Why can't I write a PNG file correctly on Windows with Java from a downloaded source?

I'm trying to write a PNG file from a image retrieved from the web. This is what I'm doing (the http code and IOUtils magic are both from Apache):

public static void main(Stri开发者_如何学编程ng[] args) throws Exception {
    HttpClient client = new DefaultHttpClient();
    HttpGet get = new HttpGet(new URI("http://tinyurl.com/krb43g"));
    HttpResponse response = client.execute(get);
    HttpEntity entity = response.getEntity();
    byte[] data = IOUtils.toByteArray(entity.getContent());
    File tempFile = File.createTempFile("Picture", ".png");
    Writer writer = new BufferedWriter(new FileWriter(tempFile));
    IOUtils.write(data, writer);
    writer.close();
    Runtime.getRuntime().exec("rundll32.exe \"C:\\Program Files (x86)" +
            "\\Windows Photo Viewer\\PhotoViewer.dll\", ImageView_Fullscreen "
            + tempFile.getAbsolutePath());
}

The image comes out corrupted in some way and Windows cannot display it. Am I doing something wrong with the write?

You're using a Writer when you should be using an OutputStream. Try replacing the lines that involve a Writer with the following:

OutputStream stream = new FileOutputStream(tempFile);
IOUtils.write(data, stream);
stream.close();