Document streaming in jsp

hi there,
i'm trying to stream some pdfs to the user's browser so that the first page of the pdf displays whilst the rest of the document loads.
i have been able to get this to work when i call a file directly from the file system but i need to be able to stream the file to the user. the file streams successfully but only when the entire file has been read. can anyone suggest what i'm doing wrong ?
here is my code :
BufferedInputStream in = null;
OutputStream sos = null;
byte[] buffer = new byte[1024 * 4];
int r = 0;
try {
in = new BufferedInputStream(new FileInputStream(f));
sos = response.getOutputStream();
while ((r = in.read(buffer, 0, buffer.length)) != -1) {
sos.write(buffer, 0, r);
sos.flush();
sos.flush();
} finally {
if(in != null) in.close();
if(sos != null) sos.close();
many thanks in advance ...

there is a standard one:
HttpServlet.getLastModified() Why reinvent a wheel?
Paul

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