Java Folder Read getFiles(File apkFile, Pattern regex)

Description

Returns all files in an apk that match a given regular expression.

License

Open Source License

Parameter

Parameter	Description
apkFile	The file containing the apk zip archive.
regex	A regular expression to match the requested filenames.

Exception

Parameter	Description
IOException	Thrown if a matching file cannot be read from the apk.

Return

A mapping of the matched filenames to their byte contents.

Declaration

public static Map<String, byte[]> getFiles(File apkFile, Pattern regex) throws IOException 

Method Source Code

//package com.java2s;
/*//from www. j av a  2s  .co m
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import com.google.common.io.ByteStreams;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

public class Main {
    /**
     * Returns all files in an apk that match a given regular expression.
     *
     * @param apkFile The file containing the apk zip archive.
     * @param regex A regular expression to match the requested filenames.
     * @return A mapping of the matched filenames to their byte contents.
     * @throws IOException Thrown if a matching file cannot be read from the apk.
     */
    public static Map<String, byte[]> getFiles(File apkFile, String regex) throws IOException {
        return getFiles(apkFile, Pattern.compile(regex));
    }

    /**
     * Returns all files in an apk that match a given regular expression.
     *
     * @param apkFile The file containing the apk zip archive.
     * @param regex A regular expression to match the requested filenames.
     * @return A mapping of the matched filenames to their byte contents.
     * @throws IOException Thrown if a matching file cannot be read from the apk.
     */
    public static Map<String, byte[]> getFiles(File apkFile, Pattern regex) throws IOException {
        Map<String, byte[]> files = new LinkedHashMap<>(); // Retain insertion order
        // Extract apk
        try (ZipFile apkZip = new ZipFile(apkFile)) {
            Enumeration<? extends ZipEntry> zipEntries = apkZip.entries();
            while (zipEntries.hasMoreElements()) {
                ZipEntry zipEntry = zipEntries.nextElement();
                // Visit all files with the given extension
                if (regex.matcher(zipEntry.getName()).matches()) {
                    // Map class name to definition
                    try (InputStream is = new BufferedInputStream(apkZip.getInputStream(zipEntry))) {
                        files.put(zipEntry.getName(), ByteStreams.toByteArray(is));
                    }
                }
            }
        }
        return files;
    }
}

Related

1. getFiles(Collection folders)
2. getFiles(File archive)
3. getFiles(File dir)
4. getFiles(File dir)
5. getFiles(File dir)