Download user selected file/upload a file to a user selected directory both with primefaces
<p>I want to download user selected files with primefaces. I was able to do so for a specific file as described in the primface showcase for "file Download". But what I actually want is, that after pressing the "download Button" a file dialog should open, so the user can select a file for himself to download. Is that possible?</p>

<p>My current code for a specific file download lokks like this:</p>

<pre><code>    public void handleLanguageFileDownload() throws FileNotFoundException, IOException {

        FacesContext fc = FacesContext.getCurrentInstance();
        ExternalContext ec = fc.getExternalContext();

        File fileToDownload = new File(DataManager.configreader.getLang_source());
        String fileName = fileToDownload.getName();
        String contentType = ec.getMimeType(fileName);
        int contentLength = (int) fileToDownload.length();

        ec.responseReset(); 
        ec.setResponseContentType(contentType); 
        ec.setResponseContentLength(contentLength); 
        ec.setResponseHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\""); 

        OutputStream output = ec.getResponseOutputStream();

        Files.copy(fileToDownload.toPath(), output);

        fc.responseComplete(); 
}
</code></pre>

<p>I want the exact same behaviour for file upload, so the user can select the folder to upload files to for himself. My current implementation uploads the file only to a specific folder.</p>

<p>My current code for uploading files to a specific folder looks like this:</p>

<pre><code>    public void handleLanguageFileUpload(FileUploadEvent event) throws IOException {

        if (!this.role.canManageLanguage){
            return;
        }

        String [] filePathParts =     DataManager.configreader.getLang_source().split("/");
        String uploadPathString = DataManager.configreader.getLang_source().replaceAll(filePathParts[filePathParts.length - 1],""); //event.getFile().getFileName()
        File uploadPath = new File(uploadPathString);
        File fileToUpload = new File(uploadPath, event.getFile().getFileName());

        try (InputStream input = event.getFile().getInputstream()) {
            if(event.getFile().getFileName().equals(filePathParts[filePathParts.length - 1])) { //fileToUpload.getName()
            Files.copy(input, fileToUpload.toPath(), StandardCopyOption.REPLACE_EXISTING);
            uiManager.userMessage.info (event.getFile().getFileName() + " " + this.translate("msg_has_been_uploaded") + " !");
            this.getOwnTreeVersion();
            }
            else {
                uiManager.userMessage.error (event.getFile().getFileName() + " " + this.translate("msg_is_wrong_cannot_be_uploaded") +": " + filePathParts[filePathParts.length - 1] + " !");
            }
        }
    }
</code></pre>

<p>Thank you in advance for your help!!!</p>