Hi,

I'm currently developing an application which, among other things,
should zip some folders with all their content (therefore, also
subfolders).
Browsing I found and slightly adapted the following code:

public class ZipUtil {
  private ZipOutputStream cpZipOutputStream = null;
  private String strSource = "";
  private String strTarget = "";
  private String strSubstring = "";

  public void ZipDirectory (String dir2zip, String destFile){
     strSource = dir2zip;
     strTarget = destFile;
     zip();
  }

  private void zip(){
     try{
        File cpFile = new File (strSource);
    if (!cpFile.isFile() && !cpFile.isDirectory() ) {
           System.out.println("\nSource file/directory Not Found!");
           return;
        }
        if  (cpFile.isDirectory()) {
           strSubstring = strSource;
        } else {
           strSubstring = "";
        }
    FileOutputStream fos = new FileOutputStream(strTarget);
        cpZipOutputStream = new ZipOutputStream(fos);
        cpZipOutputStream.setLevel(9);
        zipFiles(cpFile);
        cpZipOutputStream.finish();
        cpZipOutputStream.close();
        fos.close();
     }catch (Exception e){
        e.printStackTrace();
     }
  }

  private void  zipFiles(File cpFile) {
     if (cpFile.isDirectory()) {
        File [] fList = cpFile.listFiles() ;
        for (int i=0; i< fList.length; i++){
           zipFiles(fList[i]) ;
        }
     } else {
        try {
           String strAbsPath = cpFile.getAbsolutePath();
           String strZipEntryName ="";
           if (!strSubstring.equals("") ){

                 strZipEntryName  = strAbsPath.substring(
                 strSource.length()+1, strAbsPath.length());

           } else {
              strZipEntryName  = cpFile.getName();
           }
           byte[] b = new byte[ (int)(cpFile.length()) ];
           FileInputStream cpFileInputStream =
              new FileInputStream (cpFile) ;
           cpFileInputStream.read(b, 0, (int)cpFile.length());
           ZipEntry cpZipEntry = new ZipEntry(strZipEntryName);
           cpZipOutputStream.putNextEntry(cpZipEntry );
           cpZipOutputStream.write(b, 0, (int)cpFile.length());
           cpZipOutputStream.closeEntry() ;
           cpFileInputStream.close();
        } catch (Exception e) {
           e.printStackTrace();
        }
     }
  }
}

The problem is that when I run this on Windows, the following line:

strZipEntryName  = strAbsPath.substring(strSource.length()+1,
strAbsPath.length());

uses the backslash as File.separator. So the zip file contains all the
folders and subfolders when I extract the zip file on Windows.
On the other hand, if I try to extract on a Mac, it will consider the
backslash as part of the filename.

e.g.
folder\foo.bar

On Windows it's a folder with a foo.bar file inside.
On Mac, it is a file named "folder\foo".

Am I wrong somewhere, or is there any workaround for this problem?
I'd like my zip files to be as portable as my application :)

Thanks in advance for your answer!

gianpi