Unzipping Multipart file with and without subdirectories

Question

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

2. abc.zip(Mutlipart File)

   -folder1--bio.csv(file)-folder-2(inside folder1)-arkan.csv,dan.csv,kud.csv
   

3. abc.zip(Mutlipart File)

   -arkan.csv,dan.csv,kud.csv
   

Answer 1

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;
        }