Mega Code Archive
Reads GZIP, Zip, and Jar files
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/*
* Copyright (C) 2005 Caio Filipini, Sergio Umlauf
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Created on 14/09/2005
*
*/
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.jar.Attributes;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.zip.GZIPInputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
/**
* Reads GZIP, Zip, and Jar files
*
* @author Sergio Umlauf
*
*/
public class Zip {
/**
* Reads a GZIP file and dumps the contents to the console.
*/
public static void readGZIPFile(String fileName) {
// use BufferedReader to get one line at a time
BufferedReader gzipReader = null;
try {
// simple loop to dump the contents to the console
gzipReader = new BufferedReader(
new InputStreamReader(
new GZIPInputStream(
new FileInputStream(fileName))));
while (gzipReader.ready()) {
System.out.println(gzipReader.readLine());
}
gzipReader.close();
} catch (FileNotFoundException fnfe) {
System.out.println("The file was not found: " + fnfe.getMessage());
} catch (IOException ioe) {
System.out.println("An IOException occurred: " + ioe.getMessage());
} finally {
if (gzipReader != null) {
try { gzipReader.close(); } catch (IOException ioe) {}
}
}
}
/**
* Reads a Zip file, iterating through each entry and dumping the contents
* to the console.
*/
public static void readZipFile(String fileName) {
ZipFile zipFile = null;
try {
// ZipFile offers an Enumeration of all the files in the Zip file
zipFile = new ZipFile(fileName);
for (Enumeration e = zipFile.entries(); e.hasMoreElements();) {
ZipEntry zipEntry = (ZipEntry) e.nextElement();
System.out.println(zipEntry.getName() + " contains:");
// use BufferedReader to get one line at a time
BufferedReader zipReader = new BufferedReader(
new InputStreamReader(zipFile.getInputStream(zipEntry)));
while (zipReader.ready()) {
System.out.println(zipReader.readLine());
}
zipReader.close();
}
} catch (IOException ioe) {
System.out.println("An IOException occurred: " + ioe.getMessage());
} finally {
if (zipFile != null) {
try { zipFile.close(); } catch (IOException ioe) {}
}
}
}
/**
* Reads a Jar file, displaying the attributes in its manifest and dumping
* the contents of each file contained to the console.
*/
public static void readJarFile(String fileName) {
JarFile jarFile = null;
try {
// JarFile extends ZipFile and adds manifest information
jarFile = new JarFile(fileName);
if (jarFile.getManifest() != null) {
System.out.println("Manifest Main Attributes:");
Iterator iter =
jarFile.getManifest().getMainAttributes().keySet().iterator();
while (iter.hasNext()) {
Attributes.Name attribute = (Attributes.Name) iter.next();
System.out.println(attribute + " : " +
jarFile.getManifest().getMainAttributes().getValue(attribute));
}
System.out.println();
}
// use the Enumeration to dump the contents of each file to the console
System.out.println("Jar file entries:");
for (Enumeration e = jarFile.entries(); e.hasMoreElements();) {
JarEntry jarEntry = (JarEntry) e.nextElement();
if (!jarEntry.isDirectory()) {
System.out.println(jarEntry.getName() + " contains:");
BufferedReader jarReader = new BufferedReader(
new InputStreamReader(jarFile.getInputStream(jarEntry)));
while (jarReader.ready()) {
System.out.println(jarReader.readLine());
}
jarReader.close();
}
}
} catch (IOException ioe) {
System.out.println("An IOException occurred: " + ioe.getMessage());
} finally {
if (jarFile != null) {
try { jarFile.close(); } catch (IOException ioe) {}
}
}
}
}
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