Java键盘事件监听

Java键盘事件监听

Java键盘事件监听（一）：

1. package com.han;  
2.   
3. import java.awt.Container;  
4. import java.awt.event.KeyEvent;  
5. import java.awt.event.KeyListener;  
6.   
7. import javax.swing.JFrame;  
8. import javax.swing.JLabel;  
9. import javax.swing.JScrollPane;  
10. import javax.swing.JTextArea;  
11. import javax.swing.SpringLayout;  
12.   
13. /** 
14.  * 键盘事件监听(1) 
15.  * @author HAN 
16.  * 
17.  */  
18. public class KeyEvent_1 extends JFrame {  
19.   
20.     /** 
21.      *  
22.      */  
23.     private static final long serialVersionUID = -6762512303624322086L;  
24.   
25.     public KeyEvent_1() {  
26.         // TODO Auto-generated constructor stub   
27.         Container container = getContentPane();  
28.         SpringLayout springLayout = new SpringLayout();  
29.         container.setLayout(springLayout);  
30.         JLabel remarqueLabel = new JLabel("remarque :");  
31.         JTextArea textArea = new JTextArea(3, 30);  
32.         JScrollPane scrollPane = new JScrollPane();  
33.         scrollPane.setViewportView(textArea);  
34.         container.add(remarqueLabel);  
35.         springLayout.putConstraint(SpringLayout.WEST, remarqueLabel, 5,  
36.                 SpringLayout.WEST, container);  
37.         springLayout.putConstraint(SpringLayout.NORTH, remarqueLabel, 5,  
38.                 SpringLayout.NORTH, container);  
39.         container.add(scrollPane);  
40.         springLayout.putConstraint(SpringLayout.WEST, scrollPane, 5,  
41.                 SpringLayout.EAST, remarqueLabel);  
42.         springLayout.putConstraint(SpringLayout.NORTH, scrollPane, 5,  
43.                 SpringLayout.NORTH, container);  
44.         springLayout.putConstraint(SpringLayout.EAST, scrollPane, -5,  
45.                 SpringLayout.EAST, container);  
46.         springLayout.putConstraint(SpringLayout.SOUTH, scrollPane, -5,  
47.                 SpringLayout.SOUTH, container);  
48.   
49.         textArea.addKeyListener(new KeyListener() {  
50.   
51.             @Override  
52.             public void keyTyped(KeyEvent e) {  
53.                 // TODO Auto-generated method stub   
54.                 System.out.println("The charactor you typed : " + "\""  
55.                         + e.getKeyChar() + "\"");  
56.             }  
57.   
58.             @Override  
59.             public void keyPressed(KeyEvent e) {  
60.                 // TODO Auto-generated method stub   
61.                   
62.                 // 写大写字母时，释放按键是不知道是否先释放的是shift还是字母按键；但是   
63.                 // 可以肯定的是按按键时必须是先按的shift。   
64.                 if (e.getKeyCode() == KeyEvent.VK_CONTROL ||   
65.                         e.getKeyCode() == KeyEvent.VK_SHIFT ||  
66.                         e.getKeyCode() == KeyEvent.VK_ALT) {  
67.                     System.out.println("\n" + "The Component triggered : " + e.getSource());  
68.                 }  
69.                 if (!(e.isControlDown() || e.isShiftDown() || e.isAltDown())) {  
70.                     System.out.println("\n" + "The Component triggered : " + e.getSource());  
71.                 }  
72.                 String keyText = KeyEvent.getKeyText(e.getKeyCode());  
73.                 if (e.isActionKey()) {  
74.                     System.out.print("The action key you pressed : " + "\""  
75.                             + keyText + "\"");  
76.                 } else {  
77.                     System.out.print("The non-action key you pressed : " + "\""  
78.                             + keyText + "\"");  
79.                     int keyCode = e.getKeyCode();  
80.                     switch (keyCode) {  
81.                     case KeyEvent.VK_CONTROL:  
82.                         System.out.print(", Control key is pressed");  
83.                         break;  
84.                     case KeyEvent.VK_SHIFT:  
85.                         System.out.print(", Shift key is pressed");  
86.                         break;  
87.                     case KeyEvent.VK_ALT:  
88.                         System.out.print(", Alt key is pressed");  
89.                         break;  
90.                     }  
91.                 }  
92.                 System.out.println();  
93.             }  
94.   
95.             @Override  
96.             public void keyReleased(KeyEvent e) {  
97.                 // TODO Auto-generated method stub   
98.                 // the integer code for an actual key on the keyboard.    
99.                 // (For KEY_TYPED events, the keyCode is VK_UNDEFINED.)   
100.                 System.out.println("The key you released : " +  "\"" +  
101.                         KeyEvent.getKeyText(e.getKeyCode()) + "\"");  
102.             }  
103.   
104.         });  
105.     }  
106.   
107.     /** 
108.      * @param args 
109.      */  
110.     public static void main(String[] args) {  
111.         // TODO Auto-generated method stub   
112.         KeyEvent_1 frame = new KeyEvent_1();  
113.         frame.setTitle("KeyEvent Test");  
114.         frame.setVisible(true);  
115.         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
116.         frame.setBounds(0, 0, 600, 300);  
117.     }  
118.   
119. }