Whats wrong with this zip method?

I have a method which zips up 5 files. It produces a zip file without error, but I cannot open it to examine the contents. I tried emailing it and gmail said it cannot send corrupt files. Trying to open with WinRAR in Windows results in an error stating:

The archive is either in unknown format or damaged

This is the method:

private void zipTestFiles() throws FileNotFoundException, IOException
    File[] filenames = fileDir.listFiles(fileNameFilter(Constants.PAGE_MON_FILENAME_FILTER));

    byte[] buf = new byte[1024];

    String outFilename = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separatorChar + Constants.PAGEMONITOR_ZIP;
    DeflaterOutputStream out = new DeflaterOutputStream(new BufferedOutputStream(new FileOutputStream(outFilename)));

    for (int i=0; i<filenames.length; i++)
        FileInputStream in = new FileInputStream(filenames[i]);

        int len;
        while ((len = in.read(buf)) > 0)
            out.write(buf, 0, len);



You should use ZipOutputStream instead of DeflaterOutputStream. And do not forget to create entries. Read javadoc of ZipOutputStream before writing the implementation.

Try with ZipOutputStream which already exists in Java. DeflaterOutputStream only uses DEFLATE method to compress but doesn't put ZIP headers automatically.

Need Your Help

Python - SkLearn Logistic Regression: One-by-one train instance

python scikit-learn logistic-regression

Here is my question, I have a huge train set so I can't load it in memory and apply this code.

About UNIX Resources Network

Original, collect and organize Developers related documents, information and materials, contains jQuery, Html, CSS, MySQL, .NET, ASP.NET, SQL, objective-c, iPhone, Ruby on Rails, C, SQL Server, Ruby, Arrays, Regex, ASP.NET MVC, WPF, XML, Ajax, DataBase, and so on.