[英]Extract java superclass from serializable object with backwards compatibility
我想将类功能移到父类,但这会阻止反序列化。 起点是这样的:
package xso.test.serializable;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
public class WriteClass
{
public static void main( String[] args ) throws Exception
{
MyClass d = new MyClass();
d.i = 888;
try (ObjectOutputStream oos = new ObjectOutputStream( new FileOutputStream( "MyClass.ser" ) ))
{
System.out.println( "Serializing" );
oos.writeObject( d );
}
}
}
class MyClass implements Serializable
{
/**
* same serialVersionID as in ReadClassNew
*/
private static final long serialVersionUID = -4436695035358861227L;
int i = 10;
}
我想像这样将MyClass提取到新的SuperClass(MyNewParentClass):
package xso.test.serializable;
import java.io.FileInputStream;
import java.io.ObjectInputStream;
import java.io.Serializable;
public class ReadClassNew
{
public static void main( String[] args ) throws Exception
{
ObjectInputStream ois = new ObjectInputStream( new FileInputStream( "MyClass.ser" ) );
System.out.println( "Deserializing" );
MyClass clazz = (MyClass)ois.readObject();
System.out.println( clazz.i );
}
}
class MyNewParentClass implements Serializable
{
/**
*
*/
private static final long serialVersionUID = -6437613570659781444L;
int i = 10;
}
class MyClass extends MyNewParentClass
{
/**
* same serialVersionID as in WriteClass
*/
private static final long serialVersionUID = -4436695035358861227L;
//int i = 10; // moved to parent class. (Field will not serialized any more sadly )
}
要查看并重现该问题:
运行第二个代码段。 控制台输出将是:
Deserializing 0
如果您取消注释int i = 10;
在子类(MyClass)中,您可以看到反序列化可以正常工作。 不过,我想反序列化领域的int i
的超类。
这可能吗? 感谢您的任何建议。
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