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要實現一個簡易的聊天室，可以使用 Java 的 Socket 編程實現。下面是一個簡單的實現示例：

服務器端代碼：

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.ArrayList;
import java.util.List;

public class ChatServer {private ServerSocket serverSocket;
    private List<ClientHandler> clients = new ArrayList<>();

    public static void main(String[] args) {ChatServer server = new ChatServer();
        server.start(8888);
    }

    public void start(int port) {try {serverSocket = new ServerSocket(port);
            System.out.println(" 服務器已啟動，監聽端口：" + port);

            while (true) {Socket clientSocket = serverSocket.accept();
                System.out.println(" 客戶端已連接：" + clientSocket.getRemoteSocketAddress());

                // 創建一個新的客戶端處理器
                ClientHandler clientHandler = new ClientHandler(clientSocket);
                clients.add(clientHandler);
                clientHandler.start();}
        } catch (IOException e) {e.printStackTrace();
        }
    }

    public synchronized void broadcast(String message, ClientHandler excludeClient) {for (ClientHandler client : clients) {if (client != excludeClient) {client.sendMessage(message);
            }
        }
    }

    public synchronized void removeClient(ClientHandler client) {clients.remove(client);
    }

    private class ClientHandler extends Thread {private Socket clientSocket;
        private InputStream inputStream;
        private OutputStream outputStream;

        public ClientHandler(Socket clientSocket) {this.clientSocket = clientSocket;
        }

        @Override
        public void run() {try {inputStream = clientSocket.getInputStream();
                outputStream = clientSocket.getOutputStream();

                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = inputStream.read(buffer)) != -1) {String message = new String(buffer, 0, bytesRead);
                    System.out.println(" 收到消息：" + message);

                    // 廣播消息給其他客戶端
                    broadcast(message, this);
                }
            } catch (IOException e) {e.printStackTrace();
            } finally {try {clientSocket.close();
                    removeClient(this);
                } catch (IOException e) {e.printStackTrace();
                }
            }
        }

        public void sendMessage(String message) {try {outputStream.write(message.getBytes());
                outputStream.flush();} catch (IOException e) {e.printStackTrace();
            }
        }
    }
}

客戶端代碼：

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Scanner;

public class ChatClient {private Socket socket;
    private InputStream inputStream;
    private OutputStream outputStream;

    public static void main(String[] args) {ChatClient client = new ChatClient();
        client.connect("localhost", 8888);
    }

    public void connect(String serverAddress, int serverPort) {try {socket = new Socket(serverAddress, serverPort);
            System.out.println(" 已連接到服務器：" + serverAddress + ":" + serverPort);

            inputStream = socket.getInputStream();
            outputStream = socket.getOutputStream();

            // 接收和發送消息的線程
            Thread receiveThread = new Thread(this::receiveMessages);
            Thread sendThread = new Thread(this::sendMessages);

            receiveThread.start();
            sendThread.start();} catch (IOException e) {e.printStackTrace();
        }
    }

    public void receiveMessages() {try {byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {String message = new String(buffer, 0, bytesRead);
                System.out.println(message);
            }
        } catch (IOException e) {e.printStackTrace();
        }
    }

    public void sendMessages() {Scanner scanner = new Scanner(System.in);
        try {while (true) {String message = scanner.nextLine();
                outputStream.write(message.getBytes());
                outputStream.flush();}
        } catch (IOException e) {e.printStackTrace();
        }
    }
}

在命令行中，先運行服務器端的 ChatServer 類，再運行客戶端的 ChatClient 類?？蛻舳丝梢暂斎胂?，然后服務器端會將消息廣播給其他客戶端。注意要將客戶端的 connect 方法中的 serverAddress 改為服務器的 IP 地址。

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