在swing下完成恢复撤销功能（非文本）的实现遇到的一个问题

[xuezhishang5455]

[size=12px]我需要实现一个完成恢复撤销功能的通用模块，这个项目主要是是基于swing下的图面界面开发，也就是回到上一步以及到下一步。我的思路是将当前的panel面板当做一个对象对其进行深拷贝
public static Object copy(Object oldObj) {
Object obj = null;
try {
// Write the object out to a byte array
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(bos);
out.writeObject(oldObj);
out.flush();
out.close();

// Retrieve an input stream from the byte array and read
// a copy of the object back in.
ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
ObjectInputStream in = new ObjectInputStream(bis);
obj = in.readObject();
} catch (IOException e) {
e.printStackTrace();
} catch (ClassNotFoundException cnfe) {
cnfe.printStackTrace();
}
return obj;
}
然后将拷贝的对象放在一个队列之中，恢复时取出来即可，然后发现了一个bug
java.io.IOException: failed to load image contents
at javax.swing.ImageIcon.writeObject(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeArray(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.access$300(Unknown Source)

注：这个面板继承了JPanel，里面还包含其他的组件，例如图例框，比例尺等，还实现了paintComponent方法