void handleFileUpload(HttpServletRequest request, HttpServletResponse response)
throws IOException {
try {
ServletFileUpload upload = createUpload();
FileItemIterator iter = upload.getItemIterator(request);
while (iter.hasNext()) {
FileItemStream item = iter.next();
if (!item.isFormField()) {
receive(item);
}
}
if (tracker.isEmpty()) {
String errorMessage = "No file upload data found in request";
tracker.setException(new Exception(errorMessage));
tracker.handleFailed();
response.sendError(HttpServletResponse.SC_BAD_REQUEST, errorMessage);
} else {
tracker.handleFinished();
}
} catch (Exception exception) {
Throwable cause = exception.getCause();
if (cause instanceof FileSizeLimitExceededException) {
exception = (Exception) cause;
}
tracker.setException(exception);
tracker.handleFailed();
int errorCode =
exception instanceof FileSizeLimitExceededException
? HttpServletResponse.SC_REQUEST_ENTITY_TOO_LARGE
: HttpServletResponse.SC_INTERNAL_SERVER_ERROR;
response.sendError(errorCode, exception.getMessage());
}
}
private void receive(FileItemStream item) throws IOException {
InputStream stream = item.openStream();
try {
String fileName = stripFileName(item.getName());
String contentType = item.getContentType();
FileDetails details = new FileDetailsImpl(fileName, contentType);
FileUploadReceiver receiver = handler.getReceiver();
receiver.receive(stream, details);
tracker.addFile(details);
} finally {
stream.close();
}
}