Add jar contents to the deployment archive under the given prefix : JarFile « File « Java Tutorial

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 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.jar.JarEntry;
import java.util.jar.JarInputStream;
import java.util.jar.JarOutputStream;

/**
 * A collection of jar utilities
 * 
 * @author thomas.diesler@jboss.org
 * @version $Revision: 81011 $
 */
public class JarUtils {
  /**
   * Add jar contents to the deployment archive under the given prefix
   */
  public static String[] addJar(JarOutputStream outputStream, String prefix, File jar)
      throws IOException {

    ArrayList tmp = new ArrayList();
    FileInputStream fis = new FileInputStream(jar);
    JarInputStream jis = new JarInputStream(fis);
    JarEntry entry = jis.getNextJarEntry();
    while (entry != null) {
      if (entry.isDirectory() == false) {
        String entryName = prefix + entry.getName();
        tmp.add(entryName);
        addJarEntry(outputStream, entryName, jis);
      }
      entry = jis.getNextJarEntry();
    }
    jis.close();
    String[] names = new String[tmp.size()];
    tmp.toArray(names);
    return names;
  }

  /**
   * Add a jar entry to the deployment archive
   */
  public static void addJarEntry(JarOutputStream outputStream, String entryName,
      InputStream inputStream) throws IOException {
    outputStream.putNextEntry(new JarEntry(entryName));
    copyStream(outputStream, inputStream);
  }

  /**
   * Copies the input stream to the output stream
   */
  public static void copyStream(OutputStream outputStream, InputStream inputStream)
      throws IOException {
    byte[] bytes = new byte[4096];
    int read = inputStream.read(bytes, 0, 4096);
    while (read > 0) {
      outputStream.write(bytes, 0, read);
      read = inputStream.read(bytes, 0, 4096);
    }
  }

}