Hello,
In a nutshell, since GAE cannot write to a filesystem, I have decided to
persist my data into the
datastore (using JDO). Now, I will like to retrieve the data byte by byte
and pass it to the client
as an input stream. There's code from the gwtupload library (see below)
which breaks on GAE
because it writes to the system filesystem. I'll like to be able to provide
a GAE ported solution.
public static void copyFromInputStreamToOutputStream(InputStream in,
OutputStream out) throws IOException {
byte[] buffer = new byte[100000];
while (true) {
synchronized (buffer) {
int amountRead = in.read(buffer);
if (amountRead == -1) {
break;
}
out.write(buffer, 0, amountRead);
}
}
in.close();
out.flush();
out.close();
}
One work around I have tried (didn't work) is to retrieve the data from the
datastore as a resource like this:
InputStream resourceAsStream = null;
PersistenceManager pm = PMF.get().getPersistenceManager();
try {
Query q = pm.newQuery(ImageFile.class);
lf = q.execute();
resourceAsStream = getServletContext().getResourceAsStream((String)
pm.getObjectById(lf));
} finally {
pm.close();
}
if (lf != null) {
response.setContentType(receivedContentTypes.get(fieldName));
copyFromInputStreamToOutputStream(resourceAsStream,
response.getOutputStream());
}
I welcome your suggestions.
Regards
--
Odeyemi 'Kayode O.
http://www.sinati.com
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