从清单中获取属性值

/*

 * Lucane - a collaborative platform

 * Copyright (C) 2004 Vincent Fiack <vfiack@mail15.com>

 *

 * This library 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 library 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 library; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

//package com.nowjava;

import java.io.IOException;

import java.util.jar.Attributes;/**from N o w  J a v a  . c o m**/

import java.util.jar.JarFile;


public class Main {

    /**

     * Get an attribute value

     * 

     * @param jarUrl the jar file

     * @param attribute the attribute to fetch

     * @return the attribute value

     */

    private static String getManifestAttribute(String jarUrl,

            String attribute) throws IOException {

        JarFile jar =