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();
}
}
}

Copying Jar file without corruption

I need to copy a .jar file (which is a resource in my project) from a separate runnable jar to the startup folder in windows. Here's the code I have so far.
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class Installer {
public static void main(String[] args) throws IOException
{
InputStream source = Installer.class.getResourceAsStream("prank.jar");
byte[] buffer = new byte[source.available()];
source.read(buffer);
File targetFile = new File(System.getProperty("user.home") + File.separator + "AppData\\Roaming\\Microsoft\\Windows\\Start Menu\\Programs\\Startup\\prank.jar");
OutputStream outStream = new FileOutputStream(targetFile);
outStream.write(buffer);
outStream.close();
}
}
My problem is that after the jar file is copied, it is corrupt (although the size of the original and the copy are the same.) Any thoughts on how to do this and have a runnable jar at the end of the process?

Refer to InputStream#available does not work.
The following line
byte[] buffer = new byte[source.available()];
is not correct, as available only return estimate of the size, the jar will be corrupted when estimate is different with actual. (Example from Java – Write an InputStream to a File) seems incorrect as I can't find any reference that guarantee correctness of available for FileInputStream.
Solution from How to convert InputStream to File in Java is more robust,
private static void copyInputStreamToFile(InputStream inputStream, File file)
throws IOException {
try (FileOutputStream outputStream = new FileOutputStream(file)) {
int read;
byte[] bytes = new byte[1024];
while ((read = inputStream.read(bytes)) != -1) {
outputStream.write(bytes, 0, read);
}
// commons-io
//IOUtils.copy(inputStream, outputStream);
}
}
You can consider to use
IOUtils#copy(InputStream, OutputStream)
Files#copy(InputStream, Path, CopyOption...) suggested by Holger for jdk 1.7 or above

Try this -
Path source = Paths.get("location1/abc.jar");
Path destination = Paths.get("location2/abc.jar");
try {
Files.copy(source, destination);
} catch(FileAlreadyExistsException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

Cannot open generated zip file

I've followed several articles to create a zip file using java ZipOutputStream class. The zip is created but I cannot open it. On my Mac I'm receiving this message when I open it with the unzip command :
End-of-central-directory signature not found. Either this file is not
a zipfile, or it constitutes one disk of a multi-part archive. In the
latter case the central directory and zipfile comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile
directory in one of /Users/xxxx/Downloads/iad.zip or
/Users/xxxx/Downloads/iad.zip.zip, and cannot find /Users/xxxx/Downloads/iad.zip.ZIP, period.
My java class :
import lombok.experimental.UtilityClass;
import lombok.extern.slf4j.Slf4j;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import static java.util.Arrays.stream;
#Slf4j
#UtilityClass
public class ZipCreator {
public byte[] compressAll(String... files) throws IOException {
try (ByteArrayOutputStream baos = new ByteArrayOutputStream();
ZipOutputStream zipOut = new ZipOutputStream(baos)) {
stream(files)
.forEach(file -> addToZip(zipOut, file));
return baos.toByteArray();
}
}
private static void addToZip(ZipOutputStream zipOut, String file) {
File fileToZip = new File(file);
try (FileInputStream fis = new FileInputStream(fileToZip.getCanonicalFile())) {
zipOut.putNextEntry(new ZipEntry(fileToZip.getName()));
byte[] bytes = new byte[1024];
int length;
while ((length = fis.read(bytes)) >= 0) {
zipOut.write(bytes, 0, length);
}
} catch (IOException e) {
log.error("Error when adding file {} to zip", file, e);
}
}
}
Doas anyone have an idea to get this zip open ?

You forgot to call closeEntry(). And you should call close() for ZipOutputStream before baos.toByteArray():
public static byte[] compressAll(String... files) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try (ZipOutputStream zipOut = new ZipOutputStream(baos)) {
stream(files).forEach(file -> addToZip(zipOut, file));
}
return baos.toByteArray();
}
private static void addToZip(ZipOutputStream zipOut, String file) {
File fileToZip = new File(file);
try (FileInputStream fis = new FileInputStream(fileToZip.getCanonicalFile())) {
zipOut.putNextEntry(new ZipEntry(fileToZip.getName()));
byte[] bytes = new byte[1024];
int length;
while ((length = fis.read(bytes)) >= 0) {
zipOut.write(bytes, 0, length);
}
zipOut.closeEntry();
} catch (IOException e) {
log.error("Error when adding file {} to zip", file, e);
}
}
For ByteArrayOutputStream you must close ZipOutputStream before retrieve byte array from ByteArrayOutputStream.
For FileOutputStream is the same. You must close ZipOutputStream before closing FileOutputStream. Note that the close methods of resources are called in the opposite order of their creation.
public static void compressAll(String... files) throws IOException {
try (FileOutputStream fos = new FileOutputStream("test.zip");
ZipOutputStream zipOut = new ZipOutputStream(fos)) {
stream(files).forEach(file -> addToZip(zipOut, file));
}
}

File Not Found Exception, Access is Denied, Java

I made a Program which moves all files of a folder to another folder but when I'm executing the Program it shows me java.io.FileNotFound Exception and Access is denied
I tried to fix this error but it is still giving me the same error.
What am I doing wrong?
I have also attached the screenshot of Error I am getting.
when I checked the properties of the folder it was read-only, I changed but still, the Issue Persists
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class MoveFile
{
public static void main(String\[\] args)
{
InputStream inStream = null;
OutputStream outStream = null;
try{
File afile =new File("C:\\Users\\admin\\Desktop\\A");
File bfile =new File("C:\\Users\\admin\\Desktop\\B");
inStream = new FileInputStream(afile);
outStream = new FileOutputStream(bfile);
byte\[\] buffer = new byte\[1024\];
int length;
while ((length = inStream.read(buffer)) > 0){
outStream.write(buffer, 0, length);
}
inStream.close();
outStream.close();
afile.delete();
System.out.println("File Moved!");
}catch(IOException e){
e.printStackTrace();
}
}
}
I expect the Files of folder A to move in Folder B.

according to your question description , you try to move all file of a folder to another folder...
to do this you can use this code ....
public static void main(String[] args) throws IOException {
String from = "C:/Users/Infra/Desktop/PBL/A";
String to = "C:/Users/Infra/Desktop/PBL/B";
File folder = new File(from);
File[] listOfFiles = folder.listFiles();
for (File file : listOfFiles) {
Path temp = Files.move(Paths.get(from +"/"+ file.getName()),
Paths.get(to +"/"+ file.getName()));
}
}

How to rename and move a file using java code without erasing the content

On renaming and moving a file using java code,the contents of the file is removed.How to rename and move a file using java code without erasing the content

Please use below code, it can rename and copy the file into different folder
package han.code.development;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class FileRenameandMove
{
public static void main(String[] args) throws IOException
{
File file=new File("D:\\Haneef\\Stackoverflow\\files.txt");
FileReader fileR=new FileReader(file);
BufferedReader bufferedReader=new BufferedReader(fileR);
String str=bufferedReader.readLine();
FileWriter fileW=new FileWriter(new File("D:\\Haneef\\Stackoverflow\\Move\\File1.txt"));
fileW.write(str);
fileW.close();
}
}

try{
File afile =new File("C:\\Users\\Jen\\Downloads\\usage.csv");
File bfile =new File("C:\\Users\\Jen\\Desktop\\BJ\\");
inStream = new FileInputStream(afile);
outStream = new FileOutputStream(bfile + "\\"+ dd.get(j).getText()+ "_March _2018.csv");
Thread.sleep(1000);
byte[] buffer = new byte[1024];
int length;
//copy the file content in bytes
while ((length = inStream.read(buffer)) > 0){
outStream.write(buffer, 0, length);
}
inStream.close();
outStream.close();
// if file copied successfully then delete the original file
afile.delete();
System.out.println("File moved successfully");
}catch(IOException e){
e.printStackTrace();
}
}