I am currently using the following code segment to get the image for the interface.
ImageIcon img = new ImageIcon("./lib/logo.gif");
JLabel lblNewLabel = new JLabel("");
lblNewLabel.setIcon(img);
lblNewLabel.setBounds(28, 65, 140, 100);
However, when i execute clean and build, the image does not appear when i execute the jar file. What seems to be the problem and where should I put the image file? Thanks in advance.
"However, when i execute clean and build, the image does not appear when i execute the jar file. What seems to be the problem and where should I put the image file?"
This is the reason you don't load from a file. You want to load it as an embedded resources from your class path with a URL
Your image should be in a package somewhere in the src during development. When you build, the IDE with copy that image for you into the class path, and add it to the jar
Then to load from the class path in your code.
Class.getResource(..) return a URL, so you want to do this
ImageIcon icon = new ImageIcon(MyClass.class.getResource("/images/logo.gif"));
In the code snippet you provided, the path to the image file is considered to be on the file system (the constructor of class ImageIcon takes a file name as an argument). If you want to load a file (or an image) from the jar itself, you need to use ClassLoader.getResourceAsStream(). Check this question.
Related
I don't quite understand how creation of a Swing application really works.
I have created a simple application that gets a background image from a path.
ImageIcon imageIcon = new ImageIcon("C:\\Java\\ApplicationName\\out\\Resourses\\backGround.jpg");
Image image = imageIcon.getImage(); // Создание картинки из него
Image temp = image.getScaledInstance(500,500,Image.SCALE_SMOOTH);
imageIcon = new ImageIcon(temp);
g2d.drawImage(temp,0,0,null);
It works, so I decided to make a JAR file independent from changes in the Java folder (like deleting this image) and put images in src - images ( package ). I don't know if it is possible though.
I started to get background image like this.
ImageIcon imageIcon = new ImageIcon(this.getClass().getResource("/images/backGround.jpg"));
The program works perfectly in IntelliJ IDEA but if I extract it to JAR file I get a blank background screen. Why is that?
And can I have my entire application including images in a single JAR file? One that is not dependent on other folders?
You can certainly put the image and the code in a single jar file. The image is not loading either because it's not in the jar file, or because it's not at the path /images/backGround.jpg inside the jar.
One helpful thing about jar files that you may not know: they are in .zip format, so you can use any zip tool to see what is inside the jar (temporarily renaming the jar file to .zip might make this easier). IF the image is not there, fix your jar build (you didn't say how you are making it, so not sure what you need to change). If the image is there but under a different path, then fix the jar build to put it in the right place, or change the path you are reading it from.
Yes definitely you can include your entire application into single jar file i.e. Runnable jar file. But i would suggest you not to include your image inside the jar file, instead pass that image path to an Property file and use that property file in your code for image path. So that even if next time you need to change the image you just change the path in your property file and you dont have to export your entire project again.
When running a Java app from eclipse my ImageIcon shows up just fine.
But after creating a jar the path to the image obviously gets screwed up.
Is there a way to extract an image from the jar at runtime so I can then open it up? Or, is there a better way to do this?
I'd like to distribute a single jar file if possible.
To create an ImageIcon from an image file within the same jars your code is loaded:
new javax.swing.ImageIcon(getClass().getResource("myimage.jpeg"))
Class.getResource returns a URL of a resource (or null!). ImageIcon has a constructors that load from a URL.
To construct a URL for a resource in a jar not on your "classpath", see the documentation for java.net.JarURLConnection.
You can try something like:
InputStream stream = this.getClass().getClassLoader().getResourceAsStream("/images/image.jpg");
In your JAR file, you might have a directory structure of:
MyJAR.jar
- com (class files in here)
- images
----image.jpg
This is working for me to load and set the content pane background image:
jar (or build path) contains:
- com
- img
---- bg.png
java contains:
JFrame f = new JFrame("Testing load resource from jar");
try {
BufferedImage bg = ImageIO.read(getClass().getResource("/img/bg.png"));
f.setContentPane(new ImagePanel(bg));
} catch (IOException e) {
e.printStackTrace();
}
Tested and working in both jar and unjarred (is that the technical term) execution.
BTW getClass().getClassLoader().getResourceAsStream("/img/bg.png") - which I tried first - returned me a null InputStream.
In netbeans 8.1 what I've done is to include the folder of icons and other images called Resources inside the src folder in the project file. So whenever i build Jar file the folder is included there.The file tree should be like this:
src (Java files in source packges are here)
** PACKAGE YOU NAMED IN PROJECT**
file.java
Resources
image.jpg
The code should be like:
jToggleButton1.setIcon(new javax.swing.ImageIcon(this.getClass().getResource("/resources/image.jpg")));
Load image in from Jar file during run time is the same as loading image when executed from IDE e.g netbeans the difference is that when loading image from JAR file the path must be correct and its case sensitive (very important).
This works for me
image1 = new javax.swing.ImageIcon(getClass().getResource("/Pictures/firstgame/habitat1.jpg"));
img = image1.getImage().getScaledInstance(lblhabitat1.getWidth(), lblhabitat1.getHeight(), Image.SCALE_SMOOTH);
lblhabitat1.setIcon(new ImageIcon(img));
if p in "/Pictures/firstgame/habitat1.jpg" is in lower case it wont work. check spaces, cases and spelling
When running a Java app from eclipse my ImageIcon shows up just fine.
But after creating a jar the path to the image obviously gets screwed up.
Is there a way to extract an image from the jar at runtime so I can then open it up? Or, is there a better way to do this?
I'd like to distribute a single jar file if possible.
To create an ImageIcon from an image file within the same jars your code is loaded:
new javax.swing.ImageIcon(getClass().getResource("myimage.jpeg"))
Class.getResource returns a URL of a resource (or null!). ImageIcon has a constructors that load from a URL.
To construct a URL for a resource in a jar not on your "classpath", see the documentation for java.net.JarURLConnection.
You can try something like:
InputStream stream = this.getClass().getClassLoader().getResourceAsStream("/images/image.jpg");
In your JAR file, you might have a directory structure of:
MyJAR.jar
- com (class files in here)
- images
----image.jpg
This is working for me to load and set the content pane background image:
jar (or build path) contains:
- com
- img
---- bg.png
java contains:
JFrame f = new JFrame("Testing load resource from jar");
try {
BufferedImage bg = ImageIO.read(getClass().getResource("/img/bg.png"));
f.setContentPane(new ImagePanel(bg));
} catch (IOException e) {
e.printStackTrace();
}
Tested and working in both jar and unjarred (is that the technical term) execution.
BTW getClass().getClassLoader().getResourceAsStream("/img/bg.png") - which I tried first - returned me a null InputStream.
In netbeans 8.1 what I've done is to include the folder of icons and other images called Resources inside the src folder in the project file. So whenever i build Jar file the folder is included there.The file tree should be like this:
src (Java files in source packges are here)
** PACKAGE YOU NAMED IN PROJECT**
file.java
Resources
image.jpg
The code should be like:
jToggleButton1.setIcon(new javax.swing.ImageIcon(this.getClass().getResource("/resources/image.jpg")));
Load image in from Jar file during run time is the same as loading image when executed from IDE e.g netbeans the difference is that when loading image from JAR file the path must be correct and its case sensitive (very important).
This works for me
image1 = new javax.swing.ImageIcon(getClass().getResource("/Pictures/firstgame/habitat1.jpg"));
img = image1.getImage().getScaledInstance(lblhabitat1.getWidth(), lblhabitat1.getHeight(), Image.SCALE_SMOOTH);
lblhabitat1.setIcon(new ImageIcon(img));
if p in "/Pictures/firstgame/habitat1.jpg" is in lower case it wont work. check spaces, cases and spelling
I'm trying to export a Java project to a Jar file but the images are not exporting with it.
This is the code to the image im using
static Icon logo = new ImageIcon("src/images/logo.png");
// LOGO
JLabel imageLogo = new JLabel(logoOne);
imageLogo.setPreferredSize(new Dimension(200, 50));
Ive read you need to factor it into the build path but even after i do that it still doesn't export. Do i need to change my code as well? Or am i factoring it into build path wrong?
Do i need to change my code as well?
Yep. That code is presuming the String to represent a path to a File.
By the time of deployment, it will likely become an embedded-resource.
That being the case, the resource must be accessed by URL instead of File. See the info page for the tag, for a way to form an URL.
Images not exporting to Jar file..
To check for sure, do something like:
jar -tvf the.jar
I am trying to fix this problem. Trying different solutions but nothing works. I am using NetBeans IDE. I created a project with this structure and files:
E:\java\project\ecadpb\src\ecadpb
The image files are in
E:\java\project\ecadpb\src\
I have specified working folder for my project in Netbeans as E:\java\project\ecadpb
I have created my image icons like this
new ImageIcon("device21.png");
In my source file, it works perfectly while running the project in Netbeans but images are not showing up when I build and run my JAR file separately. But the image files are inside the JAR.
I have also tried the answers for the same question asked previously.
URL imageUrl=getClass().getResource("device21.png");
new ImageIcon(imageUrl);
But it doesn't work in my case. I am building a JAR file for the first time. Can anyone help me with this!!
A simple way of doing this will be to add the image in your classpath or a directory in your classpath say img as shown below:
E:\java\project\ecadpb\src\main\java\img\device21.png
And then load your image from this location like this:
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
URL resource = classLoader.getResource("img/device21.png");
ImageIcon icon = new ImageIcon(resource);
Create a source folder called Images (ie if you're using eclipse, right-click your project -> new ->sourceFolder). Call it whatever you want, i called my Images. Put some images in it.
Now i had JLabels where i gave them ImageIcons. Look at the following code.
ImageIcon BPawn;
ImageIcon WPawn;
JLabel Label = new JLabel[8][8] //2D array of labels that gives each spot a position.
public void setPieces(){
//set up pawns in their respective positions.
BPawn = new ImageIcon("Images/BPawn.png", "BPawn");
WPawn = new ImageIcon("Images/WPawn.png", "WPawn");
for(int i=0;i<Label[0].length;i++){
Label[1][i].setIcon(BPawn);
Label[6][i].setIcon(WPawn);
}//end for
}//end setPieces.
There is a lot more in setPieces() method, but this glimpse is how you would reference the images in your source folder when you create an executable jar and want the images to show up.
I think answer could be one these suggestions here
I have used a similar approach,
a) Specify the package path to the image file name.
b) Make sure that the image file is not ommited by your build scripts and that it is present in your jar file.