如何在Java程序内实现键盘监听？

 

package com.bovy.ui;

import java.awt.KeyboardFocusManager;

import javax.swing.JFrame;

public class KeyboardListener extends JFrame ...{

    /** *//**
     * Launch the application
     * 
     * @param args
     */
    public static void main(String args[]) ...{
        try ...{
            KeyboardListener frame = new KeyboardListener();
            frame.setVisible(true);
        } catch (Exception e) ...{
            e.printStackTrace();
        }
    }

    /** *//**
     * Create the frame
     */
    public KeyboardListener() ...{
        super();
        setTitle("在Java内实现键盘监听");
        setBounds(100, 100, 500, 375);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        //
        KeyboardFocusManager manager = KeyboardFocusManager
                .getCurrentKeyboardFocusManager();
        manager.addKeyEventPostProcessor(new MyKeyEventPostProcessor());
    }
}

 

 

package com.bovy.ui;

import java.awt.KeyEventPostProcessor;
import java.awt.event.KeyEvent;

public class MyKeyEventPostProcessor implements KeyEventPostProcessor ...{
    public boolean postProcessKeyEvent(KeyEvent event) ...{
        System.out.println(KeyEvent.getKeyText(event.getKeyCode()));
        return true;
    }
}