Qt实现客户端/服务器端登录验证.数据传输使用md5加密

#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); this->tcpServer = NULL; this->tcpSocket = NULL; this->ui->label_IP->setText(this->GetLocalIPAddress()); this->initConnect(); } MainWindow::~MainWindow() { delete ui; if(this->tcpSocket != NULL) { this->tcpSocket->close(); delete this->tcpSocket; } if(this->tcpServer != NULL) { this->tcpServer->close(); delete this->tcpServer; } } /** * @brief MainWindow::initConnect * @caption 初始化QObject::connect()函数 */ void MainWindow::initConnect() { connect(this->ui->spinBox,SIGNAL(valueChanged(int)),this,SLOT(setPort(int))); connect(this->ui->pushButton_Start,SIGNAL(clicked()),this,SLOT(startTcpServer())); connect(this->ui->pushButton_Close,SIGNAL(clicked()),this,SLOT(closeTcpServer())); } /** * @brief MainWindow::setPort * @param port 端口号 */ void MainWindow::setPort(int port) { this->ui->label_Port->setText(QString::number(port)); } /** * @brief MainWindow::startTcpServer 开启服务器 */ void MainWindow::startTcpServer() { this->tcpServer = new QTcpServer(this); this->tcpServer->listen(QHostAddress::Any,this->ui->spinBox->value()); connect(this->tcpServer,SIGNAL(newConnection()),this,SLOT(newConnect())); this->ui->label_SS->setText("Running..."); } /** * @brief MainWindow::closeTcpServer 关闭服务器 */ void MainWindow::closeTcpServer() { if(this->tcpSocket != NULL) { this->tcpSocket->close(); } if(this->tcpServer != NULL) { this->tcpServer->close(); } this->ui->label_SS->setText("Stop."); } /** * @brief MainWindow::newConnect 新的Socket连接 */ void MainWindow::newConnect() { this->tcpSocket = this->tcpServer->nextPendingConnection(); connect(this->tcpSocket,SIGNAL(readyRead()),this,SLOT(readMessages())); } /** * @brief MainWindow::verify 执行登录验证的操作 * @param msg 欲验证的加密报文 * @return 验证成功，返回true；否则，返回false。 */ bool MainWindow::verify(QString msg) { //数据库连接 QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL"); db.setHostName("127.0.0.1"); db.setDatabaseName("liyang"); db.setUserName("root"); db.setPassword(""); if(!db.open()){ QMessageBox::information(this, "信息提示", "数据库连接失败.", QMessageBox::Yes | QMessageBox::No, QMessageBox::Yes); db.close(); exit(EXIT_FAILURE); } QSqlQuery query;//获取数据库信息 query.exec("select * from ly_user"); //服务器端的数据同样采取加密操作，比较的是加密后的密文是否相同 QCryptographicHash md5(QCryptographicHash::Md5); //遍历数据库信息，查询判断是否有该用户 while(query.next()) { QString tmp = query.value(2).toString() + "#" + query.value(1).toString(); md5.addData(tmp.toUtf8()); tmp = ""; tmp.append(md5.result().toHex()); if(tmp == msg) { return true; } } db.close(); return false; } /** * @brief MainWindow::readMessages 读取发送来的数据 */ void MainWindow::readMessages() { QByteArray qba = this->tcpSocket->readAll(); QString msg = QVariant(qba).toString(); //this->setWindowTitle(msg); if(this->verify(msg)) { msg = "true"; } else { msg = "false"; } this->sendMessages(msg); } /** * @brief MainWindow::sendMessages 发送回复消息，以说明登录验证是否成功。 * 如果回复"true"，表示验证成功；否则，回复为"false",表示验证失败。 */ void MainWindow::sendMessages(QString msg) { this->tcpSocket->write(msg.toStdString().c_str(), strlen(msg.toStdString().c_str())); } /** * @brief QT获取本机IP地址 */ QString MainWindow::GetLocalIPAddress() { QString vAddress; #ifdef _WIN32 QHostInfo vHostInfo = QHostInfo::fromName(QHostInfo::localHostName()); QList<QHostAddress> vAddressList = vHostInfo.addresses(); #else QList<QHostAddress> vAddressList = QNetworkInterface::allAddresses(); #endif for(int i = 0; i < vAddressList.size(); i++) { if(!vAddressList.at(i).isNull() && vAddressList.at(i) != QHostAddress::LocalHost && vAddressList.at(i).protocol() == QAbstractSocket::IPv4Protocol) { vAddress = vAddressList.at(i).toString(); break; } } return vAddress; }