Mega Code Archive
Some utility classes for manipulating JAR files
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/*
*
*
* Copyright 2005 Vincent Massol.
*
* 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.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.jar.JarEntry;
import java.util.jar.JarOutputStream;
/**
* Some utility classes for manipulating JAR files.
*
* @version $Id $
*/
public final class JarUtils
{
/**
* Create a jar file from a particular directory.
*
* @param root in the root directory
* @param directory in the directory we are adding
* @param jarStream the jar stream to be added to
* @throws IOException on IOException
*/
protected void createJarFromDirectory(File root,
File directory,
JarOutputStream jarStream)
throws IOException
{
byte[] buffer = new byte[40960];
int bytesRead;
File[] filesToAdd = directory.listFiles();
for (int i = 0; i < filesToAdd.length; i++)
{
File fileToAdd = filesToAdd[i];
if (fileToAdd.isDirectory())
{
createJarFromDirectory(root, fileToAdd, jarStream);
}
else
{
FileInputStream addFile = new FileInputStream(fileToAdd);
try
{
// Create a jar entry and add it to the temp jar.
String entryName = fileToAdd.getPath().substring(root.getPath().length() + 1);
// If we leave these entries as '\'s, then the resulting zip file won't be
// expandable on Unix operating systems like OSX, because it is possible to
// have filenames with \s in them - so it's impossible to determine that this
// is actually a directory.
entryName = entryName.replace('\\', '/');
JarEntry entry = new JarEntry(entryName);
jarStream.putNextEntry(entry);
// Read the file and write it to the jar.
while ((bytesRead = addFile.read(buffer)) != -1)
{
jarStream.write(buffer, 0, bytesRead);
}
jarStream.closeEntry();
}
finally
{
addFile.close();
}
}
}
}
/**
* Create a JAR file from a directory, recursing through children.
*
* @param directory in directory source
* @param outputJar in file to output the jar data to
* @return out File that was generated
* @throws IOException when there is an I/O exception
*/
public File createJarFromDirectory(String directory, File outputJar)
throws IOException
{
JarOutputStream jarStream = null;
try
{
if (!outputJar.getParentFile().exists())
{
outputJar.getParentFile().mkdirs();
}
jarStream = new JarOutputStream(new FileOutputStream(outputJar));
File dir = new File(directory);
createJarFromDirectory(dir, dir, jarStream);
}
finally
{
if (jarStream != null)
{
jarStream.close();
}
}
return outputJar;
}
}
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