Unzip a file to a specified directory - Java File Path IO

Java examples for File Path IO:Zip File

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Description

Unzip a file to a specified directory

Demo Code

/**//  w  ww  .jav a2  s  . 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.
 */
//package com.java2s;
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();
    }
}

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