Java Unzip File unzip(File epubfile, File destination)

Description

Unpacks the given epubfile to the destination directory.

License

Open Source License

Parameter

Parameter	Description
epubfile	the EPUB file
destination	the destination folder

Exception

Parameter	Description
FileNotFoundException	when EPUB file does not exist
IOException	if the operation was unsuccessful

Declaration

public static void unzip(File epubfile, File destination)
        throws IOException 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2011-2014 Torkild U. Resheim.
 *
 * All rights reserved. This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License v1.0 which
 * accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors://w w  w.  ja  v  a2s .  co  m
 *   Torkild U. Resheim - initial API and implementation
 *******************************************************************************/

import java.io.File;
import java.io.FileInputStream;

import java.io.FileOutputStream;
import java.io.IOException;

import java.util.zip.ZipEntry;

import java.util.zip.ZipInputStream;

public class Main {
    static final int BUFFERSIZE = 2048;

    /**
     * Unpacks the given <i>epubfile</i> to the <i>destination</i> directory. This method will also validate the first
     * item contained in the EPUB (see {@link #writeEPUBHeader(ZipOutputStream)}).
     * <p>
     * If the destination folder does not already exist it will be created. Additionally the modification time stamp of
     * this folder will be set to the same as the originating EPUB file.
     * </p>
     * TODO: Actually validate the mimetype file
     *
     * @param epubfile
     *            the EPUB file
     * @param destination
     *            the destination folder
     * @throws FileNotFoundException
     *             when EPUB file does not exist
     * @throws IOException
     *             if the operation was unsuccessful
     */
    public static void unzip(File epubfile, File destination)
            throws IOException {
        if (!destination.exists()) {
            if (!destination.mkdirs()) {
                throw new IOException(
                        "Could not create directory for EPUB contents"); //$NON-NLS-1$
            }
        }
        ZipInputStream in = new ZipInputStream(
                new FileInputStream(epubfile));
        byte[] buf = new byte[BUFFERSIZE];
        ZipEntry entry = null;
        while ((entry = in.getNextEntry()) != null) {
            // for each entry to be extracted
            String entryName = entry.getName();
            File newFile = new File(destination.getAbsolutePath()
                    + File.separator + entryName);
            if (entry.isDirectory()) {
                newFile.mkdirs();
                if (entry.getTime() > 0) {
                    newFile.setLastModified(entry.getTime());
                }
                continue;
            } else {
                newFile.getParentFile().mkdirs();
            }
            int n;
            FileOutputStream fileoutputstream = new FileOutputStream(
                    newFile);
            while ((n = in.read(buf, 0, BUFFERSIZE)) > -1) {
                fileoutputstream.write(buf, 0, n);
            }
            fileoutputstream.close();
            in.closeEntry();
            // Update the file modification time
            if (entry.getTime() > 0) {
                newFile.setLastModified(entry.getTime());
            }
        } // iterate over contents
        in.close();
        destination.setLastModified(epubfile.lastModified());
    }
}

Related

1. unzip(File archiveFile, File destination)
2. unzip(File archiveFile, File destination)
3. unzip(File archiveFile, File targetDir, boolean skipRoot)
4. unzip(File dest, String jar)
5. unzip(File destDir, InputStream is)
6. unzip(File file, File dest)
7. unzip(File file, File destDir)
8. unzip(File file, File directory)
9. unzip(File file, File targetDirectory)