[iText-questions] why PdfStamper can write to FileOutputStream but not to ServletOutputStream

[gs lai]

I want to read a file and change something,then to the browser and I see 
nothing,but to a file which is i want,Can you tell where is my wrong(with 
j2sdk1.4.1_03,tomcat4.1.24,iText1.02b,MS ie6.0sp1).thanks for your doing for 
us,and your help
the code is:

public class PrintProtocolUsePdfAction
   extends org.apache.struts.action.Action {
   public ActionForward execute(ActionMapping mapping,
                              ActionForm form,
                              HttpServletRequest request,
                              HttpServletResponse response) throws 
Exception {
       ByteArrayOutputStream baos = new ByteArrayOutputStream();
       response.setHeader("Cache-Control", "max-age=30");
       response.setHeader("Content-Type", "application/pdf");
       PdfReader reader = new PdfReader("D:\\Tomcat 
4.1\\webapps\\tms\\docs\\protocol1.pdf");
       PdfStamper stamp = new PdfStamper(reader,new 
FileOutputStream("D:\\Tomcat 4.1\\webapps\\tms\\docs\\obj.pdf"));//(1)
//      PdfStamper stamp = new PdfStamper(reader,baos);//(2)
       AcroFields aform = stamp.getAcroFields();
       aform.setField("text1", "hello,iText");
       stamp.setFormFlattening(true);
       ServletOutputStream out= response.getOutputStream();
       baos.flush();
       baos.writeTo(out);
       stamp.close();
       out.flush();
       baos.reset();
       return null
   }
}

notes:
(1)write to file,and it is ok!
(2)write to browser,then it doesn't work.why?
thanks again.
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