UDP聊天实现

循环发送

package com.shushu.net2;
​
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetSocketAddress;
import java.net.SocketException;
​
public class UdpSenderDemo01 {
    public static void main(String[] args) throws Exception {
​
        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,datas.length,new InetSocketAddress("localhost",6666));
​
            socket.send(packet);
            if (data.equals("bye"))
                break;
        }
​
​
        socket.close();
    }
}

 

循环接收

package com.shushu.net2;
​
​
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
​
public class UdpReceiveDemo01 {
    public static void main(String[] args) throws IOException {
        DatagramSocket socket = new DatagramSocket(6666);
​
        //准备接收包裹
​
        while (true){
            byte[] container = new byte[1024];
            DatagramPacket packet = new DatagramPacket(container,0,container.length);
            socket.receive(packet);//阻塞式接收包裹
            //断开连接，bye
            byte[] data = packet.getData();
            String receiveData = new String(data, 0, data.length);
            System.out.println(receiveData);
            if (receiveData.equals("bye"))
                break;
​
        }
​
        socket.close();
    }
​
}
​