Unzipping Files in Folder using Java

Question

Hello,
I am working on a project and I am having trouble writing a program that will unzip all the files in a given directory (using Java). The directory is known, but the name and number of files to be unzipped will vary on each execution. The files need to be unzipped and then placed in a different specified folder.
Thank you for your assistance.

Answer 1

This should give you some idea. Be sure to import java.util.zip.
    /** unzipDirArchive */
    public static void unzipDirArchive(File inFile)
        throws IOException {
        ZipEntry entry = null;
        // Create stream to read the compressed file.
        ZipInputStream zis = new ZipInputStream(new FileInputStream((inFile)));
        // Create stream to write the output file.
        FileOutputStream fos = null;
        byte buffer[] = new byte[4096];
        int bytesRead;
        boolean dirCreated = false;
        // For each entry in the ZIP input file.
        while ((entry = zis.getNextEntry()) != null) {
            // If we have not created the enclosing directory.
            if (!dirCreated) {
                // Create the directory.
                int endIndex = entry.getName().lastIndexOf('/');
                String dirName = entry.getName().substring(0, endIndex);
                // DEBUG
                // System.out.println("dirName is: " + dirName + ".");
                File newDir = new File(dirName);
                // Check if the output dir already exists.
                if (newDir.exists()) {
                    System.err.println("Uncompress: Output directory " + dirName +
                                       " already exists.");
                    System.exit(-5);
                else {
                    // If we successfully created the enclosing directory.
                    if (newDir.mkdir()) {
                        dirCreated = true;
                    else {
                        System.err.println("Uncompress: Cannot create directory " +
                                            dirName + ".");
                        System.exit(-6);
                } // end if newDir.exists
            } // end if !dirCreated
            System.out.println("Inflating: " + entry.getName());
            fos = new FileOutputStream(entry.getName());
            // Copy the data from the ZIP file entry to a file.
            while((bytesRead = zis.read(buffer)) != -1)
                fos.write(buffer, 0, bytesRead);
            fos.close();
        } // end while more entries in the ZIP file
        zis.close();
    } // end method unzipDirArchive