I think the public part is assumed. If your images are located in
public/category then they should be accessible via the URL:
String imageURL = GWT.getModuleBaseURL() + "category/" + fileName;
if you want to create a directory somewhere else on the host machine
disk (i.e. not part of the Tomcat set up) to store the images you need
to do more work. You could use an ordinary HttpServlet (not a GWT RPC
servet) to do it, something like:
// assume you have passed "category" and "imageFileName" as
parameters to the servlet.
// in HttpServlet.doGet(..)
FileInputStream in = new FileInputStream(new File(UPLOAD_DIRECTORY/
+ category/ + ImageFileName))
response.setContentType("image/jpeg"); // or gif,png etc
OutputStream out = response.getOutputStream();
try {
byte[] buffer = new byte[1024];
int len;
while ((len = in.read(buf)) > 0) {
out.write(buffer, 0, len);
}
in.close();
out.close();
} catch (IOException e) {
// do something
}
The effect of that it to make the browser believe it's just getting an
image from a URL. You can't use GWT RPC because it won't deal with
binary data (e.g. an image file). Look up "HttpServlet image download"
on Google for examples.
On Jan 6, 4:00 pm, Daniele <[email protected]> wrote:
> I put category folder under public/ folder.
> Same problem.
> I do set UPLOAD_DIRECTORY with
> ./src/com/webphotogallery/public/category because only public/category
> doesn't work.
>
> I try to create a temp directory on /home/dany/TESI/project and we'll
> put in directory images that I use in my application
>
> Daniele
>
> 2009/1/4, gregor <[email protected]>:
>
>
>
> > Hi Daniele,
>
> > Your problem is that:
>
> > private static String UPLOAD_DIRECTORY =
> > "./src/com/webphotogallery/server/category/";
>
> > does not exist under the temporary GWT dev shell Tomcat instance
> > created when you run hosted mode, whatever your development
> > environment. To sort this out you will have to think through where in
> > a production environment the photos would actually be stored.
>
> > To do this quick and get it to work in hosted mode, I think if you put
> > them under the /public directory rather than /server, it might do the
> > trick.
>
> > regards
> > gregor
>
> > On Jan 4, 1:13 pm, Daniele <[email protected]> wrote:
> >> It's doesn't work.
> >> My project directory structure is:
>
> >> /home/dany/TESI/projects/WebPhotoGallery/
> >> -- build/
> >> -- src
> >> -- com
> >> -- webphotogallery
> >> -- server
> >> -- category
> >> -- [...]
> >> -- client
> >> -- public
> >> -- tomcat
> >> -- WebConten
>
> >> (I use Eclipse with Cypal studio plugin)
>
> >> On servlet, the code for create category directory is:
>
> >> private static String UPLOAD_DIRECTORY =
> >> "./src/com/webphotogallery/server/category/";
> >> [...]
>
> >> if((it.getFieldName().equals("categoryBox"))){
> >> String categoryFolder = it.getString();
>
> >> UPLOAD_DIRECTORY = UPLOAD_DIRECTORY +
> >> categoryFolder;
> >> [...]
> >> where categoryFolder is passed by client with a form.
> >> But when I call setURL() method on client, what URL I
> >> put??http://localhost:8888/com.webphotogallery.WebPhotoGallery/category/ca...
> >> not works.
>
> >> I'm totally disoriented.
>
> >> Thanks.
>
> >> Daniele.
>
> >> 2008/12/28 Daniele <[email protected]>:
>
> >> > Sorry, but I'm newbie of servlet & GWT...I'm here for learning GWT and
> >> > servlet :)
> >> > I try.
> >> > Thanks.
>
> >> > Daniele.
>
> >> > 2008/12/28 rakesh wagh <[email protected]>:
>
> >> >> Cannot comment on what you are doing wrong without looking into the
> >> >> code. However I see no need for setUrl on server side. You should have
> >> >> a "Servlet" that will parse the parameters, read the appropriate image
> >> >> file(either file system or db or any doc mgmt system for that matter),
> >> >> set a proper content type and just spit out the byte stream.
>
> >> >> From the client just call this servlet with appropriate params for it
> >> >> to retrieve the image. In essence:
> >> >> Image img = new Image();
> >> >> img.setUrl("/servlet?photoId=39934&width=50");
>
> >> >> Rakesh Wagh
>
> >> >> On Dec 26, 4:26 pm, Daniele <[email protected]> wrote:
> >> >>> I cannot planning image manipulation.
> >> >>> If images are on client sides, setUrl() etc it works.
>
> >> >>> On server side, I have an undefined number of folders that represent
> >> >>> photo category, but if I put on setUrl() method path to folders on
> >> >>> server, it's not work.
>
> >> >>> 2008/12/26 rakesh wagh <[email protected]>:
>
> >> >>> > ask yourself:
> >> >>> > Even if you get your image/files using rpc, what will you do with
> >> >>> > it?
> >> >>> > I mean there is no real application of getting binary files using
> >> >>> > rpc
> >> >>> > yet. Are you planning to do image manipulations like rotation,
> >> >>> > filters, etc on the client side? js is not yet ready for that.
> >> >>> > However
> >> >>> > if you wish, you can get the entire file using rpc method. But
> >> >>> > sticking it to the image tag is very difficult. Search through the
> >> >>> > group, some one mentioned how you can embed the actual bytes and
> >> >>> > construct a img tag that will display the image. Good luck, because
> >> >>> > that is very non standard and your millage can greatly vary.
>
> >> >>> > You might also want to look at Gears, it allows you to store and
> >> >>> > retrieve Blobs in client database... not sure if it has to do
> >> >>> > anything
> >> >>> > with your requirement but will come handy if you are playing a lot
> >> >>> > with files etc. ..
>
> >> >>> > Rakesh Wagh
>
> >> >>> > On Dec 24, 8:01 am, Daniele B <[email protected]> wrote:
> >> >>> >> Hi.
> >> >>> >> I work on a photogallery application for my thesis.
> >> >>> >> I have a problem.
> >> >>> >> How can I do to retrieve image files stored on a server folder
> >> >>> >> trought
> >> >>> >> GWT-RPC?
>
> >> >>> >> Thanks at all!
> >> >>> >> Sorry fo my english!!! :)
>
> >> >>> >> Daniele.
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