UnZipping an archive with folders inside

Question

Hello, everyone.
A friend of mine asked me to create him an "auto-downloader" type of program, to download a ZIP archive, then extract the information to the user's computer (no, it is not harmful).
Anyways, I've been trying mutliple ways, and I've come pretty far with the one I'm currently using. The only problem is, I'm using user.home as the file location for the zip, and creating a folder in there seems to just not want to work. This is the only way I could think of doing it, but I'm sure there are easier ways.. here's what I'm using:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
public class Updater extends Thread {
     private String name;
     public void get(String url, String fileName) {
          name = fileName;
          JFrame frame = new JFrame(name.replaceAll(".zip", "") + " update");
          frame.setLocationRelativeTo(null);
          frame.setLayout(new BorderLayout());
          frame.setPreferredSize(new Dimension(500, 80));
          frame.setResizable(false);
          frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
          Client client = new Client();
          ClassLoader cl = getClass().getClassLoader();
          try {
               URLConnection connection = (new URL(url)).openConnection();
               String f[] = url.split("/");
               File file = new File(f[f.length - 1]);
               int length = connection.getContentLength();
               InputStream instream = connection.getInputStream();
               try {
                    new File(updatedDirectory()).mkdir();
               } catch (Exception e) {
                    e.printStackTrace();
               FileOutputStream outstream = new FileOutputStream(updatedDirectory() + file);
               int size = 0;
               int copy = 0;
               JProgressBar bar = new JProgressBar();
               bar.setStringPainted(true);
               bar.setMaximum(length);
               frame.add(bar, "Center");
               frame.pack();
               frame.setVisible(true);
               while ((copy = instream.read()) != -1) {
                    outstream.write(copy);
                    size++;
                    int percentage = (int) (((double) size / (double) length) * 100D);
                    bar.setValue(size);
                    bar.setString("Updating your " + name.replaceAll(".zip", "") + " - " + percentage + "% complete");
               if (length != size) {
                    instream.close();
                    outstream.close();
               } else {
                    instream.close();
                    outstream.close();
                    unzip();
                    //System.exit(0);
                    frame.setVisible(false);
          } catch (Exception e) {
               System.err.println("Error connecting to update server.");
               e.printStackTrace();
     private void unzip() {
          try {
               System.out.println(updatedDirectory() + "animations\\raw");
               InputStream in = new BufferedInputStream(new FileInputStream(updatedDirectory() + name));
               ZipInputStream zin = new ZipInputStream(in);
               ZipEntry e;
               //new File(updatedDirectory() + name.replaceAll(".zip", "")).mkdir();
               if (!new File(updatedDirectory() + "animations\\raw").exists()) {
                    if (new File(updatedDirectory() + "animations\\raw").mkdir()) {
                         System.out.println("worked");
                    } else {
                         System.out.println("nope");
               while ((e = zin.getNextEntry()) != null) {
                    unzip(zin, updatedDirectory() + e.getName());
               zin.close();
          } catch (Exception e) {
               e.printStackTrace();
     private void unzip(ZipInputStream zin, String s) throws IOException {
          FileOutputStream out = new FileOutputStream(s);
          byte[] b = new byte[1024];
          int len = 0;
          while ((len = zin.read(b)) != -1) {
               out.write(b, 0, len);
          out.close();
     public final String updatedDirectory() {
          //File file = new File(System.getProperty("user.home") + "\\info\\");
          File file = new File("..\\");
          if (file.exists() || file.mkdir()) {
               //return System.getProperty("user.home") + "\\info\\";
               return "..\\";
          return null;
}Here's the ZIP archive I'm trying to download: http://www.2shared.com/file/Qu1cSWcl/cache.html
If what I've said before doesn't make sense (mind you me, it's 4 am and I'm about to crawl into bed), then I'll try to sum it up in a few short words below.
I'm trying to extract a ZIP archive with folders, every time I do, it stops halfway through and throws an error similar to this:
invalid cache index specified
..\animations\raw
java.io.FileNotFoundException: ..\animations\raw (The system cannot find the pat
h specified)
        at java.io.FileOutputStream.open(Native Method)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
        at java.io.FileOutputStream.<init>(FileOutputStream.java:70)
        at Updater.unzip(Updater.java:99)
        at Updater.unzip(Updater.java:90)
        at Updater.get(Updater.java:64)
        at Client.main(Client.java:2548)
Press any key to continue . . .I'm just trying to be able to extract cache (ZIP ARCHIVE) which has folders inside. I've tried creating a directory for the folder, but it seems to not work, hence the "?" in the above error (i printed that if the directory failed to create a new directory, as seen in my above code). Once again, sorry if this isn't as understandable as it should be, I'm not myself without sleep :)
Also, do ignore the first print, 'invalid cache index specified', it's not related to the problem.
Edited by: aeternaly on Jul 2, 2010 4:04 AM

Answer 1

So your question is really about how to make a directory, then. Nothing at all to do with unzipping of archives.
If you can't create a directory, then perhaps there is some permissions problem. You don't have the authority to create directories in some directory. Or perhaps you're trying to use a name which isn't a valid directory name in your system. Or... there are many other possibilities. But anyway I recommend tossing all of that unzipping business out of your program and just trying to write something which creates a directory. Debug that first.