如何在Java中递归解压缩文件？

Question

我有zip文件,其中包含一些其他的zip文件.

例如,邮件文件abc.zip,它包含xyz.zip,class1.java,class2.java.并xyz.zip包含文件class3.java和class4.java.

所以,我需要提取使用Java应包含一个文件夹中的zip文件class1.java,class2.java,class3.java和class4.java.

Answer 1

警告,此处的代码适用于受信任的zip文件,在写入之前没有路径验证,这可能导致安全漏洞,如zip-slip-vulnerability中所述,如果您使用它来从未知客户端收集上传的zip文件.

此解决方案与之前发布的解决方案非常相似,但是这一解决方案在解压缩时重新创建了正确的文件夹结构.

static public void extractFolder(String zipFile) throws ZipException, IOException 
{
    System.out.println(zipFile);
    int BUFFER = 2048;
    File file = new File(zipFile);

    ZipFile zip = new ZipFile(file);
    String newPath = zipFile.substring(0, zipFile.length() - 4);

    new File(newPath).mkdir();
    Enumeration zipFileEntries = zip.entries();

    // Process each entry
    while (zipFileEntries.hasMoreElements())
    {
        // grab a zip file entry
        ZipEntry entry = (ZipEntry) zipFileEntries.nextElement();
        String currentEntry = entry.getName();
        File destFile = new File(newPath, currentEntry);
        //destFile = new File(newPath, destFile.getName());
        File destinationParent = destFile.getParentFile();

        // create the parent directory structure if needed
        destinationParent.mkdirs();

        if (!entry.isDirectory())
        {
            BufferedInputStream is = new BufferedInputStream(zip
            .getInputStream(entry));
            int currentByte;
            // establish buffer for writing file
            byte data[] = new byte[BUFFER];

            // write the current file to disk
            FileOutputStream fos = new FileOutputStream(destFile);
            BufferedOutputStream dest = new BufferedOutputStream(fos,
            BUFFER);

            // read and write until last byte is encountered
            while ((currentByte = is.read(data, 0, BUFFER)) != -1) {
                dest.write(data, 0, currentByte);
            }
            dest.flush();
            dest.close();
            is.close();
        }

        if (currentEntry.endsWith(".zip"))
        {
            // found a zip file, try to open
            extractFolder(destFile.getAbsolutePath());
        }
    }
}

Answer 2

这里有一些未经测试的代码基于我解压缩文件的一些旧代码.

public void doUnzip(String inputZip, String destinationDirectory)
        throws IOException {
    int BUFFER = 2048;
    List zipFiles = new ArrayList();
    File sourceZipFile = new File(inputZip);
    File unzipDestinationDirectory = new File(destinationDirectory);
    unzipDestinationDirectory.mkdir();

    ZipFile zipFile;
    // Open Zip file for reading
    zipFile = new ZipFile(sourceZipFile, ZipFile.OPEN_READ);

    // Create an enumeration of the entries in the zip file
    Enumeration zipFileEntries = zipFile.entries();

    // Process each entry
    while (zipFileEntries.hasMoreElements()) {
        // grab a zip file entry
        ZipEntry entry = (ZipEntry) zipFileEntries.nextElement();

        String currentEntry = entry.getName();

        File destFile = new File(unzipDestinationDirectory, currentEntry);
        destFile = new File(unzipDestinationDirectory, destFile.getName());

        if (currentEntry.endsWith(".zip")) {
            zipFiles.add(destFile.getAbsolutePath());
        }

        // grab file's parent directory structure
        File destinationParent = destFile.getParentFile();

        // create the parent directory structure if needed
        destinationParent.mkdirs();

        try {
            // extract file if not a directory
            if (!entry.isDirectory()) {
                BufferedInputStream is =
                        new BufferedInputStream(zipFile.getInputStream(entry));
                int currentByte;
                // establish buffer for writing file
                byte data[] = new byte[BUFFER];

                // write the current file to disk
                FileOutputStream fos = new FileOutputStream(destFile);
                BufferedOutputStream dest =
                        new BufferedOutputStream(fos, BUFFER);

                // read and write until last byte is encountered
                while ((currentByte = is.read(data, 0, BUFFER)) != -1) {
                    dest.write(data, 0, currentByte);
                }
                dest.flush();
                dest.close();
                is.close();
            }
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
    }
    zipFile.close();

    for (Iterator iter = zipFiles.iterator(); iter.hasNext();) {
        String zipName = (String)iter.next();
        doUnzip(
            zipName,
            destinationDirectory +
                File.separatorChar +
                zipName.substring(0,zipName.lastIndexOf(".zip"))
        );
    }

}

Answer 3

我拿ca.anderson4并删除List zipFiles并重写一点,这就是我得到的:

public class Unzip {

public void unzip(String zipFile) throws ZipException,
        IOException {

    System.out.println(zipFile);;
    int BUFFER = 2048;
    File file = new File(zipFile);

    ZipFile zip = new ZipFile(file);
    String newPath = zipFile.substring(0, zipFile.length() - 4);

    new File(newPath).mkdir();
    Enumeration zipFileEntries = zip.entries();

    // Process each entry
    while (zipFileEntries.hasMoreElements()) {
        // grab a zip file entry
        ZipEntry entry = (ZipEntry) zipFileEntries.nextElement();

        String currentEntry = entry.getName();

        File destFile = new File(newPath, currentEntry);
        destFile = new File(newPath, destFile.getName());
        File destinationParent = destFile.getParentFile();

        // create the parent directory structure if needed
        destinationParent.mkdirs();
        if (!entry.isDirectory()) {
            BufferedInputStream is = new BufferedInputStream(zip
                    .getInputStream(entry));
            int currentByte;
            // establish buffer for writing file
            byte data[] = new byte[BUFFER];

            // write the current file to disk
            FileOutputStream fos = new FileOutputStream(destFile);
            BufferedOutputStream dest = new BufferedOutputStream(fos,
                    BUFFER);

            // read and write until last byte is encountered
            while ((currentByte = is.read(data, 0, BUFFER)) != -1) {
                dest.write(data, 0, currentByte);
            }
            dest.flush();
            dest.close();
            is.close();
        }
        if (currentEntry.endsWith(".zip")) {
            // found a zip file, try to open
            unzip(destFile.getAbsolutePath());
        }
    }
}

public static void main(String[] args) {
    Unzip unzipper=new Unzip();
    try {
        unzipper.unzip("test/test.zip");
    } catch (ZipException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

}

我测试过它的确有效

Answer 4

File dir = new File("BASE DIRECTORY PATH");
FileFilter ff = new FileFilter() {

    @Override
    public boolean accept(File f) {
        //only want zip files
        return (f.isFile() && f.getName().toLowerCase().endsWith(".zip"));
    }
};

File[] list = null;
while ((list = dir.listFiles(ff)).length > 0) {
    File file1 = list[0];
    //TODO unzip the file to the base directory
}