Tools to Capture and Convert the Web

Callback Handler with Java

Java API


Having problems debugging your handler? Try the Callback Handler Test Tool.

The handler or web hook described here processes callbacks from the GrabzIt screenshot web service. The URL of this handler is passed to GrabzIt in the callBackURL parameter of the Save method. However this technique will only work if the handler is accessible via the Internet.

The following parameters are passed to the handler as GET parameters.

If you want to block all access to the handler, except from GrabzIt then use this security technique.


Remember this callback will not work if your application is located on localhost.

This example shows how the GrabzIt Java handler can be implemented. This captures six parameters passed to it from the GrabzIt service, including the unique id of the screenshot which is passed to the GetResult method.

This method then returns the screenshot, which is saved in the results directory.

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException
        String message = request.getParameter("message");
        String customId = request.getParameter("customid");
        String id = request.getParameter("id");
        String filename = request.getParameter("filename");
        String format = request.getParameter("format");
        String targetError = request.getParameter("targeterror");

        GrabzItClient client = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret")%>");

        GrabzItFile file = client.GetResult(id);

        if (file == null)

        String path = getServletContext().getRealPath("/results") + File.separator + filename;

        catch(Exception ex)
            //You should log any errors