Download file using HtmlUnit

Question

I am trying to download xls file for a website. When I click the link to download the file, I get a javascript confirm box. I handle it like below

    ConfirmHan         


        

Answer 1

Expanding on Roy's answer, here's my solution to this problem:

public static void prepareForDownloadingFile(WebClient webClient, File output) {
    webClient.addWebWindowListener(new WebWindowListener() {

        public void webWindowOpened(WebWindowEvent event) {
        }

        public void webWindowContentChanged(WebWindowEvent event) {
            Page page = event.getNewPage();
            FileOutputStream fos = null;
            InputStream is = null;
            if (page != null && page instanceof UnexpectedPage) {
                try {
                    fos = new FileOutputStream(output);
                    UnexpectedPage uPage = (UnexpectedPage) page;
                    is = uPage.getInputStream();
                    IOUtils.copy(is, fos);
                    webClient.removeWebWindowListener(this);
                } catch (Exception e) {
                    e.printStackTrace();
                } finally {
                    try {
                        if (fos != null)
                            fos.close();
                        if (is != null)
                            is.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }

        }

        public void webWindowClosed(WebWindowEvent event) {
        }
    });
}

I felt there were enough differences to make it a new answer:
-Doesn't have a magic variable (response)
-Closes InputStream and FileOutputStream
-Looks for UnexpectedPage to determine we're not on a HTML page
-Downloads a file one time after requesting then removes itself
-Doesn't require knowing the ContentType

Calling this once before, for example, clicking a button that initiates a download, will download that file.