/*
下面是我写得一个测试的程序，运行后，不点击按钮的情况下，按小写状态下的'w'时，弹出对话框，
但是当点击按钮后，面板上的监听失去了，我想用鼠标监听把焦点设置回来，可是不好使了
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class testjiaodian extends JFrame
{
    JPanel apanel;
    public testjiaodian()
    {
        setSize(100,100);
        apanel=new JPanel();
        apanel.addMouseListener(new MouseHandler());
        apanel.addKeyListener(new keyhandle());        
        apanel.setFocusable(true);        
        apanel.add(new JButton("点我"));
        add(apanel);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    private class MouseHandler extends MouseAdapter
    {
        public void mousePressed(MouseEvent event)
        {
            apanel.setFocusable(true);
        }
    }
    private class keyhandle implements KeyListener
    {   
        public void keyPressed(KeyEvent event){}
        public void keyReleased(KeyEvent event){}
        public void keyTyped(KeyEvent event)
        {
            int i;
            char keychar = event.getKeyChar();
            if(keychar == 'w')
            {
                JOptionPane.showMessageDialog(null, "键盘响应", "信息", JOptionPane.DEFAULT_OPTION   );            
            }
        }
    }
    public static void main(String args[])
    {
        new testjiaodian();
    }
};

谢谢大侠~ 很好用，我的毕设就靠他了。。