可序列化如何在java中工作？ [英] how does serializable work in java?

问题描述

如果我有一个我存储在会话中的类的实例，我需要使它可序列化。这个类有一个静态变量，它会在每个存储的实例中被序列化吗？

If I have an instance of a class that I store in a session I need to make it serializable. This class has a static variable, will this be serialized in every instance stored?

静态变量是对包含后台大量数据的缓存的引用。所有这些数据都会被序列化吗？如果是这样，似乎最好使此变量成为瞬态，并在每次恢复实例时重新获取缓存实例。也许不会在类中存储缓存实例。

The static variable is a reference to a cache containing a lot of data in the background. Will all of this data be serialized? If so, it seems preferable to make this variable transient and re-fetch the cache instance each time the instance is restored. Maybe not store the cache instance at all in the class.

当一个类从序列化状态恢复时，构造函数是否会执行？如果没有，我可以使用其他方法来重新设置瞬态变量吗？

Will the constructor execute when a class is restored from a serialized state? if not is there any other method I can use to re-instate a transient variable?

推荐答案

这个类有一个静态变量，
这个在每个实例中被序列化
存储？

This class has a static variable, will this be serialized in every instance stored?

否。根据 Java Object Serialization Specificaiton ：类的默认可序列化字段被定义为非瞬态和非静态字段。

No. According to the Java Object Serialization Specificaiton: "Default serializable fields of a class are defined to be the non-transient and non-static fields."

请问构造函数从序列化状态恢复类时执行？

Will the constructor execute when a class is restored from a serialized state?

不。反序列化绕过构造函数（除非你有一个非可序列化的超类）。

No. Deserialization bypasses constructors (unless you have a non-serializable superclass).

如果没有，我可以使用任何其他方法来重新启动一个瞬态变量？

if not is there any other method I can use to re-instate a transient variable?

你可以使用 readObject（）方法，如 Serializable <中所述/ code> API doc。

You can use the readObject() method for that, as described in the Serializable API doc.

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