解決方法有兩個,第一種方法是最開始自己的處理,使用writeObject和readObject來實現自定義序列化,這個有些
繁雜,需要對每個實例字段進行序列化,不然,當你反序列化時,得到的對象的字段都是默認值,如int=0,string=null.
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... ...
,後來在網上找找,發現只需要將該內部類聲明為static,即可.這是因為內部非靜態類會存在一個隱含的到外部
類的引用(外部類.this),所以當序類化內部類時,會關聯序列化外部類,恰恰外部類沒有實現Serializable接口,就會
出現這個錯誤.下面是改過後的.
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好了,上面只是題外話.
我們在規劃序列化對象時,一般要考慮序列化的性能,所以對象不能太大,層次也不能太多.從這方面來考慮,
可以選擇序列化完整的一個類,或是只是針對字段來進行序列化.若是用于分布式中數據的傳輸,那應該是後
一種最好了.
下面來看第一種方法的一個例子
序列化對象
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public void receive(Message arg0) {
byte[] buf = arg0.getRawBuffer();
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.getOffset(), arg0.getLength());
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}
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首先定義了一個公共的序列化接口
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就是這麼多了.
寫到這裡,突然想到,是否java默認的序列化,也就是只將實例字段進行序列化,類結構等等應該不會也序列化的.
那麼這樣,上面兩種方法實際上區別不大(第一種是我這種懶惰的人比較喜歡的,^_^).
不過默認的序列化,即使只將實例字段進行序列化,應該也要帶上字段的名稱等信息吧,這樣的話,序列後的字節數應該還是比第二種多.
補充
看了一下jdk關于ObjectOutputStream中的注釋,了解到,默認的序列化,也沒有將整個類的代碼都序列化,而是序列
化可變的數據等等,下面是jdk的一部份內容:
对象的默认序列化机制写入的内容是:对象的类,类签名,以及非瞬态和非静态字段的值。其他对象的引用(瞬态和静态字段除外)也会导致写入那些对象。可使用引用共享机制对单个对象的多个引用进行编码,这样即可将对象的图形还原为最初写入它们时的形状。
writeObject 方法负责写入特定类的对象状态,以便相应的 readObject 方法可以还原它。该方法本身不必与属于对象的超类或子类的状态有关。状态是通过使用 writeObject 方法或使用 DataOutput 支持的用于基本数据类型的方法将各个字段写入 ObjectOutputStream 来保存的。
基本数据(不包括 serializable 字段和 externalizable 数据)以块数据记录的形式写入 ObjectOutputStream 中。块数据记录由头部和数据组成。块数据部分包括标记和跟在部分后面的字节数。连续的基本写入数据被合并在一个块数据记录中。块数据记录的分块因子为 1024 字节。每个块数据记录都将填满 1024 字节,或者在终止块数据模式时被写入。调用 ObjectOutputStream 方法 writeObject、defaultWriteObject 和 writeFields 最初只是终止所有现有块数据记录。