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An Example
You now create your first JNLP file that will launch a dummy application over the Web. If you don't have a Web server, you can modify the example in order to let it work from the local file system as well. The JNLP file in Listing 1 did that. Specifically, see line 3 for an example of how to use the local file system with JNLP.
The Application
Suppose you have an application, a common Java application that you have created before you knew about JNLP. The application is reported in Listing 2.
Listing 2. A Simple Example Application
00 import java.awt.*;
01 import javax.swing.*;
02 import java.awt.event.*;
03
04 /**
05 * An Example Application
06 * "Hello JNLP!"
07 * Just pops up a dialog
08 *
09 * @author Mauro Marinilli
10 * @version 1.0
11 */
12 public class Example extends JDialog {
13 JPanel panel1 = new JPanel();
14 BorderLayout borderLayout1 = new BorderLayout();
15 JLabel jLabel = new JLabel();
16 JPanel southPanel = new JPanel();
17 JButton okButton = new JButton();
18
19 public Example(Frame frame, String title, boolean modal) {
20 super(frame, title, modal);
21 try {
22 initUI();
23 pack();
24 } catch(Exception ex) {
25 ex.printStackTrace();
26 }
27 }
28
29 public Example() {
30 this(null, "", true);
31 }
32
33 void initUI() throws Exception {
34 panel1.setLayout(borderLayout1);
35 jLabel.setHorizontalAlignment(SwingConstants.CENTER);
36 jLabel.setHorizontalTextPosition(SwingConstants.CENTER);
37 jLabel.setLabelFor(okButton);
38 jLabel.setText("<html><body><h1>Hello JNLP!");
39 okButton.setToolTipText("close the example dialog");
40 okButton.setText("<html><body><tt>OK");
41 okButton.addActionListener(new java.awt.event.ActionListener() {
42 public void actionPerformed(ActionEvent e) {
43 dismiss();
44 }
45 });
46 setTitle("Example Dialog");
47 addWindowListener(new java.awt.event.WindowAdapter() {
48 public void windowClosing(WindowEvent e) {
49 dismiss();
50 }
51 });
52 getContentPane().add(panel1);
53 panel1.add(jLabel, BorderLayout.NORTH);
54 panel1.add(southPanel, BorderLayout.SOUTH);
55 southPanel.add(okButton, null);
56 pack();
57 setVisible(true);
58 }
59
60 /**
61 * the Main method
62 */
63 static public void main(String[] args) {
64 Example e = new Example();
65 }
66
67 /**
68 * dismiss the dialog
69 */
70 void dismiss() {
71 System.exit(0);
72 }
73
74 }
75
This is just an example that shows a message dialog box.