對象轉爲字節數組

public static byte[] convertToByteArray(Object obj) throws IOException {
        ObjectOutputStream os = null;
        ByteArrayOutputStream byteStream = new ByteArrayOutputStream(5000);
        os = new ObjectOutputStream(new BufferedOutputStream(byteStream));
        os.flush();
        os.writeObject(obj);
        os.flush();
        byte[] sendBuf = byteStream.toByteArray();
        os.close();
        return sendBuf;
    }

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