Gregor wrote "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 can add your external directory to tomcat's path. So basically D:
\images could be pathed to localhost:8080/YourApp/images
Then you can access them very easily using GWT by creating an Image
object and calling setURL("images/mycat.jpg");
Look at this to set up your path:
http://whatwouldnickdo.com/wordpress/157/tomcat-images-directory/
On Jan 6, 12:06 pm, gregor <[email protected]> wrote:
> I think the public part is assumed. If yourimagesare located in
> public/category then they should be accessible via the URL:
>
> String imageURL = GWT.getModuleBaseURL() + "category/" + fileName;
>
> if you want to create adirectorysomewhere else on the host machine
> disk (i.e. not part of theTomcatset up) to store theimagesyou 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 tempdirectoryon /home/dany/TESI/project and we'll
> > put indirectoryimagesthat 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 shellTomcatinstance
> > > 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 /publicdirectoryrather 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 projectdirectorystructure 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 categorydirectoryis:
>
> > >> 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.
> > >> >>> Ifimagesare 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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