Java编写简单的UDP网络程序

public class UdpRecv
{
    /** Socket接收消息（先启动接收端）
     * <功能详细描述>
     * @param args
     * @throws Exception 
     * @see [类、类#方法、类#成员]
     */
    public static void main(String[] args)
        throws Exception
    {
//端口号要是发送方对应的端口号
        DatagramSocket ds = new DatagramSocket(8866);
        byte[] b = new byte[1024];
        DatagramPacket dp = new DatagramPacket(b, 1024);
        ds.receive(dp);
        String strRecv =
            new String(dp.getData(), 0, dp.getLength()) + " from " + dp.getAddress().getHostAddress() + ":" + " :"
                + dp.getPort();
        System.out.println(strRecv);
        ds.close();
    }
}

public class UdpSend
{
    /** Socket发送消息
     * <功能详细描述>
     * @param args
     * @throws Exception 
     * @see [类、类#方法、类#成员]
     */
    public static void main(String[] args)
        throws Exception
    {
        DatagramSocket ds = new DatagramSocket();
        String str = "你好";
//IP可以填写自己本地IP，端口号填写没有被程序占用的
        DatagramPacket dp =
            new DatagramPacket(str.getBytes(), str.getBytes().length, InetAddress.getByName("10.168.8.255"), 8866);
        ds.send(dp);
        ds.close();
    }
}