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Thread: Add Image to JPanel

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    Default Add Image to JPanel

    What is the best way to simply add an image in the local directory to a JPanel? The JPanel fills the entire JFrame.

    I have been trying multiple methods and none of them have worked. I, for some reason, just can't get an image to be displayed.

    Again I am looking for a simple way to briefly display a large .jpg image filling the whole JFrame.

    Thanks.


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    Super Moderator Norm's Avatar
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    Default Re: Add Image to JPanel

    Override the JPanel's paintComponent method and draw the image there.

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    Default Re: Add Image to JPanel

    Yeah I got that to work but do you know of a way to make a general path identification for a file (not system specific) or better yet, a way to include a file (as in picture) in a package?

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    Default Re: Add Image to JPanel

    look at the format here and see if this helps you out.
    [java-swing-how-to-add-an-image-to-a-jpanel

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    Super Moderator Norm's Avatar
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    Default Re: Add Image to JPanel

    a way to include a file (as in picture) in a package?
    Not sure what you mean by package? Are you referring to a jar file?
    Your first post stated: image in the local directory

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    Default Re: Add Image to JPanel

    Quote Originally Posted by Norm View Post
    Not sure what you mean by package? Are you referring to a jar file?
    Your first post stated: image in the local directory
    Right now the path has to be specified exactly like so:
    //code back here...
    Image iScreen = new ImageIcon("C:\\Java Workspace\\JavaCalcIntroScreen.jpg");

    I just want to tell java to look in the local directory for the .jpg file or, when a jar is made with all the classes, have it find the jpeg in the jar (I would store the jpeg in the jar with the class files).

    The only reason I mentioned packages is because I've seen a lot of source code where the programmer had pictures inside of the jar within folders that the program used. I don't know if those count as packages or not... doesn't matter. That would be great if I knew how to do that.

    Clarification:
    -I DON'T want the JVM trying to find the file based on a specific path for my system only.
    -I WANT the JVM to either look in the local directory for the file, or, most ideally, look for it within the executable jar.
    -Alternatively, I would certainly accept a simple method of typing a file name that specifies the local location (i.e. some sort of wildcard or something like in batch files when you use %USERPROFILE%\<rest of path>

    Thanks again!

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    Default Re: Add Image to JPanel

    I haven't checked back on my previous programs (I will if this doesn't work), but I seem to remember doing this:
    InputStream is = this.getClass().getClassLoader().getResourceAsStream("yourFileInJarOrLocalPath.file");

    Since jars are compressed folders (essentially), you have to access files within them with Streams instead of standard file IO. I believe the above thing will work the same for local files.
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    Default Re: Add Image to JPanel

    In addition to Norm's suggestion (which is probably the way I would go), you could also add the Icon to a JLabel and add that to the JPanel.

    Recommended reading: How to Use Icons (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components) That also contains some information on loading an icon.
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    Default Re: Add Image to JPanel

    Quote Originally Posted by aussiemcgr View Post
    I haven't checked back on my previous programs (I will if this doesn't work), but I seem to remember doing this:
    InputStream is = this.getClass().getClassLoader().getResourceAsStream("yourFileInJarOrLocalPath.file");

    Since jars are compressed folders (essentially), you have to access files within them with Streams instead of standard file IO. I believe the above thing will work the same for local files.
    Should I return that to a BufferedImage variable?

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    Default Re: Add Image to JPanel

    You need to find a constructor or method that takes an input stream that is reading an image and returns an image object of some kind.

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    Default Re: Add Image to JPanel

    Quote Originally Posted by Norm View Post
    You need to find a constructor or method that takes an input stream that is reading an image and returns an image object of some kind.
    Hmm. Would that be in javax.imageio maybe? I will go check.

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