Java Unzip File decompress(String filepath, File outpathdir, String includes)

Description

decompress

License

Open Source License

Declaration

public static void decompress(String filepath, File outpathdir, String includes) throws IOException 

Method Source Code

//package com.java2s;
/*/*from   w  ww .j  ava2s  .  co  m*/
 *  Copyright 2009-2010 The Inframesh Software Laboratory (ISL)
 *
 *  Licensed under the Inframesh Free Software License (the "License"), 
 *   Version 1.0 ; you may obtain a copy of the license at
 *
 *     http://www.inframesh.org/licenses/LICENSE-1.0
 *
 *  Software distributed under the License is distributed  on an "AS IS" 
 *  BASIS but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the License 
 *  for more details.
 *
 *  Inframesh, Websquare, Jex are all reserved marks.
 */

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class Main {
    public static void decompress(String filepath, String outpath) throws IOException {
        decompress(filepath, outpath, null);
    }

    public static void decompress(String filepath, File outpathdir, String includes) throws IOException {
        decompress(filepath, outpathdir.getAbsolutePath(), includes);
    }

    public static void decompress(String filepath, String outpath, String includes) throws IOException {
        if (!outpath.endsWith(File.separator)) {
            outpath += File.separator;
        }

        String regex = toRegex(includes);
        JarFile jar = new JarFile(filepath);

        Enumeration<JarEntry> entries = jar.entries();
        while (entries.hasMoreElements()) {
            JarEntry entry = entries.nextElement();
            if (entry.getName().matches(regex)) {
                String outFileName = outpath + entry.getName();
                File f = new File(outFileName);
                if (outFileName.endsWith("/") || outFileName.endsWith("\\")
                        || outFileName.endsWith(File.separator)) {
                    f.mkdir();
                } else {
                    InputStream in = jar.getInputStream(entry);
                    OutputStream out = new BufferedOutputStream(new FileOutputStream(f));

                    byte[] buffer = new byte[2048];
                    int nBytes = 0;

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

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

    /**
     * @param includes
     * @return
     */
    private static String toRegex(String includes) {
        return includes == null ? ".*" : includes.replace(".", "/").replace("*", ".*");
    }
}

Related

1. decompress(String fileName, String destinationFolder)
2. decompress(String zipFile, String targetPath)
3. decompresses(File file, File destinationDirectory)
4. decompressFile(File destFile, ZipInputStream zis)
5. decompressFile(final File toDecompress, final File destinationFile)