在可运行的jar中导出图像不起作用

Question

I'm having a weird problem in java. I want to create a runnable jar: This is my only class:

public class Launcher {

public Launcher() {
    // TODO Auto-generated constructor stub
}

public static void main(String[] args) {
    String path = Launcher.class.getResource("/1.png").getFile();
    File f = new File(path);
    JOptionPane.showMessageDialog(null,Boolean.toString(f.exists()));

}

}

As you can see it just outputs if it can find the file or not. It works fine under eclipse (returns true). i've created a source folder resources with the image 1.png. (resource folder is added to source in build path)

As soon as I export the project to a runnable jar and launch it, it returns false. I don't know why. Somebody has an idea? Thanks in advance

edit: I followed example 2 to create the resources folder: Eclipse exported Runnable JAR not showing images

Answer 1

If you would like to load resources from your .jar file use getClass().getResource() . That returns a URL with correct path.

Image icon = ImageIO.read(getClass().getResource("image´s path"));

To access images in a jar, use Class.getResource() .

I typically do something like this:

InputStream stream = MyClass.class.getResourceAsStream("Icon.png");
if(stream == null) {
   throw new RuntimeException("Icon.png not found.");
}

try {
   return ImageIO.read(stream);
} catch (IOException e) {
   throw new RuntimeException(e);
} finally {
   try {
      stream.close();
   } catch(IOException e) { }
}

Still you're understand, Kindly go through this link.

Eclipse exported Runnable JAR not showing images

Answer 2

Because the image is not separate file but packed inside the .jar.

Use the code to create the image from stream

InputStream is=Launcher.class.getResourceAsStream("/1.png");
Image img=ImageIO.read(is);

Answer 3

尝试使用它来获取图像

InputStream input = getClass().getResourceAsStream("/your image path in jar");

Answer 4

Two Simple steps:

1 - Add the folder ( where the image is ) to Build Path;

2 - Use this:

InputStream url = this.getClass().getResourceAsStream("/load04.gif");
myImageView.setImage(new Image(url));