if you only want to display an image there's no need for a form
this might be useful:
http://bit.ly/2Wgvtm
On 19 Nov., 20:22, Martin Trummer <martin.trum...@24act.at> wrote:
> what are you trying to do?
>
> what is the form good for?
> does it upload the image and afterwards you want to display this
> uploaded image?
>
> On 19 Nov., 13:01, zhangj5 <jianzhan...@gmail.com> wrote:
>
> > Hi all,
> > I have a question about how to handle image/gif type response on
> > client side, any suggestion will be great.
> > There is a service which responds for retrieving image (only one each
> > time at the moment) from database. The code is something like,
>
> > JDBC Connection
> > Construct MYSQL query.
> > Execute query
> > If has ResultSet, retrieve first one {
> > image = rs.getBlob("img"); //save image into Blob image, “img” is the
> > only entity in the image table.
>
> > }
>
> > Then,
> > response.setContentType("image/gif"); //set response type
> > InputStream in = image.getBinaryStream(); //output Blob image to
> > InputStream
> > int bufferSize = 1024; //buffer size
> > byte[] buffer = new byte[bufferSize]; //initial buffer
> > int length =0;
> > while ((length = in.read(buffer)) != -1) {//read length data from
> > inputstream and store into buffer
> > out.write(buffer, 0, length); //write into
> > ServletOutputStream}
>
> > in.close();
> > out.flush(); //write out
>
> > The code on client side
> > ....
> > imgform.setAction(GWT.getModuleBaseURL() + "serviceexample/
> > ImgRetrieve");
> > ....
> > ClickListener {
> > OnClick, then imgform.submit();
>
> > }
>
> > formHandler {
>
> > onSubmit, form validation
>
> > onSubmitComplete
> > ??????? //handle response, and display image
> > Here is my question, i had tried
> > Image img = new Image(GWT.getHostPageBaseURL()
> > +"serviceexample/ImgRetrieve");
> > mg.setSize("300", "300");
> > imgpanel.add(img);
> > but i only got a non-displayed image with 300X300 size.
>
> > }
>
> > So, how should i handle the responde in this case?
>
> > Thanks,
>
>
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