Writes all files of the given directory to the specified jar-file. - Java Reflection

Java examples for Reflection:Jar

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Description

Writes all files of the given directory to the specified jar-file.

Demo Code

/*//  w  w w . j  a  v  a2  s.co m
 * Created on 24-Feb-2004 at 16:35:32.
 *
 * Copyright (c) 2004-2005 Robert Virkus / Enough Software
 *
 * This file is part of J2ME Polish.
 *
 * J2ME Polish is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * J2ME Polish 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 J2ME Polish; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Commercial licenses are also available, please
 * refer to the accompanying LICENSE.txt or visit
 * http://www.j2mepolish.org for details.
 */
//package com.java2s;
import java.io.*;

import java.util.jar.*;
import java.util.zip.CRC32;

import java.util.zip.ZipOutputStream;

public class Main {
    /**
     * Writes all files of the given directory to the specified jar-file.
     * 
     * @param sourceDir The directory containing the "source" files.
     * @param target The jar file which should be created
     * @param compress True when the jar file should be compressed
     * @throws FileNotFoundException when a file could not be found
     * @throws IOException when a file could not be read or the jar file could not be written to.
     */
    public static void jar(File sourceDir, File target, boolean compress)
            throws FileNotFoundException, IOException {
        // create target directory if necessary: 
        if (!target.getParentFile().exists()) {
            target.getParentFile().mkdirs();
        }
        // creates target-jar-file:
        JarOutputStream out = new JarOutputStream(new FileOutputStream(
                target));
        if (compress) {
            out.setLevel(ZipOutputStream.DEFLATED);
        } else {
            out.setLevel(ZipOutputStream.STORED);
        }
        // create a CRC32 object:
        CRC32 crc = new CRC32();
        byte[] buffer = new byte[1024 * 1024];
        // read all files from the source directory:
        File[] fileNames = sourceDir.listFiles();
        int sourceDirLength = sourceDir.getAbsolutePath().length() + 1;
        for (int i = 0; i < fileNames.length; i++) {
            File file = fileNames[i];
            addFile(file, out, crc, sourceDirLength, buffer);
        }
        out.close();
    }

    /**
     * Adds one file to the given jar file.
     * If the specified file is a directory, all included files will be added.
     * 
     * @param file The file which should be added
     * @param out The jar file to which the given jar file should be added
     * @param crc A helper class for the CRC32 calculation
     * @param sourceDirLength The number of chars which can be skipped from the file's path
     * @param buffer A buffer for reading the files.
     * @throws FileNotFoundException when the file was not found
     * @throws IOException when the file could not be read or not be added
     */
    private static void addFile(File file, JarOutputStream out, CRC32 crc,
            int sourceDirLength, byte[] buffer)
            throws FileNotFoundException, IOException {
        if (file.isDirectory()) {
            File[] fileNames = file.listFiles();
            for (int i = 0; i < fileNames.length; i++) {
                addFile(fileNames[i], out, crc, sourceDirLength, buffer);
            }
        } else {
            String entryName = file.getAbsolutePath().substring(
                    sourceDirLength);
            JarEntry entry = new JarEntry(entryName);
            out.putNextEntry(entry);
            // read file:
            FileInputStream in = new FileInputStream(file);
            int read;
            long size = 0;
            while ((read = in.read(buffer)) != -1) {
                crc.update(buffer, 0, read);
                out.write(buffer, 0, read);
                size += read;
            }
            entry.setCrc(crc.getValue());
            entry.setSize(size);
            in.close();
            out.closeEntry();
            crc.reset();
        }
    }
}

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