2nd execution of download jsp always gives error

Question

I have got a download button in my html which executes the server page Filedownload.jsp. The download executes fine, but I cannot invoke it again without refreshing the html screen. Otherwise I get an error.
This is how the jsp is invoked from my html:
document.location='FileDownload.jsp?ReportTypeDir=' + ReportTypeStr +
'&MonthDir=' + MonthStr + '&filename=' + DownLoadFileStr;
And this is my jsp:
<%@ page contentType = "application/vnd.ms-excel" %>
<%@page language = "java" import = "java.util.*, java.io.*, javax.servlet.*, java.text.*" %>
<%
String filepath = "c:\\Pace\\" + request.getParameter("ReportTypeDir") + "\\" + request.getParameter("MonthDir");
String filename = request.getParameter("filename") + ".xls";
File file = new File(filepath + "\\" + filename);
byte b[] = new byte[(int)file.length()];
response.setHeader("Content-Disposition", "attachment; filename=\"" + filename +"\";");
if (file.isFile())
BufferedInputStream fin = new BufferedInputStream(new FileInputStream(file));
BufferedOutputStream outs = new BufferedOutputStream(response.getOutputStream());
int read = 0;
while((read = fin.read(b)) !=-1){
outs.write(b,0,read);
}//end of while
outs.close();
fin.close();
}//end of if
%>
How can I avoid getting this error message.
Thanks in advance
Nongo

Answer 1

I'm suprised that it even worked the first time. Since your jsp calls response.getWriter() to give you the implicit 'out' variable, it would be illegal to call response.getOutputStream() in your jsp.