10.UDP实现聊天

循环发送消息：

package com.Inet.chat;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;

public class UdpSenderDemo01 {
    public static void main(String[] args) throws IOException {
        DatagramSocket socket = new DatagramSocket(8888);

        //准备数据：控制台读取 System.in

        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        while (true) {
            String data = reader.readLine();
            byte[] datas = data.getBytes();
            DatagramPacket packet = new DatagramPacket(datas, 0, data.length(), new InetSocketAddress("localhost", 6666));

            socket.send(packet);
            if (data.equals("bye")) {
                break;
            }
        }
        socket.close();
    }
}

循环接收消息：

package com.Inet.chat;

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

public class UdpReceiveDemo01 {
    public static void main(String[] args) throws Exception {
        DatagramSocket socket = new DatagramSocket(6666);

        while (true) {

            //准备接收包裹
            byte[] container = new byte[1024];
            DatagramPacket packet = new DatagramPacket(container, 0, container.length);
            socket.receive(packet);

            //断开连接
            byte[] data = packet.getData();
            String receiveData = new String(data, 0, data.length);

            System.out.println(receiveData);

            if (receiveData.equals("bye")) {
                break;
            }
        }
        socket.close();
    }
}

//开启接收端，再开启发送端，结果：
发送端发送消息，接收端接收对应的消息