Re: byte array to Image

Hello Magallo

You can use a code like this:

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    response.setContentType("image/png");

    if(request.getParameter("id") != null) {

       if(request.getParameter("id").equals("")) {

          response.sendError(500, "Bad request | Please provide an existing ...?id=X");

       }

      else {

        int mapID = Integer.parseInt(request.getParameter("id"));

        byte[] image = null;

        try {

           yourClientWrapper wrapper = yourDao.readById((long) mapID);

           image = wrapper.getYourImage();

        }

        catch (Exception e) {

           e.printStackTrace();

        }

         OutputStream out = response.getOutputStream();

         out.write(image);

         out.close();

      }

}

    else {

       response.sendError(500, "Bad request | Please provide an existing id with ...?id=X");

    }

}

On the client side: You just insert your Servlet-Url as the Image Resource (src-Attribute) like http://www.yourfancyurl.com/yourgwtapplication/servlet/imageGetter?id=31) and that's it. The servlet returns the image to the corresponding id without saving it to the disk.

I hope that this little explanation helps :)

Best regards

Am Montag, 4. Juni 2012 12:34:14 UTC+2 schrieb Magallo:

Excuse me Agito M, I'm intereseted in this solution. You said that "Code on the client side didn't change from what I earlier posted.". What do you mean? How do you call the servlet and how do you process the result and create the image client side? Please, could you possibly post some code to let me understand this? Thanks.

Il giorno martedì 27 settembre 2011 12:56:12 UTC+2, AgitoM ha scritto:

Decided to deal with the 32kb limit in Internet Explorer 8. (Internet
Explorer 9 is not a problem).
Dealt with the problem by creating a servlet that outputs the byte
array as a image.
I'm sending the ID of the image, in this case a map, to the servlet
using the GET method.

This is the code for the doGet operation for my dedicated
ImageServlet:

protected void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
                response.setContentType("image/png");

                if(request.getParameter("MapID") != null) {
                        int mapID = Integer.parseInt(request.getParameter("MapID"));

                        byte[] image = null;
                        try {
                                image = wsStub.getMapImage(mapID);
                        }
                        catch (Exception e) {
                                e.printStackTrace();
                        }

                        OutputStream out = response.getOutputStream();
                        out.write(image);
                        out.close();
                }
        }

On my RPC Servlet side, I simply return this as the "URL" of the
image:
("ImageServlet?MapID=" + mapID)

Code on the client side didn't change from what I earlier posted.

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