UDP传输案例

/**
 * 发送方
 */
public class DataGramSender {

    public static void main(String[] args) {
        try {
            //9999向外发的端口号
            DatagramSocket socket = new DatagramSocket(9999);
            int i=1;
            while(true){
                String content="Tom"+i;
                byte[] buf=content.getBytes();
                //创建数据报表
                DatagramPacket packet = new DatagramPacket(buf, buf.length);
                //设置包要发送的地址和端口号
                packet.setAddress(InetAddress.getByName("localhost"));
                packet.setPort(8888);
                socket.send(packet);
                System.out.println("sent"+content);
                Thread.sleep(1000);
                i++;
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}


/**
 * 接收方
 *
 */
public class DataGramRece {
    public static void main(String[] args) {
        try {
            //创建数据报套接字
            DatagramSocket socket = new DatagramSocket(8888);
            byte[] buf=new byte[1024*64];
            DatagramPacket packet = new DatagramPacket(buf, buf.length);
            while(true){
                socket.receive(packet);
                //得到收到的数据长度
                int len=packet.getLength();
                System.out.println(new String(buf,0,len));
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}