请求帮助：关于键盘消息映射

Question

你将下面的代码运行一下，就很清楚了。
Good Luck！import javax.swing.*;import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.Insets;import java.util.Vector;import java.awt.event.FocusListener;
import java.awt.event.FocusEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;public class FocusEventDemo extends JApplet
                            implements FocusListener,
                                       ActionListener {    JTextArea display;
    FocusWindow window;
    JButton b1, b2;
    static final String SHOW = "show";
    static final String CLEAR = "clear";
    static final String newline = "\n";    public void init() {
        b1 = new JButton("Click to bring up a window.");
        b1.setActionCommand(SHOW);
        b1.addActionListener(this);        b2 = new JButton("Click to clear the display.");
        b2.setActionCommand(CLEAR);
        b2.addActionListener(this);        display = new JTextArea();
        display.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(display);
        scrollPane.setPreferredSize(new Dimension(375, 125));
                                
        JPanel contentPane = new JPanel();
        contentPane.setLayout(new BorderLayout());
        contentPane.add(b1, BorderLayout.NORTH);
        contentPane.add(scrollPane, BorderLayout.CENTER);
        contentPane.add(b2, BorderLayout.SOUTH);
        setContentPane(contentPane);        //Create but don't show window.
        window = new FocusWindow(this);
    }    public void stop() {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                window.setVisible(false);
            }
        });
    }    public void focusGained(FocusEvent e) {
        displayMessage("Focus gained", e);
    }    public void focusLost(FocusEvent e) {
        displayMessage("Focus lost", e);
    }    void displayMessage(String prefix, FocusEvent e) {
        display.append(prefix
                       + ": "
                       + e.getComponent()
                       + newline); 
    }    public void actionPerformed(ActionEvent e) {
        if (e.getActionCommand() == SHOW) {
            window.pack();
            window.setVisible(true);
        } else { //CLEAR
            display.setText("");
        }
    }
}class FocusWindow extends JFrame {
    public FocusWindow(FocusListener listener) {
        super("Focus Event Window");
        //We'll use the default close operation -- hiding.        JPanel contentPane = new JPanel();
        this.addFocusListener(listener);        GridBagLayout gridbag = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();
        contentPane.setLayout(gridbag);        c.fill = GridBagConstraints.HORIZONTAL;
        c.weightx = 1.0;  //Make column as wide as possible.
        JTextField textField = new JTextField("A TextField");
        textField.setMargin(new Insets(0,2,0,2));
        textField.addFocusListener(listener);
        gridbag.setConstraints(textField, c);
        contentPane.add(textField);        c.weightx = 0.1;  //Widen every other column a bit, when possible. 
        c.fill = GridBagConstraints.NONE;
        JLabel label = new JLabel("A Label");
        label.setBorder(BorderFactory.createEmptyBorder(0,5,0,5));
        label.addFocusListener(listener);
        gridbag.setConstraints(label, c);
        contentPane.add(label);        //We'll add a focus listener to a choice, but since it's
        //typically implemented as a compound component, we aren't
        //likely to get any events.
        String choiceprefix = "Choice item #";
        final int numItems = 10;
        Vector vector = new Vector(numItems);
        for (int i = 0; i < numItems; i++) {
            vector.addElement(choiceprefix + i);
        }
        JComboBox choice = new JComboBox(vector);
        choice.addFocusListener(listener);
        gridbag.setConstraints(choice, c);
        contentPane.add(choice);        c.gridwidth = GridBagConstraints.REMAINDER;
        JButton button = new JButton("A Button");
        button.addFocusListener(listener);
        gridbag.setConstraints(button, c);
        contentPane.add(button);        c.weighty = 1.0;   //Make this row as tall as possible.
        c.weightx = 0.0;   
        c.fill = GridBagConstraints.BOTH;
        String listprefix = "List item #";
        Vector listVector = new Vector(numItems);
        for (int i = 0; i < numItems; i++) {
            listVector.addElement(listprefix + i);
        }
        JList list = new JList(listVector);
        JScrollPane scrollPane = new JScrollPane(list);
        list.addFocusListener(listener);
        gridbag.setConstraints(scrollPane, c);
        contentPane.add(scrollPane);        setContentPane(contentPane);
    }
}

Answer 1

可是我需要的是:
    很多个key和很多个button分别对应啊！按下一个key就相当于按下了相应的
button。各位好心人再指点指点我

Answer 2

对不起，把代码发错了：不好意思，再试试！
import javax.swing.*;
import java.awt.event.*;
import java.awt.BorderLayout;
import java.awt.Dimension;public class KeyEventDemo extends JApplet 
                          implements KeyListener,
                                     ActionListener {
    JTextArea displayArea;
    JTextField typingArea;
    static final String newline = "\n";    public void init() {
        JButton button = new JButton("Clear");
        button.addActionListener(this);        typingArea = new JTextField(20);
        typingArea.addKeyListener(this);        displayArea = new JTextArea();
        displayArea.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(displayArea);
        scrollPane.setPreferredSize(new Dimension(375, 125));        JPanel contentPane = new JPanel();
        contentPane.setLayout(new BorderLayout());
        contentPane.add(typingArea, BorderLayout.NORTH);
        contentPane.add(scrollPane, BorderLayout.CENTER);
        contentPane.add(button, BorderLayout.SOUTH);
        setContentPane(contentPane);
    }    /** Handle the key typed event from the text field. */
    public void keyTyped(KeyEvent e) {
        displayInfo(e, "KEY TYPED: ");
    }    /** Handle the key pressed event from the text field. */
    public void keyPressed(KeyEvent e) {
        displayInfo(e, "KEY PRESSED: ");
    }    /** Handle the key released event from the text field. */
    public void keyReleased(KeyEvent e) {
        displayInfo(e, "KEY RELEASED: ");
    }    /** Handle the button click. */
    public void actionPerformed(ActionEvent e) {
        //Clear the text components.
        displayArea.setText("");
        typingArea.setText("");        //Return the focus to the typing area.
        typingArea.requestFocus();
    }    /*
     * We have to jump through some hoops to avoid
     * trying to print non-printing characters 
     * such as Shift.  (Not only do they not print, 
     * but if you put them in a String, the characters
     * afterward won't show up in the text area.)
     */
    protected void displayInfo(KeyEvent e, String s){
        String charString, keyCodeString, modString, tmpString;        char c = e.getKeyChar();
        int keyCode = e.getKeyCode();
        int modifiers = e.getModifiers();        if (Character.isISOControl(c)) {
            charString = "key character = "
                       + "(an unprintable control character)";
        } else {
            charString = "key character = '"
                       + c + "'";
        }        keyCodeString = "key code = " + keyCode
                        + " ("
                        + KeyEvent.getKeyText(keyCode)
                        + ")";        modString = "modifiers = " + modifiers;
        tmpString = KeyEvent.getKeyModifiersText(modifiers);
        if (tmpString.length() > 0) {
            modString += " (" + tmpString + ")";
        } else {
            modString += " (no modifiers)";
        }        displayArea.append(s + newline
                           + "    " + charString + newline
                           + "    " + keyCodeString + newline
                           + "    " + modString + newline);
    }
}

Answer 3

你再用java.util.map将你想要的映射映射一下即可。
Button的事件响应应该很简单吧！

Answer 4

唉，我就是不知道java.util.map怎么映射啊！我的标题难道没说明白吗？还繁劳各位帮帮忙

Answer 5

JButton b1 = new JButton("D");
b1.setMnemonic(KeyEvent.VK_NUMPAD4);运行后,alt+小键盘的4就响应了.
但是好像还是不很符合你的要求.
没有什么现成的东西,靠自己写好一点.