Wednesday, December 12, 2007

How to zip and unzip folders with pure java

Searching for some nice code to zip and unzip folders I gathered some. Thought it would be good to clean it up a bit and put the pieces together. It is not supersafe, but it does the thing:


/**
* @param srcFolder path to the folder to be zipped
* @param destZipFile path to the final zip file
*/
static public boolean zipFolder( String srcFolder, String destZipFile ) {
if (new File(srcFolder).isDirectory()) {

ZipOutputStream zip = null;
FileOutputStream fileWriter = null;
try {
fileWriter = new FileOutputStream(destZipFile);
zip = new ZipOutputStream(fileWriter);
} catch (Exception ex) {
ex.printStackTrace();
return false;
}

addFolderToZip("", srcFolder, zip); //$NON-NLS-1$
try {
zip.flush();
zip.close();
} catch (Exception ex) {
ex.printStackTrace();
return false;
}
return true;
} else {
return false;
}
}



/**
* @param zipFile the zip file that needs to be unzipped
* @param destFolder the folder into which unzip the zip file and create the folder structure
*/
public static void unzipFolder( String zipFile, String destFolder ) {
try {
ZipFile zf = new ZipFile(zipFile);
Enumeration< ? extends ZipEntry> zipEnum = zf.entries();
String dir = destFolder;

while( zipEnum.hasMoreElements() ) {
ZipEntry item = (ZipEntry) zipEnum.nextElement();

if (item.isDirectory()) {
File newdir = new File(dir + File.separator + item.getName());
newdir.mkdir();
} else {
String newfilePath = dir + File.separator + item.getName();
File newFile = new File(newfilePath);
if (!newFile.getParentFile().exists()) {
newFile.getParentFile().mkdirs();
}

InputStream is = zf.getInputStream(item);
FileOutputStream fos = new FileOutputStream(newfilePath);
int ch;
while( (ch = is.read()) != -1 ) {
fos.write(ch);
}
is.close();
fos.close();
}
}
zf.close();
} catch (Exception e) {
e.printStackTrace();
}
}



static private void addToZip( String path, String srcFile, ZipOutputStream zip ) {
File folder = new File(srcFile);
if (folder.isDirectory()) {
addFolderToZip(path, srcFile, zip);
} else {
byte[] buf = new byte[1024];
int len;
try {
FileInputStream in = new FileInputStream(srcFile);
zip.putNextEntry(new ZipEntry(path + File.separator + folder.getName()));
while( (len = in.read(buf)) > 0 ) {
zip.write(buf, 0, len);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
}



static private void addFolderToZip( String path, String srcFolder, ZipOutputStream zip ) {
File folder = new File(srcFolder);
String listOfFiles[] = folder.list();
try {
for( int i = 0; i < listOfFiles.length; i++ ) {
addToZip(path + File.separator + folder.getName(), srcFolder + File.separator
+ listOfFiles[i], zip);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
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