ServletOutputStream out = response.getOutputStream();
String fileName = request.getParameter("file");
out.println("<html>");
out.println("<head>");
out.println("<title>Welcome</title>");
out.println("</head>");
out.println("<body>");
out.println("<h2>The File</h2>");
out.println(fileName);
out.println("</body>");
out.println("</html>");
out.close();