Hi, Can you please show a sample code ....how you guys solved this?
please!
On Apr 19, 5:53 am, ahmet terzioglu <ahmet.terzio...@gmail.com> wrote:
> Yes, that is exactly what I did and it works now, thank you.
>
>
>
> On Sun, Apr 18, 2010 at 10:51 PM, Trevis <trevistho...@gmail.com> wrote:
> > Is your goal to show the image in an img tag in the web browser? I
> > have user uploadable images on my gwt website and to present the
> > images to users i use an http servlet. I have an img tag rendered in
> > the client that references the image from the servlet. Since my
> > images are saved in the DB, the image servlet processes the users
> > request, finds the image that they are requesting and renders the file
> > to the output stream. Pretty much all you need to do is configure the
> > content type on the response.
>
> > On Apr 15, 9:48 am, Ahmet <ahmet.terzio...@gmail.com> wrote:
> > > Hi everyone,
>
> > > My application has an upload file feature and allow users to upload
> > > image files to the server using an httpServlet. That part works fine,
> > > the file gets uploaded and placed in the WEB-INF folder (I don't want
> > > public access), required url and other info is filled into the
> > > database using Hibernate.
>
> > > The problem is when I want to retrieve the image on the client side.
> > > My user pojo knows the url of its image, but I can't instantiate an
> > > Image object and send it over an RPC call since it is not
> > > serializable. I decided to transform the image file, a jpg, into a
> > > byte[] on the server side and then transfer the byte[] over the RPC
> > > call, however, I it doesn't work.
>
> > > I get no errors on the server side, the RPC call returns, but my
> > > client reports a failure:
>
> > > SEVERE: Exception while dispatching incoming RPC call
> > > java.lang.RuntimeException: java.lang.ClassCastException: [B cannot be
> > > cast to [Ljava.lang.Object;
>
> > > My service code:
> > > public byte[] getImageByUrl(String url) {
>
> > > ByteArrayOutputStream baos = new ByteArrayOutputStream();
> > > try{
> > > File file = new File(url);
> > > ObjectOutputStream oos = new
> > ObjectOutputStream(baos);
> > > oos.writeObject(file);
> > > }catch(Exception ioe){
> > > ioe.getMessage();
> > > }
> > > return baos.toByteArray();
>
> > > }
>
> > > My client code:
> > > service.getImageByUrl(url, new AsyncCallback<byte[]>() {
> > > @Override
> > > public void onFailure(Throwable
> > arg0) {
> > > log("getImageByUrl
> > failed");
> > > log(arg0.getMessage());
> > > }
> > > @Override
> > > public void onSuccess(byte[]
> > arg0) {
> > > //reconstruct file
> > > }
>
> > > }
>
> > > I send a byte[] and recieve a byte[], I checked the contents of the
> > > array from the server side, it is not null and gets returned, however
> > > the client side can not accept it... Why can this be ?
>
> > > I have done some research and it seems like using an httpServlet is
> > > better than using an RPC call when making a binary data transfer,
> > > therefore I am inclined to using the httpServlet for downloading the
> > > image, however what I ultimately achive is not having to save the file
> > > on my client side to access its content. Is it possible to transfer
> > > the Image object over the httpServlet to dynamically use it as it is
> > > recieved on the client side ?
>
> > > I am not sure about using data://url s as they are not supported by
> > > all browsers, but seems as the simplest solution.
>
> > > Thank you for your opinions..
>
> > > Regards,
> > > Ahmet
>
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