如何找出按下的字符键？

document.addEventListener('keydown', function(event) {
  console.log('按下的键：', event.key);
});

import keyboard

while True:
    try:
        if keyboard.is_pressed('a'):
            print('按下的键：a')
    except:
        continue

private void Form1_KeyDown(object sender, KeyEventArgs e) {
  Console.WriteLine("按下的键：" + e.KeyCode);
}

public class KeyListenerExample implements KeyListener {
    public void keyPressed(KeyEvent e) {
        System.out.println("按下的键：" + KeyEvent.getKeyText(e.getKeyCode()));
    }

    public void keyReleased(KeyEvent e) {
    }

    public void keyTyped(KeyEvent e) {
    }
}