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    <p>I see 2 problems in your code,</p> <ol> <li>You don't save the directory path so there is no way to get it back.</li> <li>On Windows, you need to use "/" as path separator. Some unzip program doesn't like \.</li> </ol> <p>I include my own version for your reference. We use this one to zip up photos to download so it works with various unzip programs. It preserves the directory structure and timestamps. </p> <pre><code> public static void createZipFile(File srcDir, OutputStream out, boolean verbose) throws IOException { List&lt;String&gt; fileList = listDirectory(srcDir); ZipOutputStream zout = new ZipOutputStream(out); zout.setLevel(9); zout.setComment("Zipper v1.2"); for (String fileName : fileList) { File file = new File(srcDir.getParent(), fileName); if (verbose) System.out.println(" adding: " + fileName); // Zip always use / as separator String zipName = fileName; if (File.separatorChar != '/') zipName = fileName.replace(File.separatorChar, '/'); ZipEntry ze; if (file.isFile()) { ze = new ZipEntry(zipName); ze.setTime(file.lastModified()); zout.putNextEntry(ze); FileInputStream fin = new FileInputStream(file); byte[] buffer = new byte[4096]; for (int n; (n = fin.read(buffer)) &gt; 0;) zout.write(buffer, 0, n); fin.close(); } else { ze = new ZipEntry(zipName + '/'); ze.setTime(file.lastModified()); zout.putNextEntry(ze); } } zout.close(); } public static List&lt;String&gt; listDirectory(File directory) throws IOException { Stack&lt;String&gt; stack = new Stack&lt;String&gt;(); List&lt;String&gt; list = new ArrayList&lt;String&gt;(); // If it's a file, just return itself if (directory.isFile()) { if (directory.canRead()) list.add(directory.getName()); return list; } // Traverse the directory in width-first manner, no-recursively String root = directory.getParent(); stack.push(directory.getName()); while (!stack.empty()) { String current = (String) stack.pop(); File curDir = new File(root, current); String[] fileList = curDir.list(); if (fileList != null) { for (String entry : fileList) { File f = new File(curDir, entry); if (f.isFile()) { if (f.canRead()) { list.add(current + File.separator + entry); } else { System.err.println("File " + f.getPath() + " is unreadable"); throw new IOException("Can't read file: " + f.getPath()); } } else if (f.isDirectory()) { list.add(current + File.separator + entry); stack.push(current + File.separator + f.getName()); } else { throw new IOException("Unknown entry: " + f.getPath()); } } } } return list; } } </code></pre>
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    1. POjava.util.zip - Recreating directory structure
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    1. COThank you for your contribution. I am grateful for your code example but I am not sure how it will help me find the error in my code as; the initial call to the function is with the full directory path which will then be handed down in the function and secondly; my SEPARATOR constant is initialised with the System.getProperty("file.separator") which will give me the OS default file separator. I would never hardcode a separator since that assumes that your code will only be deployed on a given OS.
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    2. CODon't use File.separator in ZIP. The separator must be "/" according to the spec. If you are on Windows, you must open file as "D:\dir\subdir\file" but ZIP entry must be "dir/subdir/file".
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    3. COI see. Thank you for pointing this out. Did not know that ZIP was so picky! :)
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