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POHow to access files within folders within jar files?
 

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  1. POHow to access files within folders within jar files?
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    <p>I have looked at <a href="https://stackoverflow.com/questions/2393194/how-to-access-resources-in-jar-file">How to access resources in JAR file?</a> and <a href="https://stackoverflow.com/questions/463972/how-do-i-copy-a-text-file-from-a-jar-into-a-file-outside-of-the-jar">How do I copy a text file from a jar into a file outside of the jar?</a> and many other questiions but couldnt actually get an answer. What I'm trying to do is copy contents of a file in <code>res/CDC.txt</code> that is in jar, to somewhere out of a jar. Now, on my computer it works but when I try it on different computer I get <code>FileNotFoundException</code>. So, I figured out why it works on mine. I have a CLASSPATH set to <code>.;D:\myname\Java\JavaFiles</code> where all my java files are located in packages. In "JavaFiles" directory there is also "res/CDC.txt". So, when I start my application, it first checks the current directory myapp.jar is located in for "res/CDC.txt", and then it checks "JavaFiles" and finds it. Other computers do not have it. So, this was my initial code:</p> <pre><code>public final class CT { //Other fields private static CT ct; private NTSystem nts; private File f1; private File f6; private PrintWriter pw1; private BufferedReader br1; //Other fields public static void main(String[] args) { try { showMessage("Executing program..."); ct = new CT(); ct.init(); ct.create(); ct.insertData(); //Other code showMessage("Program executed!"); } catch(Exception e) { showMessage("An exception occured! Program closed."); e.printStackTrace(); System.exit(0); } } private void init() throws IOException { //Other initialization nts = new NTSystem(); f1 = new File("C:\\Users\\" + nts.getName() + "\\blahblah"); f6 = new File("res\\CDC.txt"); br1 = new BufferedReader(new FileReader(f6)); //Other initialization showMessage("Initialized"); } private void create() throws IOException { //Makes sure file/dir exists, etc pw1 = new PrintWriter(new BufferedWriter(new FileWriter(f1)), true); //Other Stuff showMessage("Created"); } private void insertData() throws IOException { String line = br1.readLine(); while(line != null) { pw1.println(line); line = br1.readLine(); } //Other stuff showMessage("Data inserted"); } private static void showMessage(String msg) { System.out.println(msg); } } </code></pre> <p>which I changed to</p> <pre><code>public final class CT { //Other fields private static CT ct; private NTSystem nts; private byte[] buffer; private File f1; private URL url1; private FileOutputStream fos1; private InputStream is1; //Other fields public static void main(String[] args) { try { showMessage("Executing program..."); ct = new CT(); ct.init(); ct.create(); ct.insertData(); //Other code showMessage("Program executed!"); } catch(Exception e) { showMessage("An exception occured! Program closed."); e.printStackTrace(); System.exit(0); } } private void init() throws IOException { //Other initialization nts = new NTSystem(); buffer = new byte[4096]; f1 = new File("C:\\Users\\" + nts.getName() + "\\blahblah"); url1 = getClass().getClassLoader.getResource("res\\CDC.txt"); //Also tried url1 = ct.getClass().getClassLoader.getResource("res\\CDC.txt"); or url1 = this.getClass().getClassLoader.getResource("res\\CDC.txt"); or url1 = CT.getClass().getClassLoader.getResource("res\\CDC.txt"); is1 = url1.openStream(); //Other initialization showMessage("Initialized"); } private void create() throws IOException { //Makes sure file/dir exists, etc pw1 = new PrintWriter(new BufferedWriter(new FileWriter(f1)), true); //Other Stuff showMessage("Created"); } private void insertData() throws IOException { int read = is1.read(buffer); while(line != null) { fos1.write(buffer, 0, read); read = is1.read(buffer); } //Other stuff showMessage("Data inserted"); } private static void showMessage(String msg) { System.out.println(msg); } } </code></pre> <p>And this time I always get <code>NullPointerException</code>. So, how to read folders and files that are within jar?</p> <p>Thanks</p>
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    1. PTQuestion
    1. USCommunity
    1. USFranko Leon Tokalić
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      1. LTLinked
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      1. POHow to access files within folders within jar files?
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      1. VTUpMod
    1. COwhat about using / instead of \\ when searching in the jar ?
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      1. POHow to access files within folders within jar files?
      1. USValentin Rocher
    2. COTried that, same thing
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      1. POHow to access files within folders within jar files?
      1. USFranko Leon Tokalić
    3. COAre you aware of the fact that you are specifying the in-jar-path relative to the package the CT class is located in? Better to use the path `getResource("/res/CDC.txt")`
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      1. POHow to access files within folders within jar files?
      1. USRobert
 

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