Java鍵盤事件監聽

Java鍵盤事件監聽（一）：

1. package com.han;
3. import java.awt.Container;
4. import java.awt.event.KeyEvent;
5. import java.awt.event.KeyListener;
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;
13. /**
14. * 鍵盤事件監聽(1)
15. * @author HAN
16. *
17. */
18. public class KeyEvent_1 extends JFrame {
20. /**
21. *
22. */
23. private static final long serialVersionUID = -6762512303624322086L;
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);
49. textArea.addKeyListener(new KeyListener() {
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. }
58. @Override
59. public void keyPressed(KeyEvent e) {
60. // TODO Auto-generated method stub
62. // 寫大寫字母時，釋放按鍵是不知道是否先釋放的是shift還是字母按鍵；但是
63. // 可以肯定的是按按鍵時必須是先按的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. }
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. }
104. });
105. }
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. }
119. }