求助：一个java中的序列化机制

weicai_chen 2007-03-09 10:53:49

在java中，一个父类（SpuerC）没有实现serivalizable接口，它的子类（SubC）怎么样才能序列化？

我的程序如下，运行时产生如下错误：

java.io.NotSerializableException: InherSerialTest2.SubC
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at InherSerialTest2.InherSerialTest2.main(InherSerialTest2.java:21)

怎么样才能让SubC能序列化？

程序源码如下：

SuperC 类：

package InherSerialTest2;

public abstract class SuperC {

int supervalue;

public SuperC(int supervalue) {
super();
// TODO Auto-generated constructor stub
this.supervalue = supervalue;
}

public SuperC(){//必须要有无参构造函数

}

public int getSupervalue() {
return supervalue;
}

public void setSupervalue(int supervalue) {
this.supervalue = supervalue;
}

public String toString() {
// TODO Auto-generated method stub
return "supervalue : " + supervalue;
}

}

SubC 类

package InherSerialTest2;

import java.io.IOException;
import java.io.ObjectInputStream;

import InherSerialTest.SuperA;

public class SubC extends SuperC {

private int subvalue;

public SubC(int supervalue, int subvalue) {
super(supervalue);
// TODO Auto-generated constructor stub
this.subvalue = subvalue;
}

public int getSubvalue() {
return subvalue;
}

public void setSubvalue(int subvalue) {
this.subvalue = subvalue;
}

public String toString() {
// TODO Auto-generated method stub
return super.toString() + " ,subvalue :" + subvalue;
}

private void writeObject(java.io.ObjectOutputStream oos)throws IOException{

//先序列化对象
oos.defaultWriteObject();
//在序列化父类的域
oos.writeInt(supervalue);
}

private void readObject(ObjectInputStream ois)throws IOException, ClassNotFoundException{

//先反序列化对象
ois.defaultReadObject();
//再反序列化父类的域
supervalue = ois.readInt();
}
}

测试程序：

package InherSerialTest2;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class InherSerialTest2 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub

SubC sub = new SubC(100, 500);

try{
ObjectOutputStream oos = new ObjectOutputStream(
new FileOutputStream("c:\\InherSerialTest2.txt"));
oos.writeObject(sub);
oos.close();

ObjectInputStream ois = new ObjectInputStream(
new FileInputStream("c:\\InherSerialTest2.txt"));
SubC sub2 = (SubC) ois.readObject();
System.out.println(sub2);
ois.close();
}catch(Exception e){
e.printStackTrace();
}
}

}

多谢了！

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