java学习记录13-UDP实现聊天（多线程）_java udp 客户端如何多线程-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_42895898/article/details/123909747

这个博客展示了如何使用Java实现一个基于UDP的简单聊天应用。`TalkSend` 类用于发送数据，通过`DatagramSocket`创建并读取控制台输入。`TalkReceive` 类用于接收数据，不断监听特定端口直到接收到'bye'为止。在`TalkStudent` 和 `TalkTeacher` 类中分别创建了发送和接收线程，模拟学生和老师之间的通信。

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java学习记录

TalkSend.java:

public class TalkSend implements Runnable{
    DatagramSocket socket = null;
    BufferedReader reader = null;

    private int fromPort;
    private String toIP;
    private int toPort;

    public TalkSend(int fromPort, String toIP, int toPort) {
        this.fromPort = fromPort;
        this.toIP = toIP;
        this.toPort = toPort;

        try {
            socket = new DatagramSocket(fromPort);
            reader = new BufferedReader(new InputStreamReader(System.in));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void run() {

        while (true){
//        准备数据
            try {
                String data = reader.readLine();
                byte[] datas = data.getBytes();
                DatagramPacket packet = new DatagramPacket(datas,0,datas.length,new InetSocketAddress(toIP,toPort));
                socket.send(packet);
                if(data.equals("bye")){
                    break;
                }

            } catch (Exception e) {
                e.printStackTrace();
            }

        }

        socket.close();
    }
}

TalkReceive.java:


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 {
                byte[] container = new byte[1024];
                DatagramPacket packet = new DatagramPacket(container, 0, container.length);
                socket.receive(packet);

//            断开
                byte[] data = packet.getData();
                String revceiveData = new String(data, 0, data.length);
                System.out.println(msgForm+":"+revceiveData.trim());

                if(revceiveData.trim().equals("bye")){
                    break;
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        socket.close();
    }
}

调用实现
TalkStudent:

//学生说话
public class TalkStudent {
    public static void main(String[] args) {
//                                                          学生发送出去的端口
        new Thread(new TalkSend(7777,"localhost",9999)).start();
        //                       学生接收到的端口
        new Thread(new TalkReceive(8888,"老师")).start();
    }
}

TalkTeacher:

// 老师说话
public class TalkTeacher {
    public static void main(String[] args) {
//                                                          老师发送出去的端口
        new Thread(new TalkSend(5555,"localhost",8888)).start();
        //                       老师接收到的端口
        new Thread(new TalkReceive(9999,"学生")).start();
    }
}