Java Unzip File unzip(File file, File targetDirectory)

Description

Unzip a file to a specified directory

License

Open Source License

Declaration

public static void unzip(File file, File targetDirectory) throws Exception 

Method Source Code

//package com.java2s;
/**//from  w w  w .  jav  a2s  .  c  om
 * e-Science Central
 * Copyright (C) 2008-2013 School of Computing Science, Newcastle University
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation at:
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301, USA.
 */

import java.io.*;
import java.util.zip.*;
import java.util.*;

public class Main {
    /** Unzip a file to a specified directory */
    public static void unzip(File file, File targetDirectory) throws Exception {
        Enumeration<? extends ZipEntry> entries;
        ZipFile zipFile = new ZipFile(file);
        try {
            File extractFile;

            entries = zipFile.entries();

            while (entries.hasMoreElements()) {
                ZipEntry entry = entries.nextElement();

                if (!entry.getName().startsWith(".")) {
                    if (entry.isDirectory()) {
                        // Assume directories are stored parents first then children.
                        (new File(targetDirectory, entry.getName())).mkdirs();
                        continue;
                    }

                    InputStream inStream = zipFile.getInputStream(entry);
                    BufferedOutputStream outStream = null;
                    try {
                        extractFile = new File(targetDirectory, entry.getName());
                        if (extractFile.getParentFile() != null && !extractFile.getParentFile().exists()) {
                            extractFile.getParentFile().mkdirs();
                        }

                        outStream = new BufferedOutputStream(new FileOutputStream(extractFile));
                        copyInputStream(inStream, outStream);
                    } finally {
                        inStream.close();
                        if (outStream != null) {
                            outStream.close();
                        }
                    }
                }
            }
        } finally {
            zipFile.close();
        }
    }

    /** Copy the data from one stream to another */
    public static final void copyInputStream(InputStream in, OutputStream out) throws IOException {
        byte[] buffer = new byte[4096];
        int len;

        while ((len = in.read(buffer)) >= 0) {
            out.write(buffer, 0, len);
        }

        out.close();
        in.close();
    }
}

Related

1. unzip(File destDir, InputStream is)
2. unzip(File epubfile, File destination)
3. unzip(File file, File dest)
4. unzip(File file, File destDir)
5. unzip(File file, File directory)
6. unzip(File file, File targetDirectory)
7. unzip(File file, File toDir)
8. unzip(File file, File toDirectory)
9. unzip(File file, String destination, String container)