使用非序列化部件进行Java序列化

Effective Java

class MyClass extends MyClass2 implements Serializable{

  public MyClass(int quantity) {
    setNonSerializableProperty(new NonSerializableClass(quantity));
  }

  private void writeObject(java.io.ObjectOutputStream out)
  throws IOException{
    // note, here we don't need out.defaultWriteObject(); because
    // MyClass has no other state to serialize
    out.writeInt(super.getNonSerializableProperty().getQuantity());
  }

  private void readObject(java.io.ObjectInputStream in)
  throws IOException {
    // note, here we don't need in.defaultReadObject();
    // because MyClass has no other state to deserialize
    super.setNonSerializableProperty(new NonSerializableClass(in.readInt()));
  }
}

/* this class must have no-arg constructor accessible to MyClass */
class MyClass2 {

  /* this property must be gettable/settable by MyClass.  It cannot be final, therefore. */
  private NonSerializableClass nonSerializableProperty;

  public void setNonSerializableProperty(NonSerializableClass nonSerializableProperty) {
    this.nonSerializableProperty = nonSerializableProperty;
  }

  public NonSerializableClass getNonSerializableProperty() {
    return nonSerializableProperty;
  }
}

class NonSerializableClass{

  private final int quantity;

  public NonSerializableClass(int quantity){
    this.quantity = quantity;
  }

  public int getQuantity() {
    return quantity;
  }
}

private transient Foo foo;

private transient SomeClass myClz;

Kryo object->bytes->object

Kryo kryo = new Kryo();
// #### Store to disk...
Output output = new Output(new FileOutputStream("file.bin"));
SomeClass someObject = ...
kryo.writeObject(output, someObject);
output.close();
// ### Restore from disk...
Input input = new Input(new FileInputStream("file.bin"));
SomeClass someObject = kryo.readObject(input, SomeClass.class);
input.close();

kryo.register(SomeObject.class, new DeflateCompressor(new FieldSerializer(kryo, SomeObject.class)));

writeObject() readObject() java.io.Serializable

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