Home > Articles > Programming > Java

  • Print
  • + Share This
From the author of

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.

  • + Share This
  • 🔖 Save To Your Account