Develop Reference

Unable to delete specific files after unzipping the files

Am new to Java, I searched in google for unzipping the files. Tested the code in my local and am able to unzip the files.
But unable to delete the files I tried some logic but no luck.
Can anyone help me how read a particular file and delete that file using its path and also need to delete a specific folder using its path and delete recursively. all the other files need to be there
Below is the code:
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.DirectoryStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class UnzipFiles {
public static void main(String[] args) {
String zipFilePath = "/Users/Safeer_Pasha/Music/archive.zip";
String destDir = "/Workspace/";
unzip(zipFilePath, destDir);
}
private static void unzip(String zipFilePath, String destDir) {
File dir = new File(destDir);
// create output directory if it doesn't exist
if(!dir.exists()) dir.mkdirs();
FileInputStream fis;
//buffer for read and write data to file
byte[] buffer = new byte[1024];
try {
fis = new FileInputStream(zipFilePath);
ZipInputStream zis = new ZipInputStream(fis);
ZipEntry ze = zis.getNextEntry();
while(ze != null){
String fileName = ze.getName();
File newFile = new File(destDir + File.separator + fileName);
System.out.println("Unzipping to "+newFile.getAbsolutePath());
//create directories for sub directories in zip
new File(newFile.getParent()).mkdirs();
FileOutputStream fos = new FileOutputStream(newFile);
int len;
while ((len = zis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
fos.close();
//close this ZipEntry
zis.closeEntry();
ze = zis.getNextEntry();
}
//close last ZipEntry
zis.closeEntry();
zis.close();
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

How to implement Parallel Zip Creation with ScatterZipOutputStream with Zip64 Support?

I am wondering if any one can help implementing Parallel Zip Creation using ScatterZipOutputStream . I have searched a lot but no where I am finding an example for the same.
https://commons.apache.org/proper/commons-compress/zip.html
I have tried making Zip, Zipping a directory etc with ZipArchiveOutputStream . Now, I am trying to do that in parallel.
public static void makeZip(String filename) throws IOException,
ArchiveException {
File sourceFile = new File(filename);
final OutputStream out = new FileOutputStream(filename.substring(0, filename.lastIndexOf('.')) + ".zip");
ZipArchiveOutputStream os = new ZipArchiveOutputStream(out);
os.setUseZip64(Zip64Mode.AsNeeded);
os.putArchiveEntry(new ZipArchiveEntry(sourceFile.getName()));
IOUtils.copy(new FileInputStream(sourceFile), os);
os.closeArchiveEntry();
os.close();
}
It should be able to process individual files as thread and then combine it to write the result zip.

Following is the working code of both zip and unzip:
1. Change path for sourceFolder and zipFilePath
2. Zipping only *.text type of files it can be any type or all the files
3. Unzipped files at sourceFolder/unzip/
Import following dependency in build.gradle or in pom.xml
implementation("org.apache.commons:commons-compress:1.18")
implementation("commons-io:commons-io:2.6")
Ref: https://mvnrepository.com/artifact/org.apache.commons/commons-compress/1.18
https://mvnrepository.com/artifact/commons-io/commons-io/2.6
//code
import org.apache.commons.compress.archivers.zip.*;
import org.apache.commons.compress.parallel.InputStreamSupplier;
import org.apache.commons.io.FileUtils;
import java.io.*;
import java.nio.file.Files;
import java.util.Iterator;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class ZipMain {
static ParallelScatterZipCreator scatterZipCreator = new ParallelScatterZipCreator();
static ScatterZipOutputStream dirs;
static {
try {
dirs = ScatterZipOutputStream.fileBased(File.createTempFile("java-zip-dirs", "tmp"));
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws IOException {
String sourceFolder = "/Users/<user>/Desktop/";
String zipFilePath = "/Users/<user>/Desktop/Desk.zip";
String fileTypesToBeAddedToZip = "txt";
zip(sourceFolder, zipFilePath, fileTypesToBeAddedToZip);
unzip(zipFilePath, sourceFolder + "/unzip/");
}
private static void zip(String sourceFolder, String zipFilePath, String fileTypesToBeAddedToZip) throws IOException {
OutputStream outputStream = null;
ZipArchiveOutputStream zipArchiveOutputStream = null;
try {
File srcFolder = new File(sourceFolder);
if (srcFolder.isDirectory()) {
// uncomment following code if you want to add all files under srcFolder
//Iterator<File> fileIterator = Arrays.asList(srcFolder.listFiles()).iterator();
Iterator<File> fileIterator = FileUtils.iterateFiles(srcFolder, new String[]{fileTypesToBeAddedToZip}, true);
File zipFile = new File(zipFilePath);
zipFile.delete();
outputStream = new FileOutputStream(zipFile);
zipArchiveOutputStream = new ZipArchiveOutputStream(outputStream);
zipArchiveOutputStream.setUseZip64(Zip64Mode.AsNeeded);
int srcFolderLength = srcFolder.getAbsolutePath().length() + 1; // +1 to remove the last file separator
while (fileIterator.hasNext()) {
File file = fileIterator.next();
// uncomment following code if you want to add all files under srcFolder
//if (file.isDirectory()) {
// continue;
// }
String relativePath = file.getAbsolutePath().substring(srcFolderLength);
InputStreamSupplier streamSupplier = () -> {
InputStream is = null;
try {
is = Files.newInputStream(file.toPath());
} catch (IOException e) {
e.printStackTrace();
}
return is;
};
ZipArchiveEntry zipArchiveEntry = new ZipArchiveEntry(relativePath);
zipArchiveEntry.setMethod(ZipEntry.DEFLATED);
scatterZipCreator.addArchiveEntry(zipArchiveEntry, streamSupplier);
}
scatterZipCreator.writeTo(zipArchiveOutputStream);
}
if (zipArchiveOutputStream != null) {
zipArchiveOutputStream.close();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (outputStream != null) {
outputStream.close();
}
}
}
private static void unzip(String zipFilePath, String destDir) {
File dir = new File(destDir);
// create output directory if it doesn't exist
if (!dir.exists()) {
dir.mkdirs();
} else {
dir.delete();
}
FileInputStream fis;
//buffer for read and write data to file
byte[] buffer = new byte[1024];
try {
fis = new FileInputStream(zipFilePath);
ZipInputStream zis = new ZipInputStream(fis);
ZipEntry ze = zis.getNextEntry();
while (ze != null) {
String fileName = ze.getName();
File newFile = new File(destDir + File.separator + fileName);
System.out.println("Unzipping to " + newFile.getAbsolutePath());
//create directories for sub directories in zip
String parentFolder = newFile.getParent();
File folder = new File(parentFolder);
folder.mkdirs();
FileOutputStream fos = new FileOutputStream(newFile);
int len;
while ((len = zis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
fos.close();
//close this ZipEntry
zis.closeEntry();
ze = zis.getNextEntry();
}
//close last ZipEntry
zis.closeEntry();
zis.close();
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
Ref: Fast zipping folder using java ParallelScatterZipCreator

Java Basics - Looping through folder

I am very new to java and coming from a js background. I am attempting to loop through a folder full of files and zipping it. Currently, I have done the zipping part successfully, but doing by statically adding the files. The answer is obviously a loop from a programming perspective. I am having trouble looping a list and making it equal to the zipping method below. Online Resources are not making sense much sense to me due to my beginner skill.
package zipFile;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class ZipFiles {
public static void main(String[] args) {
try {
FileOutputStream fos = new FileOutputStream("atest.zip");
ZipOutputStream zos = new ZipOutputStream(fos);
String file1Name = "src/resources/text1";
String file2Name = "src/resources/text2";
String file3Name = "src/resources/text3";
String file4Name = "src/resources/text4";
String file5Name = "src/resources/text5";
String file6Name = "src/resources/text6";
addToZipFile(file1Name, zos);
addToZipFile(file2Name, zos);
addToZipFile(file3Name, zos);
addToZipFile(file4Name, zos);
addToZipFile(file5Name, zos);
addToZipFile(file6Name, zos);
zos.close();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void addToZipFile(String fileName, ZipOutputStream zos) throws FileNotFoundException, IOException {
System.out.println("Writing '" + fileName + "' to zip file");
File file = new File(fileName);
FileInputStream fis = new FileInputStream(file);
ZipEntry zipEntry = new ZipEntry(fileName);
zos.putNextEntry(zipEntry);
byte[] bytes = new byte[1024];
int length;
while ((length = fis.read(bytes)) >= 0) {
zos.write(bytes, 0, length);
}
zos.closeEntry();
fis.close();
}
}

The answer is in this article: http://www.baeldung.com/java-compress-and-uncompress
This code zips multiple files (Very similar to your code but slightly changed):
public class ZipMultipleFiles {
public static void main(String[] args) throws IOException {
List<String> srcFiles = Arrays.asList("test1.txt", "test2.txt");
FileOutputStream fos = new FileOutputStream("multiCompressed.zip");
ZipOutputStream zipOut = new ZipOutputStream(fos);
for (String srcFile : srcFiles) {
File fileToZip = new File(srcFile);
FileInputStream fis = new FileInputStream(fileToZip);
ZipEntry zipEntry = new ZipEntry(fileToZip.getName());
zipOut.putNextEntry(zipEntry);
byte[] bytes = new byte[1024];
int length;
while((length = fis.read(bytes)) >= 0) {
zipOut.write(bytes, 0, length);
}
fis.close();
}
zipOut.close();
fos.close();
}
}
EDIT:
This line in the code creates an array that is easy to go through in a while loop:
List<String> srcFiles = Arrays.asList("test1.txt", "test2.txt");

basically used finding children of a folder method thanks to Elliotk link. I am making the string equal to the path of the parent folder - >checking if whether if its a directory - > list its files -> get the names and while loop to write all of them to a zipped folder
here is my whole code
package zipfolder2;
import java.io.*;
import java.util.*;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
public class zipfolders2 {
public static void main(String[] args) {
try {
String sourceFile = "src/resources";
FileOutputStream fos = new FileOutputStream("zippedfiles.zip");
ZipOutputStream zipOut = new ZipOutputStream(fos);
File fileToZip = new File(sourceFile);
zipFile(fileToZip, fileToZip.getName(), zipOut);
zipOut.close();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
private static void zipFile(File fileToZip, String fileName, ZipOutputStream zipOut) throws IOException {
if (fileToZip.isHidden()) {
return;
}
if (fileToZip.isDirectory()) {
File[] children = fileToZip.listFiles();
for (File childFile : children) {
zipFile(childFile, fileName + "/" + childFile.getName(), zipOut);
}
return;
}
FileInputStream fis = new FileInputStream(fileToZip);
ZipEntry zipEntry = new ZipEntry(fileName);
zipOut.putNextEntry(zipEntry);
byte[] bytes = new byte[1024];
int length;
while ((length = fis.read(bytes)) >= 0) {
zipOut.write(bytes, 0, length);
}
fis.close();
}
}

Unzip file in java/jsp

I am unziping a file using java.
Long ago, somewhere I've got this class in the internet, and I stole and kept it for my own usage. The complete class is:
package pubapp.data;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
public class UnzipUtility {
private static final int BUFFER_SIZE = 4096;
public void unzip(String zipFilePath, String destDirectory) throws IOException {
File destDir = new File(destDirectory);
if (!destDir.exists()) {
destDir.mkdir();
}
ZipInputStream zipIn = new ZipInputStream(new FileInputStream(zipFilePath));
ZipEntry entry = zipIn.getNextEntry();
// iterates over entries in the zip file
while (entry != null) {
String filePath = destDirectory + File.separator + entry.getName();
if (!entry.isDirectory()) {
// if the entry is a file, extracts it
extractFile(zipIn, filePath);
} else {
// if the entry is a directory, make the directory
File dir = new File(filePath);
dir.mkdir();
}
zipIn.closeEntry();
entry = zipIn.getNextEntry();
}
zipIn.close();
}
private void extractFile(ZipInputStream zipIn, String filePath) throws IOException {
try (BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filePath))) {
byte[] bytesIn = new byte[BUFFER_SIZE];
int read = 0;
while ((read = zipIn.read(bytesIn)) != -1) {
bos.write(bytesIn, 0, read);
}
}
}
}
This works in my local computer (windows 7, jdk_1.7, tomcat) fine. But when I upload war to remote hosting, it does no work as expected. It does not create the sub directories. Web hosting is using Debian/Ubuntu, jdk_1.7, tomcat-7.x
What is wrong with this code in linux?

Generate .tar.gz file in java

I generated .tar.gz file in java.
When I tried to open that,I m getting exception as "Unable to read header of that file" and it asks for some over writing also.
It is also throwing error as
cannot open file:it does not appear to be a valid archive.
My code is as follows
import java.io.File;
import java.io.FileInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
public class Tarzlatest {
public static void main(String[] args) {
File file =new File(path);
String gzipFile = path;
String newFile = path ;
compressGzipFile(file, gzipFile);
decompressGzipFile(gzipFile, newFile);
}
private static void decompressGzipFile(String gzipFile, String newFile) {
try {
FileInputStream fis = new FileInputStream(gzipFile);
GZIPInputStream gis = new GZIPInputStream(fis);
FileOutputStream fos = new FileOutputStream(newFile);
byte[] buffer = new byte[1024];
int len;
while((len = gis.read(buffer)) != -1){
fos.write(buffer, 0, len);
}
//close resources
fos.close();
gis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private static void compressGzipFile(File dir, String gzipFile) {
try {
File[] flist = dir.listFiles();
for(int i=0; i<flist.length; i++)
{
FileInputStream fis = new FileInputStream(flist[i]);
FileOutputStream fos = new FileOutputStream(gzipFile);
GZIPOutputStream gzipOS = new GZIPOutputStream(fos);
byte[] buffer = new byte[1024];
int len;
while((len=fis.read(buffer)) != -1){
gzipOS.write(buffer, 0, len);
}
//close resources
gzipOS.close();
fos.close();
fis.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

It means that you generated your .tar.gz incorrectly. Simple as that.