Java tutorial
/* * ### * Android Maven Plugin - android-maven-plugin * * Copyright (C) 1999 - 2012 Photon Infotech Inc. * * 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. * ### */ /* * Copyright (C) 2009 Jayway AB * * 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. */ package com.photon.maven.plugins.android.common; import org.apache.commons.io.IOUtils; import org.codehaus.plexus.util.IOUtil; import java.io.*; import java.util.Enumeration; import java.util.jar.JarEntry; import java.util.jar.JarFile; /** Helper class to deal with jar files. */ public class JarHelper { public interface UnjarListener { boolean include(JarEntry jarEntry); } /** Unjars the specified jar file into the the specified directory * * @param jarFile * @param outputDirectory * @param unjarListener * @throws IOException */ public static void unjar(JarFile jarFile, File outputDirectory, UnjarListener unjarListener) throws IOException { for (Enumeration en = jarFile.entries(); en.hasMoreElements();) { JarEntry entry = (JarEntry) en.nextElement(); File entryFile = new File(outputDirectory, entry.getName()); if (unjarListener.include(entry)) { if (!entryFile.getParentFile().exists() && !entryFile.getParentFile().mkdirs()) { throw new IOException("Error creating output directory: " + entryFile.getParentFile()); } // If the entry is an actual file, unzip that too if (!entry.isDirectory()) { final InputStream in = jarFile.getInputStream(entry); try { final OutputStream out = new FileOutputStream(entryFile); try { IOUtil.copy(in, out); } finally { IOUtils.closeQuietly(out); } } finally { IOUtils.closeQuietly(in); } } } } } }