File download problem

I am using the following code to present a file to the client to download when a report is generated. The code does what is suppose to, it presents a dialog box where the user can choose to open, save, or cancel the file download. However, when the file is downloaded it contains the client HTML at the bottom of the saved file. I checked the created file on the server and it does not contain the HTML at the bottom, so it is being added by the following jsp code when the file is presented to the user. Any help would be appreciated. BTW, this running on HP-UX 11i using oracle forms 10G.
   String RPT = request.getParameter("trig");
   String SDATE = request.getParameter("start_date");
   String EDATE = request.getParameter("end_date");
   String PRN = request.getParameter("prn");
if(RPT != null)
     try {
          Runtime rt1;
          Process proc1;
          String[] doRefresh = {"/usr/bin/sh", "-c", "/usr/local/oracle/sql/st_tags/some_script '" + SDATE + "' '" + EDATE + "' '" + PRN + "'"};
          rt1 = Runtime.getRuntime();
          proc1 = rt1.exec(doRefresh);
          int exitVal = proc1.waitFor();
       String filename="/usr/local/oracle/sql/st_tags/temp/some_file.csv";
       response.setContentType("application/octet-stream");
       String disHeader="Attachment; Filename=some_file.csv";
       response.setHeader("Content-Disposition", disHeader);
       File fileToDownload=new File(filename);
       InputStream in=null;
       ServletOutputStream outs=response.getOutputStream();
       try {
          in=new BufferedInputStream
          (new FileInputStream(fileToDownload));
          int ch;
          while((ch=in.read()) != -1) {
          outs.print((char) ch);
       finally {
          if(in != null) in.close();
       outs.flush();
       outs.close();
       in.close();
     catch (Exception ignored) {}
   }

Sorry, wasn't sure how important the HTML portion would be. Thanks for the response. Here is the HTML that is before and after the afore mentioned code.
Before:
<%@page import="java.lang.*, java.net.*, java.util.*, java.io.*"%>
<%@page pageEncoding="UTF-8" contentType="text/html;charset=windows-1252"%>
<%@page language="java" import="mil.uspfo.dpi.*" errorPage="default.jsp" %>
<jsp:useBean id="AgnosticHostBean" class="mil.uspfo.dpi.AgnosticHostBean"
scope="session">
</jsp:useBean>
<base href="http://<% out.print(AgnosticHostBean.getHostNameProperty() ); %>
:7779/j2ee/">
<html>
<head>
<title>Master Report</title>
<link rel="stylesheet" type="text/css" href="styles/uspfo.css">
</head>
<body>
<%@ include file="header.html" %>
<h1>
Master Report
</h1>
<form name="mstr_form" method="post">
<p>Start Date:<input type="date" name="start_date">(example: YYYYMMDD)</p>
<p>End Date :<input type="date" name="end_date">(example: YYYYMMDD)</p>
<p>Payroll # :<input type="text" name="prn"></p>
<input type="SUBMIT" name="Button1" onClick="get_mstr_report()">
<input type="hidden" name="trig" size="2">
<br>
<script type="text/javascript">
function get_mstr_report() {
document.mstr_form.trig.value="go";
</script>AFTER:
</form>
<br>
<%@ include file="footer.html" %>
</body>
</html>

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We experienced the exact same problem as the OP (including corrupt files named "f.pdf" and the browser dialog box he documented). Don't know if his environment is similar, but here is how we fixed our issue:
Our app uses an Authentication Scheme that includes under "Page Session Management" a "Session Verify Function" called like this: "return timeout_pkg.check_timeout;". This timeout_pkg I think came from code originally posted here, it works well so thanks to the original coder. However it does present a small issue in that it rewrites the mime headers in the server response in one use case. Since it is rewriting the headers to "text/html" even though we are sending back a report where the mime header should be "application/pdf", the client gets confused and the result is the symptoms the OP posted.
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Edited by: cmcneil on Sep 5, 2008 11:45 AM
Edited by: cmcneil on Sep 5, 2008 11:59 AM

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Edited by: Pablo Casamayor on Dec 28, 2011 5:49 PM

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After downloading a number of 1.0 MB files, the system became very sluggish, and I started to get lots of (Not Responding) messages when trying to download or just use Firefox for browsing. Using Performance Monitor, I observed that the Firefox executable was growing larger and larger - up to as large as 1.2 GB on a system with 2.0 GB memory. Page faults were off the chart.
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Hi Katy, and a warm welcome to the forums!
What is the exact name of the file?
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