QTcpServer
方法：
1.listen()
2.hasPendingConnections()
3.nextPendingConnection()
4.setMaxPendingConnections()
5.errorString()
6.incomingConnection(qintptr socketDescriptor)
信號(hào)：
1.newConnection()
2.acceptError(QAbstractSocket::SocketError socketError)


一般步驟：
1.listen
2.響應(yīng)newConnection信號(hào)
3.處理客戶端連接
4.關(guān)閉客戶端連接

用telnet 127.0.0.1 7 就可以登錄

代碼如下：

echoserver.h

#ifndef ECHOSERVER_H #define ECHOSERVER_H #include <QObject> #include <QTcpServer> class EchoServer : public QTcpServer { Q_OBJECT public: EchoServer(QObject *parent=0); ~EchoServer(); protected slots: void onNewConnection(); void onReadyRead(); private: void echo(QTcpSocket *sock); }; #endif // ECHOSERVER_H

echoserver.cpp

#include "echoserver.h" #include <QTcpSocket> EchoServer::EchoServer(QObject *parent) :QTcpServer(parent) { connect(this,SIGNAL(newConnection()),this,SLOT(onNewConnection())); } EchoServer::~EchoServer(){ } void EchoServer::onNewConnection(){ while(hasPendingConnections()){ QTcpSocket *sock=nextPendingConnection(); connect(sock,SIGNAL(readyRead()),this,SLOT(onReadyRead())); connect(sock,SIGNAL(disconnected()),sock,SLOT(deleteLater())); if(sock->bytesAvailable()>0){ echo(sock); } } } void EchoServer::onReadyRead(){ QTcpSocket *sock=qobject_cast<QTcpSocket*>(sender()); //取得當(dāng)前Socket對(duì)象 echo(sock); } void EchoServer::echo(QTcpSocket *sock){ QByteArray inData=sock->readAll(); qDebug()<<inData; sock->flush(); }

main.cpp

#include <QCoreApplication> #include "echoserver.h" int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); EchoServer server; server.listen(QHostAddress::Any,7); return a.exec(); }

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