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Source code below from: Java Cookbook, Second Edition By Ian Darwin Published 14 June, 2004 Average rating       Powells     Alibris

import java.io.*;
import java.util.*;
import java.util.zip.*;

/**
 * UnZip -- print or unzip a JAR or PKZIP file using java.util.zip.
 * Command-line version: extracts files.
 * @author  Ian Darwin, Ian@DarwinSys.com
 * $Id: UnZip.java,v 1.7 2004/03/07 17:40:35 ian Exp $
 */
public class UnZip {
    /** Constants for mode listing or mode extracting. */
    public static final int LIST = 0, EXTRACT = 1;
    /** Whether we are extracting or just printing TOC */
    protected int mode = LIST;

    /** The ZipFile that is used to read an archive */
    protected ZipFile zippy;

    /** The buffer for reading/writing the ZipFile data */
    protected byte[] b;

    /** Simple main program, construct an UnZipper, process each
     * .ZIP file from argv[] through that object.
     */
    public static void main(String[] argv) {
        UnZip u = new UnZip();

        for (int i=0; i<argv.length; i++) {
            if ("-x".equals(argv[i])) {
                u.setMode(EXTRACT);
                continue;
            }
            String candidate = argv[i];
            // System.err.println("Trying path " + candidate);
            if (candidate.endsWith(".zip") ||
                candidate.endsWith(".jar"))
                    u.unZip(candidate);
            else System.err.println("Not a zip file? " + candidate);
        }
        System.err.println("All done!");
    }

    /** Construct an UnZip object. Just allocate the buffer */
    UnZip() {
        b = new byte[8092];
    }

    /** Set the Mode (list, extract). */
    protected void setMode(int m) {
        if (m == LIST ||
            m == EXTRACT)
            mode = m;
    }

    /** Cache of paths we've mkdir()ed. */
    protected SortedSet dirsMade;

    /** For a given Zip file, process each entry. */
    public void unZip(String fileName) {
        dirsMade = new TreeSet();
        try {
            zippy = new ZipFile(fileName);
            Enumeration all = zippy.entries();
            while (all.hasMoreElements()) {
                getFile((ZipEntry)all.nextElement());
            }
        } catch (IOException err) {
            System.err.println("IO Error: " + err);
            return;
        }
    }

    protected boolean warnedMkDir = false;

    /** Process one file from the zip, given its name.
     * Either print the name, or create the file on disk.
     */
    protected void getFile(ZipEntry e) throws IOException {
        String zipName = e.getName();
        switch (mode) {
        case EXTRACT:
            if (zipName.startsWith("/")) {
                if (!warnedMkDir)
                    System.out.println("Ignoring absolute paths");
                warnedMkDir = true;
                zipName = zipName.substring(1);
            }
            // if a directory, just return. We mkdir for every file,
            // since some widely-used Zip creators don't put out
            // any directory entries, or put them in the wrong place.
            if (zipName.endsWith("/")) {
                return;
            }
            // Else must be a file; open the file for output
            // Get the directory part.
            int ix = zipName.lastIndexOf('/');
            if (ix > 0) {
                String dirName = zipName.substring(0, ix);
                if (!dirsMade.contains(dirName)) {
                    File d = new File(dirName);
                    // If it already exists as a dir, don't do anything
                    if (!(d.exists() && d.isDirectory())) {
                        // Try to create the directory, warn if it fails
                        System.out.println("Creating Directory: " + dirName);
                        if (!d.mkdirs()) {
                            System.err.println(
                            "Warning: unable to mkdir " + dirName);
                        }
                        dirsMade.add(dirName);
                    }
                }
            }
            System.err.println("Creating " + zipName);
            FileOutputStream os = new FileOutputStream(zipName);
            InputStream  is = zippy.getInputStream(e);
            int n = 0;
            while ((n = is.read(b)) >0)
                os.write(b, 0, n);
            is.close();
            os.close();
            break;
        case LIST:
            // Not extracting, just list
            if (e.isDirectory()) {
                System.out.println("Directory " + zipName);
            } else {
                System.out.println("File " + zipName);
            }
            break;
        default:
            throw new IllegalStateException("mode value (" + mode + ") bad");
        }
    }
}