网络编程中使用多线程进行相互聊天

使用网络编程.通信协议.UDP案例聊天

1.建立一个发送方

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.SocketException;
import java.nio.charset.StandardCharsets;

public class TalkSend implements Runnable{

    DatagramSocket socket=null;
    BufferedReader reader=null;
    //写一个对方的信息
    private int formPort;
    private String toIP;
    private int toPort;

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

    @Override
    public void run() {//负责发送信息
        while (true){
            String data= null;//读取一行
            try {
                data = reader.readLine();
                byte[] datas = data.getBytes(StandardCharsets.UTF_8);
                DatagramPacket packet = new DatagramPacket(datas, 0, datas.length,new InetSocketAddress(this.toIP,this.toPort));
                socket.send(packet);
                if (data.equals("bye")){
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        socket.close();
    }

}

2.建立一个接收方

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

public class TalkReceive implements Runnable{

    DatagramSocket socket=null;
    private int port;
    private String msgForm;

    public TalkReceive(int port,String msgForm) {
        this.port = port;
        this.msgForm=msgForm;
        try {
            socket = new DatagramSocket(port);
        } catch (SocketException e) {
            e.printStackTrace();
        }

    }

    @Override
    public void run() {
        while (true){
            try {
                //准备接收包裹
                byte[] container = new byte[1024];

                DatagramPacket packet = new DatagramPacket(container,0,container.length);

                //3.阻塞式接收包裹
                socket.receive(packet);

                //接收数据
                byte[] data = packet.getData();
                //接收的数据
                String receiveData = new String(data, 0, data.length);
                //输出读取的是什么
                System.out.println(msgForm+":"+receiveData);
                //当我们输入bye就进行断开连接
                if (receiveData.equals("bye")){
                    break;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        //关闭
        socket.close();
    }


}

3.写我们的主线程，建立一个老师和学生的对话 这步属实是太简单了
3.1 学生端：

public class TalkStudent {
    public static void main(String[] args) {
        //开启两个线程
        new Thread(new TalkSend(7777,"localhost",9999)).start();
        new Thread(new TalkReceive(8888,"老师说")).start();
    }
}

3.2老师端

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