Java URL Connection getChildren(URL url)

Description

Takes a given url and creates a list which contains all children of the given url.

License

BSD License

Declaration

public static List<String> getChildren(URL url) 

Method Source Code

//package com.java2s;
/* Chronos - Game Development Toolkit for Java game developers. The
 * original source remains:// ww w  . ja v  a 2 s.c o  m
 * 
 * Copyright (c) 2013 Miguel Gonzalez http://my-reality.de
 * 
 * This source is provided under the terms of the BSD License.
 * 
 * Copyright (c) 2013, Chronos
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or 
 * without modification, are permitted provided that the following 
 * conditions are met:
 * 
 *  * Redistributions of source code must retain the above 
 *    copyright notice, this list of conditions and the 
 *    following disclaimer.
 *  * Redistributions in binary form must reproduce the above 
 *    copyright notice, this list of conditions and the following 
 *    disclaimer in the documentation and/or other materials provided 
 *    with the distribution.
 *  * Neither the name of the Chronos/my Reality Development nor the names of 
 *    its contributors may be used to endorse or promote products 
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, 
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS 
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, 
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR 
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 * OF SUCH DAMAGE.
 */

import java.io.File;
import java.io.IOException;

import java.net.JarURLConnection;

import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class Main {
    /**
     * Takes a given url and creates a list which contains all children of the
     * given url. (Works with Files and JARs).
     */
    public static List<String> getChildren(URL url) {
        List<String> result = new ArrayList<String>();
        if ("file".equals(url.getProtocol())) {
            File file = new File(url.getPath());
            if (!file.isDirectory()) {
                file = file.getParentFile();
            }
            addFiles(file, result, file);
        } else if ("jar".equals(url.getProtocol())) {
            try {
                JarFile jar = ((JarURLConnection) url.openConnection()).getJarFile();
                Enumeration<JarEntry> e = jar.entries();
                while (e.hasMoreElements()) {
                    JarEntry entry = e.nextElement();
                    result.add(entry.getName());
                }
            } catch (IOException e) {
                // Do nothing
            }
        }
        return result;
    }

    /**
     * Collects all children of the given file into the given result list. The
     * resulting string is the relative path from the given reference.
     */
    private static void addFiles(File file, List<String> result, File reference) {
        if (file == null || !file.exists() || !file.isDirectory()) {
            return;
        }
        for (File child : file.listFiles()) {
            if (child.isDirectory()) {
                addFiles(child, result, reference);
            } else {
                String path = null;
                while (child != null && !child.equals(reference)) {
                    if (path != null) {
                        path = child.getName() + "/" + path;
                    } else {
                        path = child.getName();
                    }
                    child = child.getParentFile();
                }
                result.add(path);
            }
        }
    }
}

Related

1. getBaseURL(URLConnection conn)
2. getBooleanFromUrl(String url)
3. getBytes(String urlStr)
4. getCharset(URLConnection connection)
5. getCharsFromURL(URL url)
6. getConnection(URL url)
7. getConnectionResponseHeaders(URLConnection c)
8. getContainerUrl(URL url, String resourceInThatDir)
9. getCookies(URLConnection conn, Map> store)