Java基础 03即时聊天案例简易版 164难

最新推荐文章于 2022-03-08 20:20:43 发布

原创最新推荐文章于 2022-03-08 20:20:43 发布 · 315 阅读

1 ·

CC 4.0 BY-SA版权

文章标签：

#Java基础 #即时聊天简易版

Java 专栏收录该内容

102 篇文章

订阅专栏

本文介绍了一种基于TCP协议实现多客户端间通信的方案，详细解释了服务器如何作为中转站处理客户端间的通信请求，包括消息类型定义、消息包设计、服务器端与客户端的代码实现，以及如何启动和管理客户端线程。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

多客户端之间的通信
服务器可以与多个客户端实现通信了，那我们真正的目的是要实现多个客户端之间的通信，使用TCP协议实现的方案是：

客户端的数据包通过服务器中转，发送到另一个客户端，如下图所示：
在这里插入图片描述

这个数据包包含的内容

客户端A要发送消息给客户端B
首先发送给服务器中处理客户端A的线程A1
A1检索到A要发送给B 所以A1联系B1 通过B1回传给客户端B 完成通信

然后吧这个服务器中的线程A1 B1就有了联系所以不能再单独放了
把他们统一的管理起来用集合的方式 Vector
在这里插入图片描述
MessageType

package com.vince.communication;

/**
 * Created by vince on 2017/6/7.
 */
public final class MessageType {
    public static final int TYPE_LOGIN = 0x1;//登录消息类型
    public static final int TYPE_SEND = 0x2;//发送消息的类型
}

消息包 Message
一会我们要发送这个消息对象怎么发送这里待会我们使用流发送所以对象要序列化

package com.vince.communication;

import java.io.Serializable;

/**
 * Created by vince on 2017/6/7.
 * 消息包
 */
public class Message implements Serializable{
    private String from;//发送者
    private String to;//接收者
    private int type;//消息类型
    private String info;//消息

    public String getFrom() {
        return from;
    }

    public void setFrom(String from) {
        this.from = from;
    }

    public String getTo() {
        return to;
    }

    public void setTo(String to) {
        this.to = to;
    }

    public int getType() {
        return type;
    }

    public void setType(int type) {
        this.type = type;
    }

    public String getInfo() {
        return info;
    }

    public void setInfo(String info) {
        this.info = info;
    }

    public Message() {
    }

    public Message(String from, String to, int type, String info) {
        this.from = from;
        this.to = to;
        this.type = type;
        this.info = info;
    }

    @Override
    public String toString() {
        return "Message{" +
                "from='" + from + '\'' +
                ", to='" + to + '\'' +
                ", type=" + type +
                ", info='" + info + '\'' +
                '}';
    }
}

服务器端

package com.vince.communication;

import javax.security.sasl.SaslClient;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Vector;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * Created by vince on 2017/6/7.
 * 服务器端
 */
public class Server {

    public static void main(String[] args) {
        //保存客户端处理的线程
        Vector<UserThread> vector = new Vector<>();
        ExecutorService es = Executors.newFixedThreadPool(5);
        //创建服务器端的Socket
        try {
            ServerSocket server = new ServerSocket(8888);
            System.out.println("服务器已启动，正在等待连接...");
            while(true){
                Socket socket = server.accept();
                UserThread user = new UserThread(socket,vector);
                es.execute(user);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

/**
 * 客户端处理的线程
 */
class UserThread implements Runnable{
    private String name;//客户端的用户名称（唯一）
    private Socket socket;
    private Vector<UserThread> vector;//客户端处理线程的集合
    private ObjectInputStream ois;
    private ObjectOutputStream oos;
    private boolean flag = true;

    public UserThread(Socket socket,Vector<UserThread> vector){
        this.socket = socket;
        this.vector = vector;
        vector.add(this);
    }
    @Override
    public void run() {
        try{
            System.out.println("客户端"+socket.getInetAddress().getHostAddress()+"已连接");
            ois = new ObjectInputStream(socket.getInputStream());
            oos = new ObjectOutputStream(socket.getOutputStream());

            while (flag){
                //读取消息对象
                Message msg  = (Message)ois.readObject();
                int type = msg.getType();
                switch (type){
                    case MessageType.TYPE_SEND:
                        String to = msg.getTo();
                        UserThread ut;
                        int size = vector.size();
                        for (int i = 0; i < size; i++) {
                            ut = vector.get(i);
                            if (to.equals(ut.name) && ut!=this){
                                ut.oos.writeObject(msg);
                                break;
                            }
                        }
                        break;
                    case MessageType.TYPE_LOGIN:
                        name = msg.getFrom();
                        msg.setInfo("欢迎你：");
                        oos.writeObject(msg);
                        break;
                }
            }
            ois.close();
            oos.close();
        }catch (IOException | ClassNotFoundException e){
            e.printStackTrace();
        }
    }
}

客户端

package com.vince.communication;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.Socket;
import java.util.Scanner;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * Created by vince on 2017/6/7.
 */
public class Client {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        ExecutorService es = Executors.newSingleThreadExecutor();
        try {
            Socket socket = new Socket("localhost", 8888);
            System.out.println("服务器连接成功");
            ObjectOutputStream oos = new ObjectOutputStream(socket.getOutputStream());
            ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
            //向服务器发送登录信息
            System.out.println("请输入名称：");
            String name = input.nextLine();
            Message msg = new Message(name, null, MessageType.TYPE_LOGIN, null);
            oos.writeObject(msg);
            msg = (Message) ois.readObject();
            System.out.println(msg.getInfo() + msg.getFrom());

            //启动读取消息的线程
            es.execute(new ReadInfoThread(ois));

            //使用主线程来实现发送消息
            boolean flag = true;
            while(flag){
                msg = new Message();
                System.out.println("To:");
                msg.setTo(input.nextLine());
                msg.setFrom(name);
                msg.setType(MessageType.TYPE_SEND);
                System.out.println("Info:");
                msg.setInfo(input.nextLine());
                oos.writeObject(msg);
            }

        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}

//读取消息
class ReadInfoThread implements Runnable {
    private ObjectInputStream in;

    public ReadInfoThread(ObjectInputStream in){
        this.in = in;
    }
    private boolean flag = true;

    public void setFlag(boolean flag) {
        this.flag = flag;
    }

    @Override
    public void run() {
        try {
            while (flag) {

                Message message = (Message) in.readObject();
                System.out.println("[" + message.getFrom() + "]对我说：" + message.getInfo());

            }
            if(in!=null){
                in.close();
            }
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
    }
}