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1
2 import com4j.ComException;
3 import wsh.ClassFactory;
4
5 import javax.swing.*;
6 import javax.swing.border.EmptyBorder  ;
7 import java.awt.*;
8 import java.awt.event.ActionEvent ;
9 import java.awt.event.ActionListener ;
10
11
16 public class SwingDemo extends JFrame {
17 private JTextField value;
18 private JButton submit;
19 private JTextField name;
20
21 public SwingDemo() throws HeadlessException {
22 super("com4j demo");
23
24 Container panel = getContentPane();
25 panel.setLayout(new GridBagLayout());
26 GridBagConstraints c = new GridBagConstraints();
27
28 panel.add( new JLabel("Env var name:"), c );
29
30 c = new GridBagConstraints();
31 c.gridx=1;
32 c.ipadx=200;
33 c.fill=GridBagConstraints.BOTH;
34 panel.add( name = new JTextField(), c );
35 name.setEditable(true);
36
37 c = new GridBagConstraints();
38 c.gridx=2;
39 panel.add( submit = new JButton("Enter"), c );
40
41 c = new GridBagConstraints();
42 c.gridy=1;
43 c.gridwidth=3;
44 c.fill=GridBagConstraints.BOTH;
45 panel.add( value = new JTextField("Type in an environment variable (like 'PATH') and see its value"), c );
46 value.setEditable(false);
47 value.setBorder(new EmptyBorder (4,4,4,4));
48 value.setBackground(getBackground());
49 registerListeners();
50
51 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
52
53 pack();
54 setVisible(true);
55 setResizable(false);
56 }
57
58 private void registerListeners() {
59 ActionListener l = new ActionListener () {
60 public void actionPerformed(ActionEvent e) {
61 value.setText(expandEnvVar(name.getText()));
62 }
63 };
64 submit.addActionListener(l);
65 name.addActionListener(l);
66 }
67
68
69 public String expandEnvVar(String name) {
70 try {
71 name = '%'+name+'%';
72 String value = ClassFactory.createWshShell().expandEnvironmentStrings(name);
73 if(name.equals(value))
74 return "Not a valid variable";
75 else
76 return value;
77 } catch( ComException e ) {
78 return e.getMessage();
79 }
80 }
81
82 public static void main(String [] args) throws Exception {
83 UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
84 JFrame.setDefaultLookAndFeelDecorated(true);
85 new SwingDemo();
86 }
87 }
88
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Java API By Example, From Geeks To Geeks.