public interface Serializable {
}

该接口没有任何实现方法,是一种标志,instance of  Serializable 会判断object类型

一、序列化和反序列化的概念

  把对象转换为字节序列的过程称为对象的序列化
  把字节序列恢复为对象的过程称为对象的反序列化
  对象的序列化主要有两种用途:
  1) 把对象的字节序列永久地保存到硬盘上,通常存放在一个文件中;
  2) 在网络上传送对象的字节序列。

二、JDK类库中的序列化API

  java.io.ObjectOutputStream代表对象输出流,它的writeObject(Object obj)方法可对参数指定的obj对象进行序列化,把得到的字节序列写到一个目标输出流中。
  java.io.ObjectInputStream代表对象输入流,它的readObject()方法从一个源输入流中读取字节序列,再把它们反序列化为一个对象,并将其返回。
  只有实现了Serializable和Externalizable接口的类的对象才能被序列化。Externalizable接口继承自 Serializable接口,实现Externalizable接口的类完全由自身来控制序列化的行为,而仅实现Serializable接口的类可以 采用默认的序列化方式 。
  对象序列化包括如下步骤
  1) 创建一个对象输出流,它可以包装一个其他类型的目标输出流,如文件输出流;
  2) 通过对象输出流的writeObject()方法写对象。

  对象反序列化的步骤如下
  1) 创建一个对象输入流,它可以包装一个其他类型的源输入流,如文件输入流;
  2) 通过对象输入流的readObject()方法读取对象。

三、serialVersionUID的作用

s​e​r​i​a​l​V​e​r​s​i​o​n​U​I​D​:​ ​字​面​意​思​上​是​序​列​化​的​版​本​号​,凡是实现Serializable接口的类都有一个表示序列化版本标识符的静态变量

1 private static final long serialVersionUID

  实现Serializable接口的类如果类中没有添加serialVersionUID,那么就会出现如下的警告提示

  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" alt="" />

 serialVersionUID有两种生成方式:

  采用aaarticlea/png;base64,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" alt="" />这种方式生成的serialVersionUID是1L,例如:

1 private static final long serialVersionUID = 1L;

  采用aaarticlea/png;base64,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" alt="" />这种方式生成的serialVersionUID是根据类名,接口名,方法和属性等来生成的,例如:

1 private static final long serialVersionUID = 4603642343377807741L;

四、serialVersionUID的取值

  serialVersionUID的取值是Java运行时环境根据类的内部细节自动生成的。如果对类的源代码作了修改,再重新编译,新生成的类文件的serialVersionUID的取值有可能也会发生变化。
  类的serialVersionUID的默认值完全依赖于Java编译器的实现,对于同一个类,用不同的Java编译器编译,有可能会导致不同的 serialVersionUID,也有可能相同。为了提高serialVersionUID的独立性和确定性,强烈建议在一个可序列化类中显示的定义serialVersionUID,为它赋予明确的值

  显式地定义serialVersionUID有两种用途:
    1、 在某些场合,希望类的不同版本对序列化兼容,因此需要确保类的不同版本具有相同的serialVersionUID;
    2、 在某些场合,不希望类的不同版本对序列化兼容,因此需要确保类的不同版本具有不同的serialVersionUID。

五、什么情况下需要序列化

当你想把的内存中的对象状态保存到一个文件中或者数据库中时候;
当你想用套接字在网络上传送对象的时候;
当你想通过RMI传输对象的时候;

(老实说,上面的几种,我可能就用过个存数据库的)

六、如何实现序列化

作用。为啥要实现这个 Serializable 接口,也就是为啥要序列化

七、serialVersionUID 这个的值到底是在怎么设置的,有什么用。有的是1L,有的是一长串数字,迷惑ing。

  解决办法:在 JavaBean 对象中增加一个 serialVersionUID 字段,用来固定这个版本,无论我们怎么修改,版本都是一致的,就能进行反序列化了

八、 How---怎么实现序列化:

  只有实现了 Serializable 或 Externalizable 接口的类的对象才能被序列化,否则抛出异常。
对于实现了这两个接口,具体序列化和反序列化的过程又分以下3中情况:
  情况1:若类仅仅实现了Serializable接口,则可以按照以下方式进行序列化和反序列化
ObjectOutputStream采用默认的序列化方式,对对象的非transient的实例变量进行序列化。
ObjcetInputStream采用默认的反序列化方式,对对象的非transient的实例变量进行反序列化。

  情况2:若类不仅实现了Serializable接口,并且还定义了readObject(ObjectInputStream in)和writeObject(ObjectOutputSteam out),则采用以下方式进行序列化与反序列化。
ObjectOutputStream调用对象的writeObject(ObjectOutputStream out)的方法进行序列化。
ObjectInputStream会调用对象的readObject(ObjectInputStream in)的方法进行反序列化。

  情况3:若类实现了Externalnalizable接口,且类必须实现readExternal(ObjectInput in)和writeExternal(ObjectOutput out)方法,则按照以下方式进行序列化与反序列化。
ObjectOutputStream调用对象的writeExternal(ObjectOutput out))的方法进行序列化。
ObjectInputStream会调用对象的readExternal(ObjectInput in)的方法进行反序列化。

参考文章:

1、 Java基础学习总结——Java对象的序列化和反序列化 (孤傲苍狼

2、 java序列化反序列化深入探究

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