如何在Java中实现多线程的Socket服务器？

import java.io.*;
import java.net.*;
public class MultiThreadedServer {
    public static void main(String[] args) {
        int port = 9876; // 服务器监听的端口号
        try (ServerSocket serverSocket = new ServerSocket(port)) {
            System.out.println("服务器正在监听端口 " + port);
            // 使用线程池创建多个线程
            ExecutorService executorService = Executors.newCachedThreadPool();
            while (true) {
                Socket socket = serverSocket.accept(); // 等待客户端连接
                System.out.println("新客户端已连接：" + socket.getInetAddress());
                // 创建一个新线程来处理该客户端连接
                executorService.execute(new ClientHandler(socket));
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
class ClientHandler implements Runnable {
    private Socket socket;
    public ClientHandler(Socket socket) {
        this.socket = socket;
    }
    @Override
    public void run() {
        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            PrintWriter writer = new PrintWriter(socket.getOutputStream(), true);
            writer.println("欢迎使用服务器！");
            String message;
            while ((message = reader.readLine()) != null) {
                if (message.equalsIgnoreCase("exit")) {
                    writer.println("服务器断开连接，结束服务！");
                    break;
                }
                writer.println("收到消息：" + message);
            }
            reader.close();
            writer.close();
            socket.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}