Say I have a zip file MyZipFile.zip which contains (1) a file MyFile.txt and (2) a folder MyFolder which contains a file MyFileInMyFolder.txt, i.e. something as follows:
MyZipFile.zip
|-> MyFile.txt
|-> MyFolder
|-> MyFileInMyFolder.txt
I want to decompress this zip archive. The most common code sample I have been able to find searching online uses the ZipInputStream class somewhat like the code pasted at the bottom of this question. The problem with this however, using the example above, is that it will create MyFolder but will not decompress the contents of MyFolder. Anyone know whether it is possible to decompress the contents of a folder in a zip archive using ZipInputStream or by any other means?
public static boolean unzip(File sourceZipFile, File targetFolder)
{
// pre-stuff
ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(sourceZipFile));
ZipEntry zipEntry = null;
while ((zipEntry = zipInputStream.getNextEntry()) != null)
{
File zipEntryFile = new File(targetFolder, zipEntry.getName());
if (zipEntry.isDirectory())
{
if (!zipEntryFile.exists() && !zipEntryFile.mkdirs())
return false;
}
else
{
FileOutputStream fileOutputStream = new FileOutputStream(zipEntryFile);
byte buffer[] = new byte[1024];
int count;
while ((count = zipInputStream.read(buffer, 0, buffer.length)) != -1)
fileOutputStream.write(buffer, 0, count);
fileOutputStream.flush();
fileOutputStream.close();
zipInputStream.closeEntry();
}
}
zipInputStream.close();
// post-stuff
}
Try this:
ZipInputStream zis = null;
try {
zis = new ZipInputStream(new FileInputStream(zipFilePath));
ZipEntry entry;
while ((entry = zis.getNextEntry()) != null) {
// Create a file on HDD in the destinationPath directory
// destinationPath is a "root" folder, where you want to extract your ZIP file
File entryFile = new File(destinationPath, entry.getName());
if (entry.isDirectory()) {
if (entryFile.exists()) {
logger.log(Level.WARNING, "Directory {0} already exists!", entryFile);
} else {
entryFile.mkdirs();
}
} else {
// Make sure all folders exists (they should, but the safer, the better ;-))
if (entryFile.getParentFile() != null && !entryFile.getParentFile().exists()) {
entryFile.getParentFile().mkdirs();
}
// Create file on disk...
if (!entryFile.exists()) {
entryFile.createNewFile();
}
// and rewrite data from stream
OutputStream os = null;
try {
os = new FileOutputStream(entryFile);
IOUtils.copy(zis, os);
} finally {
IOUtils.closeQuietly(os);
}
}
}
} finally {
IOUtils.closeQuietly(zis);
}
Note, that it uses Apache Commons IO to handle stream copying / closing.
Related
Unzipping multipart file with and without subdirectories since I am not giving any instruction to user to how to zip the file therefore I need to find/search all files from Zip file which might have directories and subdirectories and keeping all files in a seperate different folder.
So basically it is some kind of smart unzipping where it detects the directory using ZipEntry then skip and find file to write in the folder.
I have written a code but I am not even near it since I am getting only one file that too which has no directories in it.
String outputPath="C:\\Users\\Plootus\\exceldocs\\";
FileSystem fileSystem = FileSystems.getDefault();
try
{
ZipInputStream zis=new ZipInputStream(serverFile.getInputStream());
BufferedInputStream bis=null;
InputStream is=null;
//Get file entries
ZipEntry entry=null;
//We will unzip files in this folder
while ( (entry = zis.getNextEntry()) != null ) {
System.out.println(entry.getName());
if(!entry.isDirectory()) {
System.out.println(entry.getName());
is = zis;
bis = new BufferedInputStream(is);
String uncompressedFileName = outputPath+toolName+entry.getName();
Path uncompressedFilePath = fileSystem.getPath(uncompressedFileName);
Files.createFile(uncompressedFilePath);
FileOutputStream fileOutput = new FileOutputStream(uncompressedFileName);
while (bis.available() > 0)
{
fileOutput.write(bis.read());
}
fileOutput.close();
System.out.println("Written :" + entry.getName());
bis.close();
is.close();
}
}
zis.close();
return true;
}
catch(IOException e)
{
return false;
}
return false;
Objective: Zip file contains possible entries
1.) abc.zip(Multipart File)
-folder1-arkan.csv,dan.csv,kud.csv
abc.zip(Mutlipart File)
-folder1--bio.csv(file)-folder-2(inside folder1)-arkan.csv,dan.csv,kud.csv
abc.zip(Mutlipart File)
-arkan.csv,dan.csv,kud.csv
Instead of extracting from MultipartFile and handling entries as ZipEntry(as told by #Jokkeri) is not possible therefore I found other way to do it.
I will save that file and when the operation is done then delete it.
After receiving multipart file I saved the file using File object(saveZip)
try(ZipFile file = new ZipFile(saveZip.getCanonicalPath()))
{
FileSystem fileSystem = FileSystems.getDefault();
//Get file entries
Path inputpath=fileSystem.getPath(file.getName());
Enumeration<? extends ZipEntry> entries = file.entries();
//We will unzip files in this folder
File directory=new File(zipFilePath.concat(username+"-"+toolName));
if(!directory.exists()) {
directory.mkdir();
}
//Iterate over entries
while (entries.hasMoreElements())
{
ZipEntry entry = entries.nextElement();
String abc[]=entry.getName().split("/");
//Else create the file
if(!entry.isDirectory())
{
InputStream is = file.getInputStream(entry);
BufferedInputStream bis = new BufferedInputStream(is);
String uncompressedFileName = zipFilePath +username+"-"+toolName+"/"+ abc[abc.length-1];
Path uncompressedFilePath = fileSystem.getPath(uncompressedFileName);
if(Files.notExists(uncompressedFilePath))
Files.createFile(uncompressedFilePath);
FileOutputStream fileOutput = new FileOutputStream(uncompressedFileName);
while (bis.available() > 0)
{
fileOutput.write(bis.read());
}
fileOutput.close();
System.out.println("Written :" + entry.getName());
is.close();
bis.close();
}
}
file.close();
Files.deleteIfExists(inputpath);
return true;
}catch(IOException e)
{
e.printStackTrace();
return false;
}
I have a zip file in assets. On first run of app, zip file (all files and folders) gets unzipped and stored in internal storage area. The base unzipped path is getFilesDir(). Since zip also contains folders, i could not use openFileOutput as it gave an error, contains a path separator. So i have used FileOutputStream instead which is now working fine. Since FileOutputStream does not expect private flag. Are these unzipped files and folders are private to my app or can they be accessed from other apps?
Here's the code,
`public boolean unpackZip(InputStream is, String path) throws IOException {
String filename;
ZipInputStream zis = new ZipInputStream(new BufferedInputStream(is));
ZipEntry ze;
byte[] buffer = new byte[1024];
int count;
while ((ze = zis.getNextEntry()) != null) {
filename = ze.getName();
// Need to create directories if not exists, or
// it will generate an Exception...
if (ze.isDirectory()) {
File fmd = new File(path + filename);
fmd.mkdirs();
continue;
}
FileOutputStream fout = new FileOutputStream(path + filename);
while ((count = zis.read(buffer)) != -1) {
fout.write(buffer, 0, count);
}
fout.close();
zis.closeEntry();
}
zis.close();
return true;
}`
Is there a direct way to unpack a java.util.zip.ZipEntry to a File?
I want to specify a location (like "C:\temp\myfile.java") and unpack the Entry to that location.
There is some code with streams on the net, but I would prefer a tested library function.
Use ZipFile class
ZipFile zf = new ZipFile("zipfile");
Get entry
ZipEntry e = zf.getEntry("name");
Get inpustream
InputStream is = zf.getInputStream(e);
Save bytes
Files.copy(is, Paths.get("C:\\temp\\myfile.java"));
Use the below code to extract the "zip file" into File's then added in the list using ZipEntry. Hopefully, this will help you.
private List<File> unzip(Resource resource) {
List<File> files = new ArrayList<>();
try {
ZipInputStream zin = new ZipInputStream(resource.getInputStream());
ZipEntry entry = null;
while((entry = zin.getNextEntry()) != null) {
File file = new File(entry.getName());
FileOutputStream os = new FileOutputStream(file);
for (int c = zin.read(); c != -1; c = zin.read()) {
os.write(c);
}
os.close();
files.add(file);
}
} catch (IOException e) {
log.error("Error while extract the zip: "+e);
}
return files;
}
Use ZipInputStream to move to the desired ZipEntry by iterating using the getNextEntry() method. Then use the ZipInputStream.read(...) method to read the bytes for the current ZipEntry. Output those bytes to a FileOutputStream pointing to a file of your choice.
i'm using the following code from the web
File dir = new File(dest.getAbsolutePath(), archiveName);
// create output directory if it doesn't exist
if (!dir.exists()) {
dir.mkdirs();
}
System.err.println(pArchivePath);
ZipFile zipFile = null;
try {
zipFile = new ZipFile(pArchivePath);
Enumeration<?> enu = zipFile.entries();
while (enu.hasMoreElements()) {
ZipEntry zipEntry = (ZipEntry) enu.nextElement();
String name = zipEntry.getName();
long size = zipEntry.getSize();
long compressedSize = zipEntry.getCompressedSize();
System.out.printf("name: %-20s | size: %6d | compressed size: %6d\n",
name, size, compressedSize);
File file = new File(name);
if (name.endsWith("/")) {
System.err.println("make dir " + name);
file.mkdirs();
continue;
}
File parent = file.getParentFile();
if (parent != null) {
parent.mkdirs();
}
InputStream is = zipFile.getInputStream(zipEntry);
FileOutputStream fos = new FileOutputStream(file);
byte[] bytes = new byte[1024];
int length;
while ((length = is.read(bytes)) >= 0) {
fos.write(bytes, 0, length);
}
is.close();
fos.close();
}
zipFile.close();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (zipFile != null) {
try {
zipFile.close();
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
to unzip an archive. It's packed with 7zip or Winrar as an .zip archive but renamed to .qtz (but i don't thing this causes the problem..)
So if i run the code to unzip my archive everything works fine: i get the output on sysout/err listing all files and also no exception occurs, but if i look in the destination directory ... it's empty - just the root folder exists.
I also used
Runtime.getRuntime().exec(String.format("unzip %s -d %s", pArchivePath, dest.getPath()));
but I can't use this anymore 'cause a new process is started and I'm continuing working on the archive right after the unzip process in the java code.
Well the question is.. why doesn't this peace of code work? There a lot of similar examples but none of them worked for me.
br, Philipp
EDIT: The following solved my Problem
File file = new File(dir.getParent(), name);
So i didn't set the right parent path for this file.
The below fragment in your code:
File parent = file.getParentFile();
if (parent != null) {
parent.mkdirs();
}
where does this create the parent directories? Because I tried your code and it's not creating in the destination directory but rather in my Eclipse's project directory. Looking at your code, the destination directory is nowhere used, right?
The code actually extracts the contents of the zip file but not where I expected it.
I am thinking because I don't see you doing something like this:
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipPath+ "Zip.zip"));
out.putNextEntry(new ZipEntry("Results.csv"));
I am still working on it but I think that the problem because that makes the file inside of the zip
Also you should probably use the ZipOutputStream to write; like
out.write(bytes, 0, length);
I have this little piece of code
public void doBuild() throws IOException {
ZipEntry sourceEntry=new ZipEntry(sourcePath);
ZipEntry assetEntry=new ZipEntry(assetPath);
ZipOutputStream out = new ZipOutputStream(new FileOutputStream("output/"+workOn.getName().replaceAll(".bld"," ")+buildNR+".zip"));
out.putNextEntry(sourceEntry);
out.putNextEntry(assetEntry);
out.close();
System.err.println("Build success!");
increaseBuild();
}
So, if I run it it runs trough it fine, creates the .zip and all, but the zip file is empty. sourceEntry and assetEntry are both directories. How could I get those directories to my .zip easily?
For those interested this is a MC mod build system and can be found at https://bitbucket.org/makerimages/makerbuild-system NOTE: the code above is not commited or pushed to there yet!!!!!!!!
Try something like this. The parameter useFullFileNames specifies
whether you want to preserve the full names of the paths to the
files which you're about to zip.
So if you have two files
/dir1/dir2/a.txt
and
/dir1/b.txt
the useFullFileNames specifies if you want to finally see in
the zip file those original paths to the two files or just
the two files with no paths like this
a.txt
and
b.txt
in the root of the zip file which you create.
Note that in my example, the files which are zipped
are actually read and then written to out.
I think you're missing that part.
public static boolean createZip(String fNameZip, boolean useFullFileNames, String... fNames) throws Exception {
try {
int cntBufferSize = 256 * 1024;
BufferedInputStream origin = null;
FileOutputStream dest = new FileOutputStream(fNameZip);
ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(dest));
byte bBuffer[] = new byte[cntBufferSize];
File ftmp = null;
for (int i = 0; i < fNames.length; i++) {
if (fNames[i] != null) {
FileInputStream fi = new FileInputStream(fNames[i]);
origin = new BufferedInputStream(fi, cntBufferSize);
ftmp = new File(fNames[i]);
ZipEntry entry = new ZipEntry(useFullFileNames ? fNames[i] : ftmp.getName());
out.putNextEntry(entry);
int count;
while ((count = origin.read(bBuffer, 0, cntBufferSize)) != -1) {
out.write(bBuffer, 0, count);
}
origin.close();
}
}
out.close();
return true;
} catch (Exception e) {
return false;
}
}