How to user Scanner check if a Zip file compressed by CSV or other type of files in JAVA?

Question

I am trying to use Scanner read ZipInputStream line by line, below is the code i have

                    ZipInputStream inputStream = new ZipInputStream(bodyPartEntity.getInputStream());
                    inputStream.getNextEntry();
                    Scanner sc = new Scanner(inputStream);
                    while (sc.hasNextLine()) {
                        log.info(sc.nextLine());
                    }

and it works fine.

But I have a question, what if a user compressed an image or different type of files (not CSV) as a Zip. Is there a way that I can check that so I can throw an exception for it? Also, is there a way to read next file?

For now, if I compressed multiple files, I'm only able to read one. And then sc.hasNextLine() will be equal to false.

Anyway, I can read the next file?

Answer 1

you should loop over your zip file like this:

ZipEntry entry;
while((entry = inputStream.getNextEntry())!=null){
  // do your logic here...
  // for example: entry.getName()
}

For the file type, you could use something like this, inside of while loop:

MimetypesFileTypeMap mtft = new MimetypesFileTypeMap();
String mimeType = mtft.getContentType(entry.getName());
System.out.println(entry.getName()+" type: "+ mimeType);

Happy coding!