将Integer集合序列化为字节数组，然后反序列化

Question

I need to have serialization and deserialization of Collection<Integer> for storing it in Redis which requires byte[] . I've found a code using ByteBuffer and IntBuffer for serialization:

byte[] serializeIntegerCollection(Collection<Integer> collection) {
    ByteBuffer byteBuffer = ByteBuffer.allocate(collection.size() * 4);
    IntBuffer intBuffer = byteBuffer.asIntBuffer();
    collection.forEach(intBuffer::put);
    return byteBuffer.array();
}

And now the code I try to use for deserialization:

Collection<Integer> deserializeIntegerCollection(byte[] bytes) {
    ByteBuffer byteBuffer = ByteBuffer.wrap(bytes);
    IntBuffer intBuffer = byteBuffer.asIntBuffer();
    return asList(intBuffer.array());
}

But intBuffer.array() throws UnsupportedOperationException . What's wrong with it and how to handle the issue?

Answer 1

you can serialize it like. serializeIntegerCollection class must implements serializable .

---

ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
oos.writeObject(list);
byte[] bytes = bos.toByteArray();

you can deserialize it like. deserializeIntegerCollectionclass

ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(bytes)); @SuppressWarnings("unchecked") Collection<Integer> collection= (Collection<Integer>) ois.readObject();