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Java example source code file (ArchiveUtils.java)

This example Java source code file (ArchiveUtils.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

archiveutils, buffer, bufferedinputstream, bufferedoutputstream, file, fileinputstream, fileoutputstream, gzipcompressorinputstream, gzipinputstream, ioexception, logger, string, tararchiveentry, tararchiveinputstream, zip

The ArchiveUtils.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    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.
 *
 */

package org.deeplearning4j.util;

import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.compressors.gzip.GzipCompressorInputStream;
import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.util.zip.GZIPInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

/**
 * @author Adam Gibson
 */
public class ArchiveUtils {

    private static final Logger log = LoggerFactory.getLogger(ArchiveUtils.class);

    /**
     * Extracts files to the specified destination
     * @param file the file to extract to
     * @param dest the destination directory
     * @throws IOException
     */
    public static void unzipFileTo(String file,String dest) throws IOException {
        File target = new File(file);
        if(!target.exists())
            throw new IllegalArgumentException("Archive doesnt exist");
        FileInputStream fin = new FileInputStream(target);
        int BUFFER = 2048;
        byte data[] = new byte[BUFFER];

        if(file.endsWith(".zip")) {
            //getFromOrigin the zip file content
            ZipInputStream zis =
                    new ZipInputStream(fin);
            //getFromOrigin the zipped file list entry
            ZipEntry ze = zis.getNextEntry();

            while(ze!=null){

                String fileName = ze.getName();
                File newFile = new File(dest + File.separator + fileName);

                log.info("file unzip : "+ newFile.getAbsoluteFile());

                //createComplex all non exists folders
                //else you will hit FileNotFoundException for compressed folder
                new File(newFile.getParent()).mkdirs();

                FileOutputStream fos = new FileOutputStream(newFile);

                int len;
                while ((len = zis.read(data)) > 0) {
                    fos.write(data, 0, len);
                }

                fos.close();
                ze = zis.getNextEntry();
            }

            zis.closeEntry();
            zis.close();


        }



        else if(file.endsWith(".tar.gz") || file.endsWith(".tgz")) {

            BufferedInputStream in = new BufferedInputStream(fin);
            GzipCompressorInputStream gzIn = new GzipCompressorInputStream(in);
            TarArchiveInputStream tarIn = new TarArchiveInputStream(gzIn);

            TarArchiveEntry entry = null;

            /** Read the tar entries using the getNextEntry method **/

            while ((entry = (TarArchiveEntry) tarIn.getNextEntry()) != null) {

                log.info("Extracting: " + entry.getName());

                /** If the entry is a directory, createComplex the directory. **/

                if (entry.isDirectory()) {

                    File f = new File(dest +File.separator +  entry.getName());
                    f.mkdirs();
                }
                /**
                 * If the entry is a file,write the decompressed file to the disk
                 * and close destination stream.
                 **/
                else {
                    int count;

                    FileOutputStream fos = new FileOutputStream(dest + File.separator +  entry.getName());
                    BufferedOutputStream destStream = new BufferedOutputStream(fos,
                            BUFFER);
                    while ((count = tarIn.read(data, 0, BUFFER)) != -1) {
                        destStream.write(data, 0, count);
                    }

                    destStream.flush();

                    IOUtils.closeQuietly(destStream);
                }
            }



            /** Close the input stream **/

            tarIn.close();
        }

        else if(file.endsWith(".gz")) {
            GZIPInputStream is2 = new GZIPInputStream(fin);
            File extracted = new File(target.getParent(),target.getName().replace(".gz",""));
            if(extracted.exists())
                extracted.delete();
            extracted.createNewFile();
            OutputStream fos = FileUtils.openOutputStream(extracted);
            IOUtils.copyLarge(is2,fos);
            is2.close();
            fos.flush();
            fos.close();
        }


        target.delete();

    }




}

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