Trying the file channel reader:
More here
->
http://code.google.com/p/gwt-examples/wiki/DemoGAEMultiFileBlobUpload?ts=1303485150&updated=DemoGAEMultiFileBlobUpload
private byte[] getImageBytes_v2(BlobData blobData) {
if (blobData == null || blobData.getKey() == null) {
return null;
}
BlobKey blobKey = new BlobKey(blobData.getKey());
FileService fileService = FileServiceFactory.getFileService();
AppEngineFile file = null;
try {
file = fileService.getBlobFile(blobKey);
} catch (FileNotFoundException e) {
log.severe("getImageBytes_V2(): Error: fileService error " +
e.toString());
e.printStackTrace();
}
if (file == null) {
return null;
}
FileReadChannel ch = null;
try {
ch = fileService.openReadChannel(file, false);
} catch (FileNotFoundException e) {
log.severe("getImageBytes_V2(): Error: file not found " + e.toString());
e.printStackTrace();
} catch (LockException e) {
log.severe("getImageBytes_V2(): Error: lock exception " + e.toString());
e.printStackTrace();
} catch (IOException e) {
log.severe("getImageBytes_V2(): Error: file read channel - io exception "
+ e.toString());
e.printStackTrace();
}
if (ch == null) {
return null;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] array = new byte[1024];
ByteBuffer buf = ByteBuffer.wrap(array);
try {
while (ch.read(buf) != -1) {
buf.rewind();
byte[] a = buf.array();
try {
out.write(a);
} catch (Exception e) {
log.severe("getImageBytes_V2(): Error: buffered out error " +
e.toString());
e.printStackTrace();
}
buf.clear();
}
} catch (IOException e) {
log.severe("getImageBytes_V2(): Error: io exception reading channel " +
e.toString());
e.printStackTrace();
}
byte[] filebytes = out.toByteArray();
return filebytes;
}
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