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How to convert Java Serialisable Object to Byte Array

Posted on 2000-03-31
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Last Modified: 2012-06-27
Hi,
does anybody know how to convert a Java Object like Image Object into a byte[] to do stuff with it after....

For exemple if i create serialisable object and i want to store them in database in byte []

help !
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Question by:NextOne
7 Comments
 
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Expert Comment

by:Nevyn
ID: 2672685
The is a couple of classes in the io package called ByteArrayOutputStream and ByteArrayInputStream. Wrap these with any OutputStream you desire and you have your byte[].
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Expert Comment

by:heyhey_
ID: 2672803
you need
java.awt.image.PixelGrabber

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Accepted Solution

by:
Jim Cakalic earned 50 total points
ID: 2674086
Specifically, to serialize a Serializable object to a byte array:

    Object o = <whatever>;
    ByteArrayOutputStream bst = new ByteArrayOutputStream();
    ObjectOutputStream ost = new ObjectOutputStream(bst);
    ost.writeObject(o);
    ost.flush();
    byte[] b = bst.toByteArray();

To deserialize from the byte array:

    byte[] b = <whatever>;
    ByteArrayInputStream bst = new ByteArrayInputStream(b);
    ObjectInputStream ost = new ObjectInputStream(bst);
    Object o = ost.readObject();

Best regards,
Jim Cakalic
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Author Comment

by:NextOne
ID: 2674258
I prefere the Jim cakalic answer that is full of explenation and very interesting... I gonna try

thanks to everybody
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Author Comment

by:NextOne
ID: 2674275
thanks, i gonna try
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LVL 16

Expert Comment

by:heyhey_
ID: 2675598
>> how to convert a Java Object like Image Object into a byte[]

well - java.awt.Image is not Serializable :)
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Author Comment

by:NextOne
ID: 2675826
Well yes, but i found a solution, i read directly the file...
But i use a Sybase DataBase and I've a stream problem,
I can only read 32768 bytes...
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