SetContentType, Header or ??

Question

Hi, first post so kid gloves please!
OS debian sarge
tomcat 5.0.19
j2sdk1.4.2_04
I have a minor but irritating problem. I have a servlet which produces a CSV file and prompts to save, and it works OK. The problem is that an unwanted blank browser window is spawned at the same time. The html page in the browser does not create the new window via JS etc.
I guess the method I have used is responsible, and any pointers to my errors would be appreciated. The bit of code below has all relevent stuff on it, further population of the file being done with out.println
public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
     // get the data sent along with request.
     CustCode = request.getParameter("custCode");
     UserAuthority = request.getParameter("authCode");
     SessionCode = request.getParameter("sessionCode");
     Selection = request.getParameter("selection");
     //send back.
     //response.setContentType("application/x-download");
     response.setContentType("octet-stream");
     response.setHeader("Content-disposition","attachment; filename=Example.CSV");
     PrintWriter out = response.getWriter();
     // send headers
out.println("Serial,Reading,Date");
     // open db and send data from there
     openJDBC(out);

Answer 1

response.setContentType("octet-stream");First things first, your MIME type is incorrectly specified.
response.setContentType("application/octet-stream"); // media type for a generic resource
//response.setContentType("application/csv");  //this also works