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POHow to copy a file (image.gif) from my ".jar" to a folder?
 

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  1. POHow to copy a file (image.gif) from my ".jar" to a folder?
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    <p>I've an image in my .jar (program.jar/resources/img/image.gif) and I would want to invoke a methot at the the beggining of my main to copy them to "C:\folder". It should check if the file "C:\folder\image.gif" exist, and, if not, copy it. I've researched about this topic, but I can't find a way to do it. This is what I have, and it works... but it creates an empty file (image.gif) whit 0 bytes. It creates <strong>a</strong> file, not <strong>the</strong> file from my .jar.</p> <h3>Code:</h3> <pre><code>//MyResources.saveResource("/resources/img/image.gif", "C:\folder", "image.gif"); public static void saveResource(String fromFile, String toFolder, String toFile){ InputStream stream = MyResources.class.getResourceAsStream(fromFile); if (stream == null) { //send your exception or warning } OutputStream resStreamOut; int readBytes; byte[] buffer = new byte [4096]; try { resStreamOut = new FileOutputStream(new File (toFolder + File.separator + toFile)); while ((readBytes = stream.read(buffer)) != -1){ //LINE 80 resStreamOut.write (buffer, 0, readBytes); } } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } </code></pre> <p>I also get an error (a NullPointerException that explains why the files are empty, but I don't know how o solve): </p> <pre><code>Exception in thread "main" java.lang.NullPointerException at com.github.CrafterPGSV.Chess.Library.MyResources.saveResource(MyResources.java:80) at com.github.CrafterPGSV.Chess.Library.MyResources.createFolders(MyResources.java:61) at com.github.CrafterPGSV.Chess.Chess.main(Chess.java:10) </code></pre> <p>My main calls "MyResources.createFolders();" which create the folder if it doesn't exist. At the end of "createFolders", it calls "saveResources(...)" to save the image.</p>
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      1. POHow to copy a file (image.gif) from my ".jar" to a folder?
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      1. VTUpMod
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    1. COwhich one is line 80? Btw. you should close the streams appropriate.
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      1. POHow to copy a file (image.gif) from my ".jar" to a folder?
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    2. COI would guess `stream` is null. You should implement the `if`-block where this is checked.
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      1. POHow to copy a file (image.gif) from my ".jar" to a folder?
      1. USKai
    3. COTry accessing your image without a leading /, i.e. "resources/img/image.gif". Also make sure to close your streams, as some of the other folks already advised :-)
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      1. POHow to copy a file (image.gif) from my ".jar" to a folder?
      1. USGyro Gearless
 

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