Mega Code Archive
Jarring and unjarring files and directories
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/* 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);
}
}
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