Question

I want to unzip an iPhone app .ipa file.
This is actually zip file that extracts normally.
But the actual app file in it is a folder with the ending .app ( as all mac applications are actually folders with the ending .app).
Now the period seems to be a problem for java.util.zip.

public static void main(String[] args) throws IOException {
    ZipFile zipFile = new ZipFile("file.zip");
    String path = "";

    Enumeration files = zipFile.entries();

    while (files.hasMoreElements()) {
        ZipEntry entry = (ZipEntry) files.nextElement();
        if (entry.isDirectory()) {
            File file = new File(path + entry.getName());
            file.mkdir();
            System.out.println("Create dir " + entry.getName());
        } else {
            File f = new File(entry.getName());
            FileOutputStream fos = new FileOutputStream(f); //EXception occurs here
            InputStream is = zipFile.getInputStream(entry);
            byte[] buffer = new byte[1024];
            int bytesRead = 0;
            while ((bytesRead = is.read(buffer)) != -1) {
                fos.write(buffer, 0, bytesRead);
            }
            fos.close();
            System.out.println("Create File " + entry.getName());
        }
    }
}

This is my output:

Exception in thread "main" java.io.FileNotFoundException: Payload/SMA Jobs.app/06-magnifying-glass.png (No such file or directory)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
    at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
    at Main.main(Main.java:27)
    enter code here

Anyone knows how to handle those periods?

Answer 1

First of all, you should use mkdirs(), not mkdir().

second, zip files don’t always include all the directory entries (or have them in the right order). the best practice is to make the directories in both branches of the code, so add:

    } else {
        File f = new File(entry.getName());
        f.getParent().mkdirs();

(you should add some checking to make sure getParent() is not null, etc).