Programming Forums > Application Development > Java

grimpirate · Jul 12th, 2006, 5:52 PM

I have the following line of code in a class named TestGUI:

frame.setIconImage(Toolkit.getDefaultToolkit().createImage("images/grimserve.gif"));

Which basically sets up the icon in JFrame's title bar. However, when I create an executable jar file (with the TestGUI class and the folder images included) and run it, the image grimserve.gif won't display. I was told that I had to use the Class.getResource() method, but I'm unsure how to proceed. Can someone show me how this code should be modified so that the jar file runs properly, or explain how the getResource method is relevant. Thx for the help.

Kaja Fumei · Jul 12th, 2006, 6:34 PM

If the "images" directory is in the top-level directory of the jar:

(Toggle Plain Text)

InputStream stream = getClass().getResourceAsStream("/images/grimserve.gif");

Then, read the entire input stream into a byte array and pass that array to createImage().

If you remove the beginning "/", it'll treat the path as a relative path from the directory of the current class file. For more info on getResourceAsStream: http://www.javaworld.com/javaworld/j...-property.html

Toro · Jul 12th, 2006, 7:45 PM

you must have the folder "images" in the same directory as the Jar file. Try changing the directory by just making the image the same place as the Jar.

Maybe that will help

grimpirate · Jul 12th, 2006, 8:47 PM

I apologize, this whole getResource stuff is very cryptic to me and I read the javaworld tutorial/explanation you posted there Kaja Fumei, but had no luck understand it. I get lost in all the technical jargon. So I'm just going to show you what I'm working with.
Here is the full code of the program:

(Toggle Plain Text)

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.awt.geom.*;

public class CBZGUI
{
    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("GrimServe");
        
//        BufferedImage icon = new BufferedImage(32, 32, BufferedImage.TYPE_INT_ARGB);
//        Graphics2D g2 = icon.createGraphics();
//        g2.setColor(new Color(0, 0, 0));
//        g2.draw(new Line2D.Double(0, 0, 32, 32));

//        frame.setIconImage(icon);
        frame.setIconImage(Toolkit.getDefaultToolkit().createImage("images/grimserve.gif"));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        DisplayPanel dispPanel = new DisplayPanel();
        frame.setContentPane(dispPanel);
        
        frame.pack();
        frame.setVisible(true);
    }
    
    public static void main(String[] args)
    {
        javax.swing.SwingUtilities.invokeLater
        (
            new Runnable()
            {
                public void run()
                {
                    createAndShowGUI();
                }
            }
        );
    }
}

class DisplayPanel extends JPanel implements KeyListener
{
    public DisplayPanel()
    {
        setLayout(new BorderLayout());
        
        textArea.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(textArea);
        
        textArea.setToolTipText("GrimServe console display.");
        textField.setToolTipText("GrimServe command input.");
        
        textField.setFocusTraversalKeysEnabled(false);
        textField.addKeyListener(this);
        
        textArea.setText("-=GrimServe 2.0=-\n");
        add(scrollPane, BorderLayout.CENTER);
        add(textField, BorderLayout.SOUTH);
    }
    
    public void keyPressed(KeyEvent e)
    {
        // Enter key
        if(e.getKeyCode() == 10)
        {
            textArea.append(textField.getText() + "\n");
            textField.setText("");
        }
    }
    public void keyReleased(KeyEvent e){}
    public void keyTyped(KeyEvent e) {}
    
    final JTextArea textArea = new JTextArea(15, 45);
    final JTextField textField = new JTextField();
}

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.awt.geom.*;

public class CBZGUI
{
    private static void createAndShowGUI()
    {
        JFrame frame = new JFrame("GrimServe");
        
//        BufferedImage icon = new BufferedImage(32, 32, BufferedImage.TYPE_INT_ARGB);
//        Graphics2D g2 = icon.createGraphics();
//        g2.setColor(new Color(0, 0, 0));
//        g2.draw(new Line2D.Double(0, 0, 32, 32));

//        frame.setIconImage(icon);
        frame.setIconImage(Toolkit.getDefaultToolkit().createImage("images/grimserve.gif"));
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        DisplayPanel dispPanel = new DisplayPanel();
        frame.setContentPane(dispPanel);
        
        frame.pack();
        frame.setVisible(true);
    }
    
    public static void main(String[] args)
    {
        javax.swing.SwingUtilities.invokeLater
        (
            new Runnable()
            {
                public void run()
                {
                    createAndShowGUI();
                }
            }
        );
    }
}

class DisplayPanel extends JPanel implements KeyListener
{
    public DisplayPanel()
    {
        setLayout(new BorderLayout());
        
        textArea.setEditable(false);
        JScrollPane scrollPane = new JScrollPane(textArea);
        
        textArea.setToolTipText("GrimServe console display.");
        textField.setToolTipText("GrimServe command input.");
        
        textField.setFocusTraversalKeysEnabled(false);
        textField.addKeyListener(this);
        
        textArea.setText("-=GrimServe 2.0=-\n");
        add(scrollPane, BorderLayout.CENTER);
        add(textField, BorderLayout.SOUTH);
    }
    
    public void keyPressed(KeyEvent e)
    {
        // Enter key
        if(e.getKeyCode() == 10)
        {
            textArea.append(textField.getText() + "\n");
            textField.setText("");
        }
    }
    public void keyReleased(KeyEvent e){}
    public void keyTyped(KeyEvent e) {}
    
    final JTextArea textArea = new JTextArea(15, 45);
    final JTextField textField = new JTextField();
}

And here is the structure of my jar file which I obtain from typing in my command prompt jar tf grimserve.jar

(Toggle Plain Text)

META-INF/MANIFEST.MF
CBZGUI$1.class
CBZGUI.class
DisplayPanel.class
images/grimserve.gif

So how do I get my code to access that very last file images/grimserve.gif? I hate asking for someone to just like correct my code and show me, but I'm honestly just not grasping what I'm doing wrong. I know that if I put a folder outside with the file in it then the app will work fine, but what I want to do is package all my files together in one jar file and make it work. Thx again for the help.

Kaja Fumei · Jul 13th, 2006, 11:02 AM

getResourceAsStream is just a method primarily used for reading files stored inside the current jar.

(Toggle Plain Text)

long length = 1024;  // change to the size in bytes of the actual gif
byte[] gif = new byte[length];
InputStream stream = getClass().getResourceAsStream("/images/grimserve.gif");
stream.read(gif);
frame.setIconImage(Toolkit.getDefaultToolkit().createImage(gif));

There may be a simpler way of building an image from the InputStream but I'm not very familiar with the java GUI packages.

Jul 12th, 2006, 5:52 PM	#1
grimpirate King of Portal Join Date: Sep 2005 Posts: 437 Rep Power: 4	Jar File Problem I have the following line of code in a class named TestGUI: (Toggle Plain Text) frame.setIconImage(Toolkit.getDefaultToolkit().createImage("images/grimserve.gif")); frame.setIconImage(Toolkit.getDefaultToolkit().createImage("images/grimserve.gif")); Which basically sets up the icon in JFrame's title bar. However, when I create an executable jar file (with the TestGUI class and the folder images included) and run it, the image grimserve.gif won't display. I was told that I had to use the Class.getResource() method, but I'm unsure how to proceed. Can someone show me how this code should be modified so that the jar file runs properly, or explain how the getResource method is relevant. Thx for the help. __________________ Lo, there do I see my father. 'Lo, there do I see My mother, and my sisters, and my brothers. 'Lo, there do I see The line of my people... Back to the beginning. 'Lo, they do call to me. They bid me take my place among them. In the halls of Valhalla... Where the brave... May live... ...forever.. GrimBB \| Mimesis

Jul 12th, 2006, 6:34 PM	#2
Kaja Fumei Hobbyist Programmer Join Date: Oct 2005 Posts: 134 Rep Power: 4	If the "images" directory is in the top-level directory of the jar: (Toggle Plain Text) InputStream stream = getClass().getResourceAsStream("/images/grimserve.gif"); InputStream stream = getClass().getResourceAsStream("/images/grimserve.gif"); Then, read the entire input stream into a byte array and pass that array to createImage(). If you remove the beginning "/", it'll treat the path as a relative path from the directory of the current class file. For more info on getResourceAsStream: http://www.javaworld.com/javaworld/j...-property.html

Jul 12th, 2006, 8:47 PM	#4
grimpirate King of Portal Join Date: Sep 2005 Posts: 437 Rep Power: 4	I'm Failing to Understand I apologize, this whole getResource stuff is very cryptic to me and I read the javaworld tutorial/explanation you posted there Kaja Fumei, but had no luck understand it. I get lost in all the technical jargon. So I'm just going to show you what I'm working with. Here is the full code of the program: (Toggle Plain Text) import java.awt.; import java.awt.event.; import java.awt.image.; import javax.swing.; import java.awt.geom.; public class CBZGUI { private static void createAndShowGUI() { JFrame frame = new JFrame("GrimServe"); // BufferedImage icon = new BufferedImage(32, 32, BufferedImage.TYPE_INT_ARGB); // Graphics2D g2 = icon.createGraphics(); // g2.setColor(new Color(0, 0, 0)); // g2.draw(new Line2D.Double(0, 0, 32, 32)); // frame.setIconImage(icon); frame.setIconImage(Toolkit.getDefaultToolkit().createImage("images/grimserve.gif")); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); DisplayPanel dispPanel = new DisplayPanel(); frame.setContentPane(dispPanel); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater ( new Runnable() { public void run() { createAndShowGUI(); } } ); } } class DisplayPanel extends JPanel implements KeyListener { public DisplayPanel() { setLayout(new BorderLayout()); textArea.setEditable(false); JScrollPane scrollPane = new JScrollPane(textArea); textArea.setToolTipText("GrimServe console display."); textField.setToolTipText("GrimServe command input."); textField.setFocusTraversalKeysEnabled(false); textField.addKeyListener(this); textArea.setText("-=GrimServe 2.0=-\n"); add(scrollPane, BorderLayout.CENTER); add(textField, BorderLayout.SOUTH); } public void keyPressed(KeyEvent e) { // Enter key if(e.getKeyCode() == 10) { textArea.append(textField.getText() + "\n"); textField.setText(""); } } public void keyReleased(KeyEvent e){} public void keyTyped(KeyEvent e) {} final JTextArea textArea = new JTextArea(15, 45); final JTextField textField = new JTextField(); } import java.awt.; import java.awt.event.; import java.awt.image.; import javax.swing.; import java.awt.geom.; public class CBZGUI { private static void createAndShowGUI() { JFrame frame = new JFrame("GrimServe"); // BufferedImage icon = new BufferedImage(32, 32, BufferedImage.TYPE_INT_ARGB); // Graphics2D g2 = icon.createGraphics(); // g2.setColor(new Color(0, 0, 0)); // g2.draw(new Line2D.Double(0, 0, 32, 32)); // frame.setIconImage(icon); frame.setIconImage(Toolkit.getDefaultToolkit().createImage("images/grimserve.gif")); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); DisplayPanel dispPanel = new DisplayPanel(); frame.setContentPane(dispPanel); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater ( new Runnable() { public void run() { createAndShowGUI(); } } ); } } class DisplayPanel extends JPanel implements KeyListener { public DisplayPanel() { setLayout(new BorderLayout()); textArea.setEditable(false); JScrollPane scrollPane = new JScrollPane(textArea); textArea.setToolTipText("GrimServe console display."); textField.setToolTipText("GrimServe command input."); textField.setFocusTraversalKeysEnabled(false); textField.addKeyListener(this); textArea.setText("-=GrimServe 2.0=-\n"); add(scrollPane, BorderLayout.CENTER); add(textField, BorderLayout.SOUTH); } public void keyPressed(KeyEvent e) { // Enter key if(e.getKeyCode() == 10) { textArea.append(textField.getText() + "\n"); textField.setText(""); } } public void keyReleased(KeyEvent e){} public void keyTyped(KeyEvent e) {} final JTextArea textArea = new JTextArea(15, 45); final JTextField textField = new JTextField(); } And here is the structure of my jar file which I obtain from typing in my command prompt jar tf grimserve.jar (Toggle Plain Text) META-INF/MANIFEST.MF CBZGUI$1.class CBZGUI.class DisplayPanel.class images/grimserve.gif META-INF/MANIFEST.MF CBZGUI$1.class CBZGUI.class DisplayPanel.class images/grimserve.gif So how do I get my code to access that very last file images/grimserve.gif? I hate asking for someone to just like correct my code and show me, but I'm honestly just not grasping what I'm doing wrong. I know that if I put a folder outside with the file in it then the app will work fine, but what I want to do is package all my files together in one jar file and make it work. Thx again for the help. __________________ Lo, there do I see my father. 'Lo, there do I see My mother, and my sisters, and my brothers. 'Lo, there do I see The line of my people... Back to the beginning. 'Lo, they do call to me. They bid me take my place among them. In the halls of Valhalla... Where the brave... May live... ...forever.. GrimBB \| Mimesis

Jul 13th, 2006, 11:02 AM	#5
Kaja Fumei Hobbyist Programmer Join Date: Oct 2005 Posts: 134 Rep Power: 4	getResourceAsStream is just a method primarily used for reading files stored inside the current jar. (Toggle Plain Text) long length = 1024; // change to the size in bytes of the actual gif byte[] gif = new byte[length]; InputStream stream = getClass().getResourceAsStream("/images/grimserve.gif"); stream.read(gif); frame.setIconImage(Toolkit.getDefaultToolkit().createImage(gif)); long length = 1024; // change to the size in bytes of the actual gif byte[] gif = new byte[length]; InputStream stream = getClass().getResourceAsStream("/images/grimserve.gif"); stream.read(gif); frame.setIconImage(Toolkit.getDefaultToolkit().createImage(gif)); There may be a simpler way of building an image from the InputStream but I'm not very familiar with the java GUI packages.

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Jul 12th, 2006, 7:45 PM	#3
Toro Hobbyist Programmer Join Date: Apr 2006 Posts: 136 Rep Power: 0	you must have the folder "images" in the same directory as the Jar file. Try changing the directory by just making the image the same place as the Jar. Maybe that will help

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Programming Forums > Application Development > Java

Jar File Problem