java,UDP协议简单实现

//UDP协议简单实现-----Server
package UDP;

import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;


public class UdpServer implements Runnable {
    private int port;

    public UdpServer(int port) {
        this.port = port;
    }

    public void run() {
        try {
            // listening at port for udp request
            DatagramSocket server = new DatagramSocket(new InetSocketAddress(port));
            byte[] bs = new byte[4];
            ByteBuffer bbuf = null;
            DatagramPacket data = new DatagramPacket(bs, bs.length);
            server.setSoTimeout(1000 * 10); // set timeout
            while (true) { // 一直监听
                server.receive(data);
                bbuf = ByteBuffer.wrap(bs, 0, 4);
                String s = "receive " + data.getData().length + " byte data,value: " + bbuf.getInt();
                System.out.println(s);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        new Thread(new UdpServer(11111)).start();
    }
}

//客户端实现;

package UDP;

    import java.net.DatagramPacket;
    import java.net.DatagramSocket;
    import java.net.InetSocketAddress;


    public class UdpClient implements Runnable {
        private int port;

        public UdpClient(int port) {
            this.port = port;
        }

        public void run() {
            try {
                DatagramSocket client = new DatagramSocket();
                byte[] bs = new byte[4];
                InetSocketAddress isa = new InetSocketAddress("localhost", port);
                DatagramPacket data = new DatagramPacket(bs, bs.length);
                data.setSocketAddress(isa);
                for (int i = 0; i < 10; i++) {
                    data.setData(int2bytes(i));
                    client.send(data);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        static byte[] int2bytes(int num) {
            byte[] b = new byte[4];
            for (int i = 0; i < 4; i++) {
                b[i] = (byte) (num >>> (24 - i * 8));
            }
            return b;
        }
    }

//测试代码;

package UDP;

public class Test {
    public static void main(String[] args) throws InterruptedException {
        int port = 11111;
        try{
            new Thread(new UdpServer(port)).start();
            new Thread(new UdpClient(port)).start();
        }catch(Exception e){
            //e.printStackTrace();
        }
    }
}