read images from filesystem

[neko069]

Good afternoon.
I have a big doubt with the APIs of SmartGwt.
It exists some way to get a lot of image files, to build, mmmm a photoAlbum?
I have in mind build a photo visor y a way of iTunes coverflow, but i would like to obtain images from a specified folder..
The question is, like i said, how can i obtain images from my filesystem, and put in a component in client side??

[phuqit]

You're out of luck here. Browsers are somewhat limited regarding submitting multiple files (that is, you can't just select a folder and upload everything in it). Two possible workarounds are
1) flash-based file/folder selector
2) active-x component

Other than that, you're stuck to uploading files one by one.


There are some facilities for batch file upload in smartgwt, take a look at that too.

regards,
Andrius J.

[neko069]

mmmmm i think i did not explain my doubt in a properly way..
i donīt want a component to upload multiple files, i looking for a way
to get a file(s) from a filesystem of the server, and show in a smart gwt or gwt form, because i read that JavaScript canīt do that...
I mean how can i transform an InputStream(that contains my image file) and redirect that InputStream in a label, to mention an example...

[levi]

1) Whatever file is in your .war, you can access directly via http.
Probably not what you want for your photo album though.

2) Create a FileDownloadServlet taking a filename/path as parameter which returns an image (works with anything really). There are a lot of good examples out there.
Since the servlet runs on a server, it can access any file from any filesystem (it has access to).

For example: http://host/app/servlets/DownloadServlet?get=somefile.jpg
You can set that URL on any SmartGWT (you probably want class Img).

[phuqit]

I use the following spring framework snippet to download files:

    @RequestMapping("/fileDownload.do")
    void downloadFile(HttpServletResponse response, @RequestParam(value = "id", required = true) String id,
                      @RequestParam(value = "thumb", required = false) String thumbnail) throws IOException {
        // get the file info 
        MediaInfo info = mediaInfoRepository.get(id);
        response.setBufferSize(info.getSize() > 1024 * 1024 ? 1024 * 1024 : (int) info.getSize());
        String filename = thumbnail == null ? info.getFilename() : thumbnail;
        response.setHeader("Content-Disposition", "inline; filename=\"" + filename + "\"");
response.setContentType(servletContext.getMimeType(info.getFilename()));
        File file = new File(UPLOAD_DIRECTORY + File.separator + info.getDirectory() + File.separator + filename);
        response.setContentLength((int) file.length());
        FileCopyUtils.copy(new BufferedInputStream(new FileInputStream(file)), response.getOutputStream());
    }

This code returns either the image itself, or a thumbnail for it, depending on the "thumb" request parameter.

regards,
Andrius J.

[neko069]

Thanks to every one to answer me, i resolved my problem with this tutorial


http://ikaisays.com/2010/09/08/gwt-blobstore-the-new-high-performance-image-serving-api-and-cute-dogs-on-office-chairs/