Adverts
It is often useful to be able to zip and unzip files programatically. Provided below is a utility that will zip and unzip a directory. This example is a good starting point for a more general zipping / unzipping utility class. At the moment it is fairly basic and only carries out the task that I most commonly perform - zipping a directory. It can't currently zip an individual file and there is no way to set the zip compression level.
package example;
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.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
public class ZipUtility {
public static final void zipDirectory( File directory, File zip ) throws IOException {
ZipOutputStream zos = new ZipOutputStream( new FileOutputStream( zip ) );
zip( directory, directory, zos );
zos.close();
}
private static final void zip(File directory, File base,
ZipOutputStream zos) throws IOException {
File[] files = directory.listFiles();
byte[] buffer = new byte[8192];
int read = 0;
for (int i = 0, n = files.length; i < n; i++) {
if (files[i].isDirectory()) {
zip(files[i], base, zos);
} else {
FileInputStream in = new FileInputStream(files[i]);
ZipEntry entry = new ZipEntry(files[i].getPath().substring(
base.getPath().length() + 1));
zos.putNextEntry(entry);
while (-1 != (read = in.read(buffer))) {
zos.write(buffer, 0, read);
}
in.close();
}
}
}
public static final void unzip(File zip, File extractTo) throws IOException {
ZipFile archive = new ZipFile(zip);
Enumeration e = archive.entries();
while (e.hasMoreElements()) {
ZipEntry entry = (ZipEntry) e.nextElement();
File file = new File(extractTo, entry.getName());
if (entry.isDirectory() && !file.exists()) {
file.mkdirs();
} else {
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
InputStream in = archive.getInputStream(entry);
BufferedOutputStream out = new BufferedOutputStream(
new FileOutputStream(file));
byte[] buffer = new byte[8192];
int read;
while (-1 != (read = in.read(buffer))) {
out.write(buffer, 0, read);
}
in.close();
out.close();
}
}
}
}
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.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import java.util.zip.ZipOutputStream;
public class ZipUtility {
public static final void zipDirectory( File directory, File zip ) throws IOException {
ZipOutputStream zos = new ZipOutputStream( new FileOutputStream( zip ) );
zip( directory, directory, zos );
zos.close();
}
private static final void zip(File directory, File base,
ZipOutputStream zos) throws IOException {
File[] files = directory.listFiles();
byte[] buffer = new byte[8192];
int read = 0;
for (int i = 0, n = files.length; i < n; i++) {
if (files[i].isDirectory()) {
zip(files[i], base, zos);
} else {
FileInputStream in = new FileInputStream(files[i]);
ZipEntry entry = new ZipEntry(files[i].getPath().substring(
base.getPath().length() + 1));
zos.putNextEntry(entry);
while (-1 != (read = in.read(buffer))) {
zos.write(buffer, 0, read);
}
in.close();
}
}
}
public static final void unzip(File zip, File extractTo) throws IOException {
ZipFile archive = new ZipFile(zip);
Enumeration e = archive.entries();
while (e.hasMoreElements()) {
ZipEntry entry = (ZipEntry) e.nextElement();
File file = new File(extractTo, entry.getName());
if (entry.isDirectory() && !file.exists()) {
file.mkdirs();
} else {
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
InputStream in = archive.getInputStream(entry);
BufferedOutputStream out = new BufferedOutputStream(
new FileOutputStream(file));
byte[] buffer = new byte[8192];
int read;
while (-1 != (read = in.read(buffer))) {
out.write(buffer, 0, read);
}
in.close();
out.close();
}
}
}
}