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Java 多線程實現聊天室：客戶端與服務端完整代碼

編輯：Java 相關知識

核心技術點

Swing GUI 程式設計與事件監聽
Socket 網絡通訊（ServerSocket、Socket）
多線程併發處理

客戶端關鍵邏輯

// 連接服務器
Socket socket = new Socket(serverIP, serverPort);
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
PrintWriter writer = new PrintWriter(socket.getOutputStream());

// 接收消息線程
new Thread(() -> {
    String msg;
    while ((msg = reader.readLine()) != null) {
        textArea.append(msg + "\n");
    }
}).start();

// 發送消息
writer.println(nickname + "：" + content);
writer.flush();

服務端關鍵邏輯

ServerSocket server = new ServerSocket(port);
List<PrintWriter> clients = new ArrayList<>();

while (true) {
    Socket client = server.accept();
    PrintWriter writer = new PrintWriter(client.getOutputStream());
    clients.add(writer);
    new Thread(new ClientHandler(client, clients)).start();
}

// 廣播消息
void broadcast(String msg) {
    for (PrintWriter w : clients) {
        w.println(msg);
        w.flush();
    }
}

ClientHandler 內部類

class ClientHandler implements Runnable {
    private BufferedReader reader;
    private List<PrintWriter> allWriters;

    public void run() {
        String msg;
        while ((msg = reader.readLine()) != null) {
            broadcast(msg);  // 轉發給所有客戶端
        }
    }
}