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  [FIXED] Problems serializing objects and sending over network  (Read 861 times)
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« Posted 2012-02-15 17:59:57 »

I don't really know what im doing wrong, just trying to send an object called 'packet' from server to client using TCP.
This is how its serialized and sent server side
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 bos = new ByteArrayOutputStream();
 objectOut = new ObjectOutputStream(bos);
 objectOut.writeObject(packet);
 String objectBytes = bos.toString();
               
 ps.println(objectBytes); // ps is a printstream, ps = new PrintStream(skt.getOutputStream());

Here is the client side code
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 String data = br.readLine();

 byte[] objectData = data.getBytes();
 // Deserialize from a byte array
bis = new ByteArrayInputStream(objectData);
 in = new ObjectInputStream(bis);
 packet = (Packet) in.readObject();
 in.close();


This is sending strings, i tried doing it by just sending a the length of the byte array, then the byte array and reciving it like that client side but just couldnt get it working. Ive had several errors probably most commen is this 'java.io.StreamCorruptedException: invalid stream header', but i also get a 'java.io.EOFException' error. Am i go going about this completely the wrong way?
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« Reply #1 - Posted 2012-02-15 18:19:39 »

Accidently 'converting' your binary data to text will corrupt your data.

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 bos = new ByteArrayOutputStream();
 objectOut = new ObjectOutputStream(bos);
 objectOut.writeObject(packet);
 // String objectBytes = bos.toString();
@@ objectOut.close();
byte[] data = objectOut.toByteArray();

dataOutputStream.writeInt(data.length);
dataOutputStream.write(data);
dataOutputStream.flush();


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  int len = dataInputStream.readInt();
 byte[] objectData = new byte[len];
 dataInputStream.readFully(objectData);
 // byte[] objectData = data.getBytes();

 // Deserialize from a byte array
bis = new ByteArrayInputStream(objectData);
 in = new ObjectInputStream(bis);
 packet = (Packet) in.readObject();
 in.close();

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Offline Embedded

Junior Member


Medals: 1



« Reply #2 - Posted 2012-02-15 18:31:35 »

Augh thanks, seems to be working now. Just buggy but thats the rest of my code i think Smiley
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