解开

/*

    Copyright (c) 2010 Gary S. Weaver


    Permission is hereby granted, free of charge, to any person obtaining a copy

    of this software and associated documentation files (the "Software"), to deal

    in the Software without restriction, including without limitation the rights

    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

    copies of the Software, and to permit persons to whom the Software is

    furnished to do so, subject to the following conditions:


    The above copyright notice and this permission notice shall be included in

    all copies or substantial portions of the Software.


    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

    THE SOFTWARE.

 */
 /**
  * n o w j a v a . c o m - 时  代  Java 提 供 
 **/

import java.io.*;

import java.util.*;

import java.util.jar.*;


public class Main{

    public static Manifest unjar(File archive, File outputDir)

            throws IOException {


        JarFile jarfile = new JarFile(archive);

        Manifest manifest = jarfile.getManifest();

        for (Enumeration e = jarfile.entries(); e.hasMoreElements();) {

            JarEntry entry = (JarEntry) e.nextElement();

            unjarEntry(jarfile, entry, outputDir);

        }

        return manifest;/* from 时 代      J a v a   公   众 号 - nowjava.com*/

    }

    private static void unjarEntry(JarFile jarfile, JarEntry entry,

            File outputDir) throws IOException {


        if (entry.isDirectory()) {

            File dir = new File(outputDir, entry.getName());

            System.err.println("Extracting directory: '"

                    + dir.getCanonicalPath() + "'");

            createDirectoryAndParentDirectories(dir);

            return;

        }


        File outputFile = new File(outputDir, entry.getName());

        System.err.println("Extracting file: '"

                + outputFile.getCanonicalPath() + "'");

        if (!outputFile.getParentFile().exists()) {

            createDirectoryAndParentDirectories(outputFile.getParentFile());

        }


        BufferedInputStream in = new BufferedInputStream(

                jarfile.getInputStream(entry));

        BufferedOutputStream out = new BufferedOutputStream(

                new FileOutputStream(outputFile));


        try {

            IOUtil.copy(in, out);

        } finally {

            try {

                out.close();

            } catch (Throwable t) {

                t.printStackTrace();

            }