Java 使用udp协议发送数据

最近工作中用到使用udp和服务端通信，所以记录下….

//客户端public static void send(byte[] data,String ip,int port) throws Exception{        DatagramSocket s = new DatagramSocket(null);        s.setReuseAddress(true);        //这里是指定发送的客户端端口，因为该协议规定只接收由此端口发出的数据        s.bind(new InetSocketAddress(9001));        DatagramPacket p = new DatagramPacket(data,0,data.length, new InetSocketAddress(ip, port));        s.send(p);    }

//服务端public class SocketUdp {    final private static String TAG = "SocketUdp: ";    public static void main(String args[]) {        DatagramSocket socket = null;        DatagramPacket datapacket = null;        InetSocketAddress address = null;        try {            address = new InetSocketAddress(InetAddress.getLocalHost(), 9090);            socket = new DatagramSocket(address);            // socket.bind(address);            byte buf[] = new byte[1024];            datapacket = new DatagramPacket(buf, buf.length);            System.out.println("等待接收客户端数据．．．");            socket.receive(datapacket);            buf = datapacket.getData();            InetAddress addr = datapacket.getAddress();            int port = datapacket.getPort();            System.out.println("客户端发送的数据: " + new String(buf) );            System.out.println("数据来源 " + addr + ":" + port);            SocketAddress toAddress = datapacket.getSocketAddress();            String sendStr = "server return ok";            buf = sendStr.getBytes();            datapacket = new DatagramPacket(buf, buf.length);            datapacket.setSocketAddress(toAddress);            socket.send(datapacket);            System.out.println("发送结束");        } catch (UnknownHostException e) {            System.out.println(TAG + e.getMessage());            e.printStackTrace();        } catch (SocketException e) {            System.out.println(TAG + e.getMessage());            e.printStackTrace();        } catch (IOException e) {            System.out.println(TAG + e.getMessage());            e.printStackTrace();        }    }}