当我遇到保存不可序列化并且在要序列化的类(实例变量)中引用的对象的状态时,我正在研究 Java 中的序列化。在下面的代码中,我有类 Dog (Serializable),它引用了类 Collar(not serializable); 它又引用了 Color 类(不可序列化)。尽管尝试了所有可能性,但我遇到了错误。这是我想出的最新代码:
class Color {
private String colorName;
public String getColorName() {
return colorName;
}
public void setColorName(String colorName) {
this.colorName = colorName;
}
Color(String color) {
this.colorName = color;
}
}
class Collar {
private Color color;
private int size;
public int getSize() {
return size;
}
public void setSize(int size) {
this.size = size;
}
public Color getColor() {
return color;
}
public void setColor(Color color) {
this.color = color;
}
Collar(int size, Color color) {
this.size = size;
this.color = color;
}
}
class Dog implements Serializable {
Dog(String breed, Collar collar) {
this.breed = breed;
this.collar = collar;
}
private String breed;
public String getBreed() {
return breed;
}
public void setBreed(String breed) {
this.breed = breed;
}
public Collar getCollar() {
return collar;
}
public void setCollar(Collar collar) {
this.collar = collar;
}
transient private Collar collar;
private void writeObject(ObjectOutputStream os) {
try {
os.defaultWriteObject();
os.writeInt(this.getCollar().getSize());
os.writeUTF(this.getCollar().getColor().getColorName());
os.close();
} catch (IOException ex) {
Logger.getLogger(Dog.class.getName()).log(Level.SEVERE, null, ex);
}
}
private void readObject(ObjectInputStream is) {
try {
is.defaultReadObject();
int size = is.readInt();
String colorName = is.readUTF();
this.setCollar(new Collar(size, new Color(colorName)));
is.close();
} catch (Exception ex) {
Logger.getLogger(Dog.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
public class App0001 {
public static void main(String[] args) {
try {
Dog d = new Dog("Great Dane", new Collar(3, new Color("RED")));
//System.out.println(d.getCollar().getColor().getColorName());
ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream("obj.ser"));
os.writeObject(d);
os.close();
ObjectInputStream is = new ObjectInputStream(new FileInputStream("obj.ser"));
d = (Dog) is.readObject();
System.out.println(d.getCollar().getColor().getColorName());
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
我收到以下错误:
java.io.IOException: Write error
at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:260)
at java.io.ObjectOutputStream$BlockDataOutputStream.drain(ObjectOutputStream.java:1847)
at java.io.ObjectOutputStream$BlockDataOutputStream.setBlockDataMode(ObjectOutputStream.java:1756)
at java.io.ObjectOutputStream.writeNonProxyDesc(ObjectOutputStream.java:1257)
at java.io.ObjectOutputStream.writeClassDesc(ObjectOutputStream.java:1211)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1395)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
at java.io.ObjectOutputStream.writeFatalException(ObjectOutputStream.java:1547)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:333)
at Serialization.App0001.main(App0001.java:121)
这不是生产代码。这只是为了练习和理解。