Java Path File Name nio unzipFile(String fileName, String targetPath)

Description

Unzips a zip.

License

Apache License

Parameter

Parameter	Description
fileName	a parameter
targetDirName	a parameter

Exception

Parameter	Description
IOException	an exception

Declaration

public static void unzipFile(String fileName, String targetPath) throws IOException 

Method Source Code

//package com.java2s;
/**/* w w w .  ja va 2  s .  c o  m*/
 * Copyright 2011-2013 BBe Consulting GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;
import java.io.InputStream;

import java.util.Enumeration;

import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import java.nio.channels.Channels;
import java.nio.channels.FileChannel;

public class Main {
    /**
     * Unzips a zip.
     * 
     * @param fileName
     * @param targetDirName
     * @throws IOException
     */
    public static void unzipFile(String fileName, String targetPath) throws IOException {

        final File targetDir = new File(targetPath);
        final ZipFile sourceZip = new ZipFile(fileName);

        @SuppressWarnings("unchecked")
        final Enumeration<ZipEntry> entries = (Enumeration<ZipEntry>) sourceZip.entries();

        while (entries.hasMoreElements()) {
            ZipEntry currentEntry = entries.nextElement();
            File targetFile = new File(targetDir, currentEntry.getName());
            // create sub directories if needed
            targetFile.getParentFile().mkdirs();
            // write file if it's not a directory
            if (!currentEntry.isDirectory()) {
                writeFileFromZip(targetFile, currentEntry, sourceZip);
            }
        }
    }

    private static void writeFileFromZip(File targetFile, ZipEntry zipEntry, ZipFile archive) throws IOException {

        FileChannel output = null;
        FileOutputStream rawOut = null;
        try {
            final InputStream rawIn = archive.getInputStream(zipEntry);
            rawOut = new FileOutputStream(targetFile);
            output = rawOut.getChannel();
            output.transferFrom(Channels.newChannel(rawIn), 0, zipEntry.getSize());
        } finally {
            if (output != null) {
                output.close();
            }
            if (rawOut != null) {
                rawOut.close();
            }
        }
    }
}

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