问题
I now understand that scala @serializable objects can be used the same as a Java Serializable object. In a Java Serializable object there are methods you can override to change how the object streams: writeObject(ObjectOutputStream) / readObject(ObjectOutputStream).
Can you override or inject methods into a scala @serializable object allowing you to change how the object serializes?
回答1:
Yes, you can use the same methods in Scala as in Java:
@throws(classOf[IOException])
private def writeObject(out: ObjectOutputStream): Unit = // ...
@throws(classOf[IOException])
private def readObject(in: ObjectInputStream): Unit = // ...
回答2:
As already stated, you can define your own writeObject and readObject methods.
@throws(classOf[java.io.IOException])
private def writeObject(out : java.io.ObjectOutputStream) : Unit = /* your definition here */
However be careful when performing this on nested classes, objects or traits.
@serializable class Foo(x : Int) { @serializable object X { def y = x } }
If I serialize object X, it will actually serialize the containing Foo class, so this must also be serializable. This can be a PITA to deal with in custom serialization methods, so here's fair warning.
Another pain-point can be closure serialization. Try to keep a mental model of what variables are being captured in serialized closures. Ensure that these variables are something you'd want sent over IO!
来源：https://stackoverflow.com/questions/3443324/can-you-override-the-stream-writers-in-scala-serializable-objects