Client side - silent print of PDF

[mikael vivier]

Hey everyone, I need some help here !

So I want to print with no user interaction some PDF on the client browser.
For this, I use a servlet and an iframe in my JSP, this way the PDF file is not open :

The servlet :

public class PdfPrintServlet extends HttpServlet {
 
	/**
	 * Explains how to print silently via Servlet/Browser.
	 * @author     Bikram Shrestha, [e-mail]
	 */
	private static final long serialVersionUID = 1L;
 
	public void doGet(HttpServletRequest request, HttpServletResponse response)
	throws IOException, ServletException{
 
		response.setContentType("application/pdf");
 
		URL url = new URL(request.getParameter("url"));
		try {
			PdfReader reader = new PdfReader(url);
			PdfStamper stamper = new PdfStamper(reader,response.getOutputStream());
            PdfWriter writer = stamper.getWriter();
            
            StringBuffer javascript = new StringBuffer();
            
			javascript.append("var params = this.getPrintParams();");
 
			javascript.append("params.interactive =	params.constants.interactionLevel.silent;");
			javascript.append("params.pageHandling = params.constants.handling.shrink;");
 
			javascript.append("this.print(params);");
			
			PdfAction pdfAction= PdfAction.javaScript(javascript.toString(), writer);
			writer.addJavaScript(pdfAction);
			
			stamper.close();
 
		} catch (DocumentException de) {
			de.printStackTrace();
			System.err.println("document: " + de.getMessage());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

The JSP code :
<iframe src="http://localhost:8080/mvn_printauto/pdfPrintServlet?url=http://localhost:8080/tmp.pdf" width="40%" height="80" scrolling="yes" style="display:none"> </iframe>
It's working pretty fine except it is not completely a silent print since there is a confirmation message from Adobe reader : http://www.freeimagehosting.net/acea3

So my question is what can I do for prevent this message to show up and print the PDF automatically ?

[Tim Moores]

That's not possible, and that's a good thing: imagine the security implications if any random web app could start printing documents on the client side without an user interaction!

[mikael vivier]

Yeah I understand but I imagine there were some trick in Adobe Reader to accept this print request at each times, without users interactions (I can configure all the users PC) ?