java - 写入 ObjectOutputStream 并返回垃圾

Question

我将一些对象放入流中，然后从中取出字节数组，然后读回所有内容。前两条数据完好无损，然后我得到零，然后是 EOF 异常。为什么？

try {
     ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
     ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);
     objectOutputStream.writeObject("abcdef");
     objectOutputStream.writeInt(1);
     objectOutputStream.writeObject(new byte[]{1,2,3,4,5,6,7,8});
     objectOutputStream.writeInt(2);
     objectOutputStream.writeObject(new byte[]{11,12,13,14,15,16,17,18});
     objectOutputStream.close();


     byte[] original = byteArrayOutputStream.toByteArray();
     System.out.println(Arrays.toString(original));

     byte[] b=new byte[8];
     ObjectInputStream objectInputStream = new ObjectInputStream(new ByteArrayInputStream(original));
     String s= (String) objectInputStream.readObject(); // works fine
     objectInputStream.readInt(); // works fine

     objectInputStream.read(b); // why it reads zeroes instead of [1,2,3,4,5,6,7,8]?
     System.out.println(Arrays.toString(b));
     int length = objectInputStream.readInt(); // EOF unexpectedly reached, why?
     objectInputStream.read(b);
}
catch (IOException e) {
     e.printStackTrace();
} catch (ClassNotFoundException e) {
     e.printStackTrace();
}

异常(exception):

java.io.EOFException
at java.io.DataInputStream.readInt(DataInputStream.java:375)
at java.io.ObjectInputStream$BlockDataInputStream.readInt(ObjectInputStream.java:2775)
at java.io.ObjectInputStream.readInt(ObjectInputStream.java:949)

Answer 1

我怀疑第一个问题是您需要close() 您的objectOutputStream。查看ObjectOutputStream documentation例如。