package netProgram;

import java.io.ByteArrayInputStream;

import java.io.ObjectInputStream;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

/**

 * 接收端 1.使用DatagramSocket 指定端口 创建接收端 2.准备容器 封装成DatagramPacket 3.阻塞式接收 packet

 * receive(DatagramPacket packet) 4.分析数据 byte[] getData() 5.释放资源

 */

public class UDPTest {

    public static void main(String[] args) throws Exception {

        DatagramSocket server = new DatagramSocket(9999);

        byte[] container = new byte[64 * 1024];

        DatagramPacket packet = new DatagramPacket(container, 0, container.length);

        server.receive(packet);

        byte[] data = packet.getData();

        ByteArrayInputStream stream = new ByteArrayInputStream(data, 0, data.length);

        ObjectInputStream ois = new ObjectInputStream(stream);

        Person temp = (Person) ois.readObject();

        System.out.println(temp.getAge() + "--->" + temp.getName());

        server.close();

    }

}

package netProgram;

import java.io.ByteArrayOutputStream;

import java.io.ObjectOutputStream;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.InetSocketAddress;

/**

 * 发送端

 * 1.使用DatagramSocket 指定端口 创建发送端

 * 2.准备数据  准成字节数组

 * 3.封装成 DatagramPacket,需要指定目的地

 * 4.发送包裹  send(DatagramPacket packet)

 * 5.释放资源

 * */

public class UDPTest2 {

    public static void main(String[] args) throws Exception {

        DatagramSocket client = new DatagramSocket(8888);//自身的端口号

        //String data = "hello udp program!";

        ByteArrayOutputStream stream = new ByteArrayOutputStream();

        ObjectOutputStream oos = new ObjectOutputStream(stream);

        oos.writeObject(new Person(15, "john"));

        //byte[] datas = data.getBytes();

        byte[] datas = stream.toByteArray();

        //指定发往的目的地

        DatagramPacket packet = new DatagramPacket

                (datas, 0, datas.length,

                        new InetSocketAddress("localhost", 9999));

        client.send(packet);

        client.close();

    }

}