Java UDP协议传对象

 首先所传对象必须是可序列化的

public class Data implements Serializable {

}

发送对象

   DatagramSocket socket = new DatagramSocket();

   //DatagramPacket(byte[] buf, int length, int length, InetAddress address, int port)

   DatagramPacket packet = new DatagramPacket(new byte[0], 0, InetAddress.getByName("127.0.0.1"), 1688);

   Data data = new Data();

   //对象->对象流->字节数组流->字节数组

   ByteArrayOutputStream byteArrayStream = new ByteArrayOutputStream();

   ObjectOutputStream objectStream = new ObjectOutputStream(byteArrayStream);

   objectStream.writeObject(data);

   byte[] arr = byteArrayStream.toByteArray();

   packet.setData(arr);//填充DatagramPacket

   socket.send(packet);//发送

   objectStream.close();

   byteArrayStream.close();

接收对象

   DatagramSocket socket = new DatagramSocket(1688);//监听端口号，1688

   byte[] buff = new byte[1024];

   DatagramPacket packet = new DatagramPacket(buff, buff.length);

   socket.receive(packet);

   ByteArrayInputStream byteArrayStram = new ByteArrayInputStream(buff);

   ObjectInputStream objectStream = new ObjectInputStream(byteArrayStram);

   Data data = (Data) objectStream.readObject();

   objectStream.close();

   byteArrayStram.close();