java实现多人聊天

• 一、接受者类？
• 二、发送者类
• 三、学生用户
• 四、老师用户
• 五、运行结果

package com.xxx.chat;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
public class UdpReciver implements Runnable{
    DatagramSocket socket=null;
    private int port;
    private String msgFrom;
    public UdpReciver(int port,String msgFrom) throws SocketException {
        this.port = port;
        this.msgFrom=msgFrom;
        socket=new DatagramSocket(port);
    }
    @Override
    public void run() {
        while(true){
            byte[] buffer=new byte[1024];
            DatagramPacket datagramPacket=new DatagramPacket(buffer,0,buffer.length);
            try {
                socket.receive(datagramPacket);//接受包裹
            } catch (IOException e) {
                e.printStackTrace();
            }
            byte[] data = datagramPacket.getData();
            String  receiveDate=new String(data,0,data.length);
            System.out.println(msgFrom+":"+receiveDate);
            if(receiveDate.equals("bye")){
                break;
            }
        }
        socket.close();
    }
}

package com.xxx.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;
import java.net.Socket;

public class UdpSenders implements Runnable{
    String data = null;
    DatagramSocket socket=null;
    DatagramPacket packet=null;
    BufferedReader reader=null;
    private int fromPort;
    private int toPort;
    private String topIp;

    public UdpSenders(int fromPort, int toPort, String topIp) {
        this.fromPort = fromPort;
        this.toPort = toPort;
        this.topIp = topIp;
        try {
            reader = new BufferedReader(new InputStreamReader(System.in));
            socket = new DatagramSocket(fromPort);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {
        while(true){
            try {
                data = reader.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            byte[] buffer=data.getBytes();
            InetSocketAddress inetSocketAddress=new InetSocketAddress(this.topIp,this.toPort);
            packet=new DatagramPacket(buffer,0,buffer.length,inetSocketAddress);
            try {
                socket.send(packet);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if(data.equals("bye")){
                break;
            }
        }
        socket.close();
    }
}

package com.xxx.chat;

import java.net.SocketException;

public class TalkStudent {
    public static void main(String[] args) {
        //开启两个线程
        new Thread(new UdpSenders(777,9999,"localhost")).start();
        try {
            new Thread(new UdpReciver(8888,"老师")).start();
        } catch (SocketException e) {
            e.printStackTrace();
        }
    }
}

package com.xxx.chat;

import java.net.SocketException;

public class TalkTeacher {
    public static void main(String[] args) throws SocketException {
        new Thread(new UdpSenders(5555,8888,"localhost")).start();
        new Thread(new UdpReciver(9999,"学生")).start();
    }
}