JAVA多人聊天室的代码

以下是一个简单的Java多人聊天室的代码示例：

服务器端代码：

import java.io.*;
import java.net.*;

public class Server {
    private ServerSocket serverSocket;

    public Server(int port) throws IOException {
        serverSocket = new ServerSocket(port);
    }

    public void run() throws IOException {
        while (true) {
            Socket clientSocket = serverSocket.accept();
            ClientHandler clientHandler = new ClientHandler(clientSocket);
            new Thread(clientHandler).start();
        }
    }

    private class ClientHandler implements Runnable {
        private Socket clientSocket;
        private BufferedReader in;
        private PrintWriter out;

        public ClientHandler(Socket socket) throws IOException {
            this.clientSocket = socket;
            in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
            out = new PrintWriter(clientSocket.getOutputStream(), true);
        }

        public void run() {
            try {
                while (true) {
                    String inputLine = in.readLine();
                    if (inputLine == null) {
                        break;
                    }
                    for (ClientHandler client : Server.this.clientHandlers) {
                        client.out.println(inputLine);
                    }
                }
            } catch (IOException e) {
                System.out.println("Exception caught when trying to read from client: " + e);
            } finally {
                try {
                    in.close();
                    out.close();
                    clientSocket.close();
                } catch (IOException e) {
                    System.out.println("Exception caught when trying to close client socket: " + e);
                }
            }
        }
    }

    private List<ClientHandler> clientHandlers = new ArrayList<>();

    public static void main(String[] args) throws IOException {
        Server server = new Server(8000);
        server.run();
    }
}

客户端代码：

import java.io.*;
import java.net.*;

public class Client {
    private BufferedReader in;
    private PrintWriter out;
    private Socket socket;

    public Client(String serverAddress, int port) throws IOException {
        socket = new Socket(serverAddress, port);
        in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
        out = new PrintWriter(socket.getOutputStream(), true);
    }

    public void run() throws IOException {
        BufferedReader console = new BufferedReader(new InputStreamReader(System.in));
        while (true) {
            String inputLine = console.readLine();
            if (inputLine.equals("exit")) {
                break;
            }
            out.println(inputLine);
            String response = in.readLine();
            System.out.println(response);
        }
    }

    public static void main(String[] args) throws IOException {
        Client client = new Client("localhost", 8000);
        client.run();
    }
}

注意：以上是一个简单的Java多人聊天室的代码示例，还有很多需要完善的地方。例如，需要处理客户端退出连接的情况，需要考虑消息的编码和解码等问题。