Writing objects over nio

[Rikard Qvarforth]

how to convert a lets say a Person obj to ByteBuffer so one can send over a socketShannel and the reconstruct the Person object, im looking for a ObjectOutputstream/ObjectInputstream over nio ?
:roll:

[Ron Hitchens]

ByteBuffers and channels deal only with arrays of bytes, they have no conception of things like ObjectStreams.
Sending a serialized object graph over an NIO channel is no different than sending any other chunk of bytes. You just need to obtain the bytes representing your serialized object and write it to the channel. Here are two ways to do so:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream (baos);
oos.writeObject (myObjectToSerialize);
oos.flush();
channel.write (ByteBuffer.wrap (baos.toByteArray()));

or

ObjectOutputStream oos = new ObjectOutputStream (Channels.newOutputStream (myWritableByteChannel));
oos.writeObject (myObjectToSerialize);
oos.flush();

In the first case, you've got the encoded object graph in a ByteBuffer instance and could do other things with it if you like. The second uses a utility adapter class which will handle the conversion from stream to channel for you.

[Rikard Qvarforth]

oh many thanks i dident get that one could do chaining with nio this was nice because im after the non blockable read/write methods in nio. im doing a little server/client progg.so i thougth that it would be nice with nio thanks !