在清单中具有主要属性值

/*

 * JBoss, Home of Professional Open Source.

 * Copyright 2012, Red Hat, Inc., and individual contributors

 * 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.

 */
 /*
 时代Java公众号 - N o w J a  v a . c o m 提供
 */

//package com.nowjava;

import java.util.jar.Attributes;

import java.util.jar.Manifest;


public class Main {

    public static boolean hasMainAttributeValue(Manifest manifest,

            String attribute) {

        return getMainAttributeValue(manifest, attribute) != null;

    }


    public static String getMainAttributeValue(Manifest manifest,/* 来自 时   代     Java  公  众  号 - nowjava.com*/

            String a