qt实现tcp多线程服务器

在Qt中实现TCP多线程服务器，通常我们会使用QThread和QTcpServer类来组织并发处理。以下是简要步骤：

1. **包含必要的库**:

   #include <QObject>
   #include <QTcpServer>
   #include <QThread>

2. **创建服务器类**:
创建一个继承自QObject的类，比如TcpServerThread，同时包含QTcpServer实例。

   class TcpServerThread : public QObject
   {
       Q_OBJECT
       QTcpServer *server;
       public:
           explicit TcpServerThread(QObject *parent = nullptr);
           ~TcpServerThread();
       private slots:
           void startServer();
           void newConnection();
       signals:
           void connectionAccepted(int socketDescriptor);
   };

3. **初始化和启动服务器**:

   TcpServerThread::TcpServerThread(QObject *parent) : QObject(parent)
   {
       server = new QTcpServer(this);
       connect(server, &QTcpServer::newConnection, this, &TcpServerThread::newConnection);
       if (!server->listen(QHostAddress::Any, 8000)) { // 端口8000作为示例
           qCritical() << "Could not start server: " << server->errorString();
       } else {
           emit connectionAccepted(server->nextPendingConnection());
       }
   }

   void TcpServerThread::startServer()
   {
       moveToThread(&thread); // 将服务器移到新线程中
       thread.start(); // 启动线程
   }

4. **处理新连接**:

   void TcpServerThread::newConnection()
   {
       QAbstractSocket *socket = server->nextPendingConnection();
       if (socket) {
           // 在这里处理新的客户端连接，如创建一个新线程或QObject来处理每个连接
           QThread *clientThread = new QThread;
           TcpClientHandler *handler = new TcpClientHandler(socket, clientThread);
           handler->moveToThread(clientThread);
           connect(handler, &TcpClientHandler::disconnection, clientThread, &QThread::quit);
           connect(clientThread, &QThread::finished, handler, deleteLater);
           connect(clientThread, &QThread::finished, clientThread, deleteLater);
           clientThread->start();
       }
   }

5. **处理客户端通信**:
`TcpClientHandler` 类用于处理客户端的请求和响应，这通常是异步操作，例如读取数据、发送响应等。

6. **线程管理**:
- 使用QThread对每个客户端连接进行封装，以便在单独的线程中运行，避免阻塞主线程。