获取包中的类名

/* 

 * ClassListHelper.java

 * Christoph Egger

 * $Revision$

 * 

 * Copyright (C) 2010 FTW (Telecommunications Research Center Vienna)

 * 

 *

 * This file is part of BIQINI, a free Policy and Charging Control Function

 * for session-based services.

 *

 * BIQINI is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version

 *

 * For a license to use the BIQINI software under conditions

 * other than those described here, or to purchase support for this

 * software, please contact FTW by e-mail at the following addresses:

 * fpcc@ftw.at ??

 *

 * BIQINI 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License 

 * along with this program; if not, write to the Free Software 

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

 *///from N o w J a v a . c o m - 时  代  Java

//package com.nowjava;

import java.io.File;


import java.net.URL;

import java.util.ArrayList;


public class Main {

    public static void main(String[] argv) throws Exception {

        String _PackageName = "nowjava.com";

        System.out.println(getClassNamesInPackage(_PackageName));

    }


    public static ArrayList<String> getClassNamesInPackage(

            String _PackageName) throws ClassNotFoundException {

        ArrayList<String> classes = new ArrayList<String>();

        // Get a File object for the package

        File directory = null;// from nowjava - 时代Java

        try {

            ClassLoader cld = Thread.currentThread()

                    .getContextClassLoader();

            if (cld == null) {

                throw new ClassNotFoundException("Can't get class loader.");

            }

            String path = _PackageName.replace('.', '/');

            URL resource = cld.getResource(path);

            if (resource == null) {

                throw new ClassNotFoundException("No resource for " + path);

            }

            directory = new File(resource.getFile());

        } catch (NullPointerException x) {

            throw new ClassNotFoundException(_PackageName + " ("

                    + directory + ") does not appear to be a valid package");

        }

        if (directory.exists()) {

            // Get the list of the files contained in the package

            String[] files = directory.list();

            for (int i = 0; i < files.length; i++) {