java.io.StreamCorruptedException：無效類型代碼：3F當我自定義序列化過程

Question

請幫助理解序列化問題的原因。

我有以下目標類聲明：

class Line implements Serializable { 
    int index; 

    public Line() { 
     System.out.println("Constructing empty line"); 
    } 

    Line(int index) { 
     System.out.println("Constructing line: " + index); 
     this.index = index; 
    } 

    //get and set 

    public void printInfo() { 
     System.out.println("Line: " + index); 
     System.out.println(" Object reference: " + super.toString());   
    } 
} 

和主要有以下：

  ... 

      FileOutputStream os = new FileOutputStream(fileName); 
      ObjectOutputStream oos = new ObjectOutputStream(os); 
      oos.writeObject(line1); 
      oos.close(); 
      System.out.println("Read objects:"); 
      FileInputStream is = new FileInputStream(fileName); 
      ObjectInputStream ois = new ObjectInputStream(is); 

      Line line = (Line) ois.readObject(); 
      line.printInfo(); 

      ois.close(); 
      ... 

此代碼的工作不錯，但如果我添加到目標類以下方法：

private void writeObject(ObjectOutputStream oos) throws IOException { 
     // default serialization 
     System.out.println("custom serialization!!!!"); 
     oos.defaultWriteObject(); 
    } 

    private void readObject(ObjectInputStream objectInputStream) throws 
      IOException, ClassNotFoundException { 
     System.out.println("custom Deserialization!!!!"); 
     objectInputStream.readObject(); 
    } 

我看到：

java.io.StreamCorruptedException: invalid type code: 00 
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1355) 
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350) 
    at io_nio.Line.readObject(SerializationWithReferencesToComplicatedObjects.java:164) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    ... 

問題的原因是什麼？

Answer 1

您應該在readObject()方法中調用ObjectInputStream.defaultReadObject()。不是ObjectInputStream.readObject()。