RECORD_SIZE) {
            if (readRecord(recordOffset, JCSystem.makeTransientByteArray(MEMO_RECORD_SIZE, JCSystem.CLEAR_ON_DESELECT), (short) 0, MEMO_RECORD_SIZE) == 0) {
                return recordOffset;
            }
            recordOffset += MEMO_RECORD_SIZE;
        }
        ISOException.throwIt(ISO7816.SW_FILE_FULL);
        return (short) 0;
    }

    public static String getMemo(Date date) {
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String dateString = dateFormat.format(date);
        byte[] buffer = new byte[MEMO_RECORD_SIZE];
        short bytesRead = JavaCard.getInstance().readRecord((short) (MEMO_RECORDS_OFFSET + dateString.getBytes().length), buffer, (short) 0, MEMO_RECORD_SIZE);
        return new String(buffer, (short) 0, bytesRead);
    }

    public static void saveMemo(Date date, String memo) {
        DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
        String dateString = dateFormat.format(date);
        byte[] buffer = new byte[MEMO_RECORD_SIZE];
        Util.arrayCopy(dateString.getBytes(), (short) 0, buffer, (short) 0, (short) dateString.getBytes().length);
        Util.arrayCopy(memo.getBytes(), (short) 0, buffer, (short) dateString.getBytes().length, (short) memo.getBytes().length);
        JavaCard.getInstance().writeRecord((short) (MEMO_RECORDS_OFFSET + dateString.getBytes().length), buffer, (short) 0, MEMO_RECORD_SIZE);
    }

    public static String loadMemo() {
        byte[] buffer = new byte[MEMO_RECORD_SIZE];
        JavaCard.getInstance().readRecord(MEMO_RECORDS_OFFSET, buffer, (short) 0, MEMO_RECORD_SIZE);
        return new String(buffer, (short) 0, MEMO_RECORD_SIZE);
    }

    private static JavaCard instance;

    private static JavaCard getInstance() {
        if (instance == null) {
            instance = new JavaCard();
        }
        return instance;
    }
}

这只是一个简单的示例，您可以根据您的需求进行修改和扩展。请注意，Java Card应用程序的可用内存和处理能力可能有限，因此您需要谨慎考虑您的应用程序设计和实现。