Question

Is there any way to know in Servlet is JS is enable or not on browser? Also want flash version which installed on browser. I want all this information at Servlet only. We need to log this information at our end.

Answer 1

There is a way,

1. Add a new Servlet with some name like JsServlet

2. Add a no script tag

   < noscript>

      < img src="{PATH TO YOUR SERVLET}" >
   
   < /noscript>
   

3. Return some blank image from the Servlet

4. If this Servlet get called you can get that the browser dose not support script.

Edit : The servlet code will be,

public class JsServlet extends HttpServlet{

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

  /*Write your code that you wan't */
  /*You are here means the browser dose not support javaScript*/

  BufferedImage buffer = new BufferedImage(1, 1,
                            BufferedImage.TYPE_INT_RGB);
  response.setContentType("image/png");
                        OutputStream os =   response.getOutputStream();
                        ImageIO.write(bufferedImage, "png", os);
                        os.close();

}