用java写一个简易的本地聊天室

发送端

import java.io.IOException;
import java.net.*;
import java.util.Scanner;

public class send {
    public static void main(String[] args) throws IOException {

        //1.创建对象datagramSocket的对象
        DatagramSocket ds = new DatagramSocket();

        //2.打包数据
        Scanner sc = new Scanner(System.in);
        while(true){
            System.out.println("输入");
            String str = sc.nextLine();
            if("exit".equals(str)){
                break;
            }
            byte[] bytes = str.getBytes("UTF-8");

            InetAddress address = InetAddress.getByName("192.168.122.18");

            int port = 10086;

            DatagramPacket dp = new DatagramPacket(bytes,bytes.length,address,port);

            //发送数据
            ds.send(dp);
        }
            //释放资源
            ds.close();


    }
}

接受端

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class receive {
    public static void main(String[] args) throws IOException {
        //1.创建对象DatagramSocket的对象
        DatagramSocket ds = new DatagramSocket(10086);

        //2.接受数据包
        byte[] bytes = new byte[1024];
        DatagramPacket dp = new DatagramPacket(bytes,bytes.length);

        while(true){
            ds.receive(dp);

        //3，解析数据包
        byte[] data = dp.getData();
        int len = dp.getLength();
        String ip = dp.getAddress().getHostName();
        String name = dp.getAddress().getHostName();

        //4.打印数据
            System.out.println("ip为:"+ip+",主机名为"+name+",的人，发送了数据:"+new String(data,0,len));

        }


    }
}

演示效果，虚拟机和宿主机相互连接

最终效果