Java使用彈簧布局管理器

Java使用彈簧布局管理器：

1. package com.han;  
2.   
3. import java.awt.Container;  
4. import java.awt.event.WindowAdapter;  
5. import java.awt.event.WindowEvent;  
6.   
7. import javax.swing.JButton;  
8. import javax.swing.JFrame;  
9. import javax.swing.JLabel;  
10. import javax.swing.JScrollPane;  
11. import javax.swing.JTextArea;  
12. import javax.swing.JTextField;  
13. import javax.swing.Spring;  
14. import javax.swing.SpringLayout;  
15.   
16. /** 
17.  * 使用彈簧布局管理器 
18.  * @author HAN 
19.  * 
20.  */  
21. public class SpringLayout_3 extends JFrame {  
22.   
23.     /** 
24.      *  
25.      */  
26.     private static final long serialVersionUID = -6045918631932051025L;  
27.   
28.     public SpringLayout_3() {  
29.         // TODO Auto-generated constructor stub   
30.         Container container = getContentPane();  
31.         SpringLayout springLayout = new SpringLayout();  
32.         container.setLayout(springLayout);  
33.         JLabel topicLabel = new JLabel("topic :");  
34.         JLabel contentLabel = new JLabel("content :");  
35.         final JTextField textField = new JTextField(30);  
36.         JTextArea textArea = new JTextArea(3, 30);  
37.         JScrollPane scrollPane = new JScrollPane();  
38.         scrollPane.setViewportView(textArea);  
39.         textArea.setLineWrap(true);  
40.         final JButton confirmButton = new JButton("confirm");  
41.         JButton cancelButton = new JButton("cancel");  
42.         Spring st = Spring.constant(10);  
43.         Spring st2 = Spring.constant(30);  
44.         container.add(topicLabel);  
45.         springLayout.putConstraint(SpringLayout.NORTH, topicLabel, st,   
46.                 SpringLayout.NORTH, container);  
47.         springLayout.putConstraint(SpringLayout.WEST, topicLabel, st,   
48.                 SpringLayout.WEST, container);  
49.         container.add(textField);  
50.         springLayout.putConstraint(SpringLayout.WEST, textField, st2,   
51.                 SpringLayout.EAST, topicLabel);  
52.         springLayout.putConstraint(SpringLayout.NORTH, textField, 0,   
53.                 SpringLayout.NORTH, topicLabel);  
54.         springLayout.putConstraint(SpringLayout.EAST, textField, Spring.minus(st),   
55.                 SpringLayout.EAST, container);  
56.         container.add(contentLabel);  
57.         springLayout.putConstraint(SpringLayout.WEST, contentLabel, 0,   
58.                 SpringLayout.WEST, topicLabel);  
59.         springLayout.putConstraint(SpringLayout.NORTH, contentLabel, st,   
60.                 SpringLayout.SOUTH, topicLabel);  
61.         container.add(scrollPane);  
62.         springLayout.putConstraint(SpringLayout.NORTH, scrollPane, 0,   
63.                 SpringLayout.NORTH, contentLabel);  
64.         springLayout.putConstraint(SpringLayout.WEST, scrollPane, 0,   
65.                 SpringLayout.WEST, textField);  
66.         springLayout.putConstraint(SpringLayout.EAST, scrollPane, Spring.minus(st),   
67.                 SpringLayout.EAST, container);  
68.         container.add(confirmButton);  
69.         springLayout.putConstraint(SpringLayout.SOUTH, scrollPane, Spring.minus(st),   
70.                 SpringLayout.NORTH, confirmButton);  
71.         springLayout.putConstraint(SpringLayout.EAST, confirmButton, Spring.minus(st),   
72.                 SpringLayout.EAST, container);  
73.         springLayout.putConstraint(SpringLayout.SOUTH, confirmButton, Spring.minus(st),   
74.                 SpringLayout.SOUTH, container);  
75.         container.add(cancelButton);  
76.         springLayout.putConstraint(SpringLayout.EAST, cancelButton, Spring.minus(st),   
77.                 SpringLayout.WEST, confirmButton);  
78.         springLayout.putConstraint(SpringLayout.NORTH, cancelButton, 0,   
79.                 SpringLayout.NORTH, confirmButton);   
80.           
81.         // make the text field focused every time the window is activated   
82.         addWindowFocusListener(new WindowAdapter() {  
83.   
84.             @Override  
85.             public void windowGainedFocus(WindowEvent e) {  
86.                 // TODO Auto-generated method stub   
87.                 textField.requestFocus();  
88.             }  
89.   
90.         });  
91.     }  
92.   
93.     /** 
94.      * @param args 
95.      */  
96.     public static void main(String[] args) {  
97.         // TODO Auto-generated method stub   
98.         SpringLayout_3 frame = new SpringLayout_3();  
99.         frame.setTitle("使用彈簧布局管理器");  
100.         frame.setVisible(true);  
101.         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
102.         frame.setBounds(100, 100, 600, 300);  
103.     }  
104.   
105. }