I don't think it is possible to create an image using base64 encoded data.
Even if it were possible, you don't want to do it for a lot of reasons,
namely
a) RPC uses POST, which is not easily cacheable
b) Its a waste of bandwidh. RPC and base64 both have their overheads
c) You have to deal with the asynchronous nature of RPC
d) Its non-intuitive, and a lot more work
i cannot fetch it directly from the client since this image needs to be
> registered in the session of the GWT-server - image servlet, if i fetch it
> from the client it will be registered in the client session with the image
> servlet.
Could you explain this statement? It looks to me you are confused with the
concept of sessions. Serving images via a servlet is a pretty standard
technique, you need to better explain your problems with that approach.
--Sri
On 18 May 2010 23:57, Professor Vagner <professorvag...@javaneses.com>wrote:
> Try this.
>
>
> import com.google.gwt.user.client.rpc.RemoteService;
> import com.google.gwt.user.client.rpc.RemoteServiceRelativePath;
>
> /**
> * The client side stub for the RPC service.
> */
> @RemoteServiceRelativePath("greet")
> public interface GreetingService extends RemoteService {
> String getImage(String name) throws IllegalArgumentException;
> }// end GreetingService
>
>
> ##############################################################################
>
> /**
> * The async counterpart of <code>GreetingService</code>.
> */
> public interface GreetingServiceAsync {
> void getImage(String input, AsyncCallback<String> callback)
> throws IllegalArgumentException;
> }// end GreetingServiceAsync
>
>
> ##############################################################################
>
> package testes.gwt.server;
>
> import java.io.FileInputStream;
>
> import sun.misc.BASE64Encoder;
> import testes.gwt.client.GreetingService;
>
> import com.google.gwt.user.server.rpc.RemoteServiceServlet;
>
> /**
> * The server side implementation of the RPC service.
> */
> public class GreetingServiceImpl extends RemoteServiceServlet implements
> GreetingService {
>
> private static final long serialVersionUID = -7242788956943039085L;
>
> public String getImage(String input) throws IllegalArgumentException {
>
> try {
> BASE64Encoder base64Encoder = new BASE64Encoder();
> FileInputStream fileInputStream = new
> FileInputStream("myImage");
>
> byte[] buffer = new byte[fileInputStream.available()];
>
> StringBuilder stringBuilder = new StringBuilder();
> stringBuilder.append("data:image/png;base64,");
> fileInputStream.read(buffer);
> stringBuilder.append(base64Encoder.encode(buffer));
> return stringBuilder.toString();
> } catch (Exception e) {
> e.printStackTrace();
> }// end catch
> return null;
> }// end getImage
> }// end GreetingServiceImpl
>
>
>
> ##############################################################################
>
>
> public void onFailure(Throwable caught) {}
>
> public void onSuccess(String result) {
> if (!img.isVisible())
> img.setVisible(true);
> img.getElement().setPropertyObject("src", result);
> } // end onSuccess
>
>
> --
> Professor Vagner
>
> O PLANETA É O MEU PAÍS, E A CIÊNCIA É A MINHA RELIGIÃO ! INDO AO INFINITO E
> ALÉM... !!!!!!
>
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