java实现基于UDP协议的聊天小程序操作

package com.offcn.second;
 
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.Scanner;
 
public class MyQQ {
    public static void main(String[] args) throws Exception{
        DatagramSocket ds = new DatagramSocket();
        Scanner sc= new Scanner(System.in);
        while(true){
            //发送消息
            System.out.print("My:");
            //输入发送信息
            String smsg = sc.nextLine();
            //byte[] sbs = smsg.getBytes();
            //int slen = sbs.length;
            //创建数据包
            DatagramPacket sdp = new DatagramPacket(smsg.getBytes(),//数据转为byte数组
                    smsg.getBytes().length,//数据长度
                    InetAddress.getLocalHost(),//接收端端口号
                    9999);//接收端，端口号
            //发送
            ds.send(sdp);
            //接收消息
            //创建接收数据的数据包
            DatagramPacket rdp = new DatagramPacket(new byte[1024],1024);
            //接收数据
            ds.receive(rdp);
            //将接收的数据转为字符串
            String rmsg = new String(rdp.getData(),0,rdp.getLength());
            //打印输出
            System.out.println("His:"+rmsg);
 
 
 
        }
    }
}

package com.offcn.second;
 
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.util.Scanner;
 
public class HisQQ {
    public static void main(String[] args) throws Exception{
        DatagramSocket ds = new DatagramSocket(9999);
        Scanner sc = new Scanner(System.in);
        while(true){
            //创建接收数据的数据包
            DatagramPacket rdp = new DatagramPacket(new byte[1024],1024);
            ds.receive(rdp);
            //将接收的数据转换为字符串
            String rmsg = new String(rdp.getData(),0,rdp.getLength());
            //输出接收到的信息
            System.out.println("His:"+rmsg);
 
 
            //给对方回消息
            //输入发送的数据
            System.out.print("My:");
            String smsg = sc.nextLine();
            //创建发送数据的数据包
            DatagramPacket sdp = new DatagramPacket(smsg.getBytes(),
                    smsg.getBytes().length,
                    rdp.getAddress(),
                    rdp.getPort());
            ds.send(sdp);
        }
    }
}