Java tutorial
/* Copyright 2004 The Apache Software Foundation * * 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 java.io.BufferedOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.jar.JarEntry; import java.util.jar.JarInputStream; import java.util.jar.JarOutputStream; /** * Provides utility services for jarring and unjarring files and directories. * Note that a given instance of JarHelper is not threadsafe with respect to * multiple jar operations. * * @author Patrick Calahan <pcal@bea.com> */ public class JarHelper { // Constants private static final int BUFFER_SIZE = 2156; // Variables private byte[] mBuffer = new byte[BUFFER_SIZE]; private int mByteCount = 0; private boolean mVerbose = false; private String mDestJarName = ""; // Constructor /** * Instantiates a new JarHelper. */ public JarHelper() { } // Public methods /** * Jars a given directory or single file into a JarOutputStream. */ public void jarDir(File dirOrFile2Jar, File destJar) throws IOException { if (dirOrFile2Jar == null || destJar == null) throw new IllegalArgumentException(); mDestJarName = destJar.getCanonicalPath(); FileOutputStream fout = new FileOutputStream(destJar); JarOutputStream jout = new JarOutputStream(fout); // jout.setLevel(0); try { jarDir(dirOrFile2Jar, jout, null); } catch (IOException ioe) { throw ioe; } finally { jout.close(); fout.close(); } } /** * Unjars a given jar file into a given directory. */ public void unjarDir(File jarFile, File destDir) throws IOException { BufferedOutputStream dest = null; FileInputStream fis = new FileInputStream(jarFile); unjar(fis, destDir); } /** * Given an InputStream on a jar file, unjars the contents into the given * directory. */ public void unjar(InputStream in, File destDir) throws IOException { BufferedOutputStream dest = null; JarInputStream jis = new JarInputStream(in); JarEntry entry; while ((entry = jis.getNextJarEntry()) != null) { if (entry.isDirectory()) { File dir = new File(destDir, entry.getName()); dir.mkdir(); if (entry.getTime() != -1) dir.setLastModified(entry.getTime()); continue; } int count; byte data[] = new byte[BUFFER_SIZE]; File destFile = new File(destDir, entry.getName()); if (mVerbose) System.out.println("unjarring " + destFile + " from " + entry.getName()); FileOutputStream fos = new FileOutputStream(destFile); dest = new BufferedOutputStream(fos, BUFFER_SIZE); while ((count = jis.read(data, 0, BUFFER_SIZE)) != -1) { dest.write(data, 0, count); } dest.flush(); dest.close(); if (entry.getTime() != -1) destFile.setLastModified(entry.getTime()); } jis.close(); } public void setVerbose(boolean b) { mVerbose = b; } // Private methods private static final char SEP = '/'; /** * Recursively jars up the given path under the given directory. */ private void jarDir(File dirOrFile2jar, JarOutputStream jos, String path) throws IOException { if (mVerbose) System.out.println("checking " + dirOrFile2jar); if (dirOrFile2jar.isDirectory()) { String[] dirList = dirOrFile2jar.list(); String subPath = (path == null) ? "" : (path + dirOrFile2jar.getName() + SEP); if (path != null) { JarEntry je = new JarEntry(subPath); je.setTime(dirOrFile2jar.lastModified()); jos.putNextEntry(je); jos.flush(); jos.closeEntry(); } for (int i = 0; i < dirList.length; i++) { File f = new File(dirOrFile2jar, dirList[i]); jarDir(f, jos, subPath); } } else { if (dirOrFile2jar.getCanonicalPath().equals(mDestJarName)) { if (mVerbose) System.out.println("skipping " + dirOrFile2jar.getPath()); return; } if (mVerbose) System.out.println("adding " + dirOrFile2jar.getPath()); FileInputStream fis = new FileInputStream(dirOrFile2jar); try { JarEntry entry = new JarEntry(path + dirOrFile2jar.getName()); entry.setTime(dirOrFile2jar.lastModified()); jos.putNextEntry(entry); while ((mByteCount = fis.read(mBuffer)) != -1) { jos.write(mBuffer, 0, mByteCount); if (mVerbose) System.out.println("wrote " + mByteCount + " bytes"); } jos.flush(); jos.closeEntry(); } catch (IOException ioe) { throw ioe; } finally { fis.close(); } } } // for debugging public static void main(String[] args) throws IOException { if (args.length < 2) { System.err.println("Usage: JarHelper jarname.jar directory"); return; } JarHelper jarHelper = new JarHelper(); jarHelper.mVerbose = true; File destJar = new File(args[0]); File dirOrFile2Jar = new File(args[1]); jarHelper.jarDir(dirOrFile2Jar, destJar); } }