Question

Java中，如何让KeyListener与ActionListener同时监听？

一个JFrame中。让键盘按键与JButton同时监听的方法。无论点那个都与反应。
希望给我一个源代码。最简单的那种……
或则给我个思路。

Answer 1

监听器应该加在JTextArea上，而不是窗口上：

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class KeyinEvent extends JFrame implements KeyListener
{
JTextArea textarea=new JTextArea(4,20);
Container c;

public KeyinEvent()
{
super("按键测试");
c=getContentPane();
c.setLayout(new FlowLayout());
textarea.addKeyListener(this);
c.add(textarea);
//textarea.setText("请按任意键");
setSize(300,120);
setVisible(true);
//addKeyListener(this);
}

public void keyPressed(KeyEvent e)
{
String line1="按键"+e.getKeyChar();
String line2="按键是否为Action键"+e.isActionKey();
String mkey=e.getKeyModifiersText(e.getModifiers());
String line3="是否按下Modifier键"+(mkey.equals("")?"否":"是，其键为："+mkey);
textarea.setText(line1+"\n"+line2+"\n"+line3+"\n");
}

public void keyReleased(KeyEvent e){}
public void keyTyped(KeyEvent e){}
public static void main(String[] args)
{
KeyinEvent be=new KeyinEvent();
be.addWindowListener(new MyWindowListener());
}
}

class MyWindowListener implements WindowListener
{
public void windowActivated(WindowEvent e)
{
System.out.println("窗口为活动状态");
}

public void windowClosed(WindowEvent e)
{
System.out.println("窗口为关闭状态");
System.exit(0);
}

public void windowClosing(WindowEvent e)
{
System.out.println("窗口正在关闭");
System.exit(0);
}

public void windowDeactivated(WindowEvent e)
{
System.out.println("窗口不再活动");
}

public void windowDeiconified(WindowEvent e)
{
System.out.println("窗口由最小化变为正常");
}

public void windowIconified(WindowEvent e)
{
System.out.println("窗口为最小化");
}

public void windowOpened(WindowEvent e)
{
System.out.println("窗口首次可见");
}
}

Answer 2

JButton直接添加ActionListener事件就行了

btn_login.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				login();
			}
		});

没用过JButton也要监听键盘的。。。下面是一种全局监听Enter键的办法，当然还有别的办法

Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener(){
			public void eventDispatched(AWTEvent e){
				if(((KeyEvent)e).getKeyChar()==KeyEvent.VK_ENTER){
					login();
				}
			}
		},AWTEvent.KEY_EVENT_MASK);

Answer 3

KeyListener的监听要保证当前组件持有焦点
ActionListener作用于按钮组件时只要鼠标点击就可以触发

Answer 4

添加监听就是了。
AddKeyListener(.....);
AddActionListener(.....);