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Compression of a seriaizable object

Posted on 2004-04-12
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270 Views
Last Modified: 2011-04-14
I'm looking for a simple example of compressing a serializable object using the GZIPInputStream and GZIPOutputStream classes in java.util.zip package.  Any help will be greatly appreciated.
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Question by:mwalker
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6 Comments
 
LVL 4

Accepted Solution

by:
brunomsilva earned 50 total points
ID: 10808968

to write:

FileOutputStream fos = new FileOutputStream(filename);
GZIPOutputStream gzos = new GZIPOutputStream(fos);    
ObjectOutputStream out = new ObjectOutputStream(gzos);
out.writeObject(new String("test string"));

to read:

FileInputStream fis = new FileInputStream(filename);
GZIPInputStream gzis = new GZIPInputStream(fis);
ObjectInputStream in = new ObjectInputStream(gzis);
String test = (Vector)in.readObject();  // this depends on what you want to write

don't forget to add the exception handling

cheers,
 bruno
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LVL 14

Assisted Solution

by:Tommy Braas
Tommy Braas earned 25 total points
ID: 10808987
ObjectOutputStream oos = new ObjectOutputStream(new GZIPOutputStream(new FileOutputStream(myFile)));
oos.writeObject(mySerializableObject);

ObjectInputStream ois = new ObjectInputStream(new GZIPInputStream(new FileInputStream(myFile)));
Object deserialized = ois.readObject();
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LVL 3

Assisted Solution

by:int_20h
int_20h earned 25 total points
ID: 10809002
// Serialize & Zip
{
  MyObject myobj = new MyObject();
  FileOutputStream fos = new FileOutputStream("data.dat");
  GZIPOutputStream gos = new GZIPOutputStream(fos);
  ObjectOutputStream oos = new ObjectOutputStream(gos);
  oos.writeObject(myobj);
}
// Unzip & De-serialize
{
  MyObject myobj = null;
  FileInputStream fis = new FileInputStream("data.dat");
  GZIPInputStream gis = new GZIPInputStream(fis);
  ObjectInputStream ois = new ObjectInputStream(gis);
  myobj = (MyObject) ois.readObject();  
}
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LVL 14

Expert Comment

by:Tommy Braas
ID: 10809176
int_20h, please don't post already posted information
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LVL 3

Expert Comment

by:int_20h
ID: 10809249
Sorry... I was writting the information when there was no answer.  After I answer I saw all other replies!
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LVL 14

Expert Comment

by:Tommy Braas
ID: 10809405
That's ok. ;-)
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