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PODirectory listing not refreshing
 

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    <p>This is driving me crazy! I have a panel that displays a list of files from a directory. The list is stored in a vector. When I click on a button, a new file is created in the same directory and the list needs to be refreshed. </p> <p>I don't understand why Java cannot see the new file, even though if I add a good old DIR in Dos, Dos can see the file. It's as if the new file is invisible even though I can see it and Dos can see it. I tried giving it some time (sleep, yield) but it's no use. I also tried copying to a new temp file and reading the temp but again to no avail. Here's some code (removed some irrelevant lines):</p> <pre><code>public class Button extends EncapsulatedButton { public Button() { super("button pressed"); } public void actionPerformed(ActionEvent arg0) { //removed function here where the new file is created in the directory //remove call to DOS that regenerates /myFileList.txt after a new file was added in the directory //at this point, DOS can see the new file and myFileList.txt is updated, however it is read by java without the update!!!!! //now trying to read the directory after the new file was created Vector data = new Vector&lt;String&gt;(); String s = null; // Create the readers to read the file. try { File f = new File("/myFileList.txt"); BufferedReader stream = new BufferedReader(new InputStreamReader(new FileInputStream(f))); while((s = stream.readLine()) != null) { data.addElement(s.trim()); } stream.close(); } catch (IOException e) { e.printStackTrace(); } util(); } void util(){ //giving it time is not helping Thread.yield(); try { Thread.sleep(10000); } catch (InterruptedException e1) { e1.printStackTrace(); } //get the file listing through java instead of DOS - still invisible File fLocation = new File("/myDir"); File[] filesFound = fLocation.listFiles(); for (int i = 0; i &lt; filesFound.length; i++) { if (filesFound[i].isFile()) { System.out.println("**********" + filesFound[i].getName()); } } //last resort: copy to a temp then read from there - still not good try{ //copy to a temp file File inputFile = new File("/myFileList.txt"); File outputFile = new File("/myFileList_temp.txt"); FileReader in = new FileReader(inputFile); FileWriter out = new FileWriter(outputFile); int c; while ((c = in.read()) != -1) out.write(c); in.close(); out.close(); //read the copy to see if it is updated // Open the file that is the first // command line parameter FileInputStream fstream = new FileInputStream("/myFileList_temp.txt"); // Get the object of DataInputStream DataInputStream in1 = new DataInputStream(fstream); BufferedReader br = new BufferedReader(new InputStreamReader(in1)); String strLine; //Read File Line By Line while ((strLine = br.readLine()) != null) { // Print the content on the console System.out.println ("Test file read: " + strLine); } //Close the input stream in1.close(); }catch (Exception e){//Catch exception if any System.err.println("Error: " + e.getMessage()); } } } </code></pre> <p>I would appreciate any leads. Thank you.</p> <p>myFileList.txt lokks like this:</p> <pre><code>myline1 myline2 myline3 </code></pre> <p>After adding a new file in the folder,</p> <p>myline4 should appear in it, then it will be read and displayed in the panel.</p>
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    1. USalex
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    1. COWhere exactly are you trying to read this file from? Really the root directory? And what is /myDir?
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    2. COThe files and directories are dynamically generated at run time. The locations presented here are just dummy replacements, in the local dir. The codebase is quite complex, but I thought this would be a good approximation. At any rate, it is not a case of reading the wrong file or wrong directory. I can see the files opened in a text editor and they have the new line added.
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      1. USalex
    3. COWhy, in gods name, don't you simply read the directory /the File class has a method for this), instead of a file where the directory contents is supposedly listed?
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      1. USIngo
 

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