有关于java socket发送与接收的有关问题

for (int i = 0; i < 10; i++)        {            ping = new Ping();                                    sendMessage(InetAddress.getByName("localhost"), Integer.parseInt(port),                    ping);                }public void sendMessage(InetAddress receiveHost, int receivePort,            Ping message) throws IOException    {        try        {            ByteArrayOutputStream bout = new ByteArrayOutputStream();            ObjectOutputStream oout = new ObjectOutputStream(bout);            oout.writeObject(message); // 序列化对象            oout.flush();            byte[] sendBuff = bout.toByteArray(); // 转化为字节数组            DatagramPacket datagram = new DatagramPacket(sendBuff,                    sendBuff.length, receiveHost, receivePort);            DatagramSocket socket = new DatagramSocket();            socket.send(datagram); // 通过DatagramPacket发送对象        }        catch (Exception ex)        {            ex.printStackTrace();        }    }

Ping p = receiveMessage();public Ping receiveMessage() throws Exception    {        byte[] receiveBuff = new byte[1024];        DatagramPacket datagram = new DatagramPacket(receiveBuff, 1024);        DatagramSocket socket = new DatagramSocket(Integer.parseInt(port));        socket.receive(datagram);        Ping message = new Ping();        try        {            ByteArrayInputStream bint = new ByteArrayInputStream(receiveBuff);            ObjectInputStream oint = new ObjectInputStream(bint);            message = (Ping) oint.readObject(); // 反序列化，恢复对象        }        catch (Exception ex)        {            ex.printStackTrace();        }        return message;    }