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5.QT中关于HTTPClient相关的操作，Json数据传输

發布時間：2024/9/27 c/c++ 29 豆豆

生活随笔收集整理的這篇文章主要介紹了 5.QT中关于HTTPClient相关的操作，Json数据传输小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

新建項目T12HttpClient

T12HttpClient.pro

SOURCES += \

??? main.cpp

QT += network

CONFIG += C++11

main.cpp

#include <QCoreApplication> #include <QNetworkAccessManager> #include <QNetworkRequest> #include <QNetworkReply> ? int main(int argc,char* argv[]) { ??? QCoreApplication app(argc, argv); ??? QNetworkAccessManager* manager = new QNetworkAccessManager; ? QNetworkRequest req; //這里，我訪問的是tomcat服務器 ??? req.setUrl(QUrl("http://localhost:8080/")); ??? manager->get(req); ??? QObject::connect(manager, &QNetworkAccessManager::finished, [](QNetworkReply* reply){ ??????? if(reply->error() != QNetworkReply::NoError) ??????? { ??????????? qDebug() << "Error:" << reply->errorString(); ??????????? return; ??????? } ??????? QByteArray buf = reply->readAll(); ??????? qDebug() << "OK:"<< buf; ??? }); ? ??? return app.exec(); }

運行結果：

Json數據傳輸

#include <QCoreApplication> #include <QNetworkAccessManager> #include <QNetworkRequest> #include <QNetworkReply> #include <QJsonObject> #include <QJsonDocument> ? /** * json 數據傳輸 * @brief main * @param argc * @param argv * @return ?*/ int main(int argc,char* argv[]) { ??? QCoreApplication app(argc, argv); ??? QNetworkAccessManager* manager = new QNetworkAccessManager; ? ??? QJsonObject obj; ??? obj.insert("username", QString("tuzuoquan")); ??? obj.insert("password", QString("tuzuoquan's password")); ? ??? QNetworkRequest req; ??? req.setUrl(QUrl("http://XXX/test.cgi")); ??? manager->post(req, QJsonDocument(obj).toJson()); ??? QObject::connect(manager, &QNetworkAccessManager::finished, [](QNetworkReply* reply){ ??????? if(reply->error() != QNetworkReply::NoError) ??????? { ??????????? qDebug() << "Error:" << reply->errorString(); ??????????? return; ??????? } ??????? QByteArray buf = reply->readAll(); ??????? qDebug() << "OK:"<< buf; ??? }); ? ??? return app.exec(); }

關于cgi的代碼

#include <stdio.h>

#include <unistd.h>

#include <QCoreApplication>

#include <QTcpSocket>

#include <QJsonDocument>

#include <QJsonObject>

#include <QProcessEnvironment>

int main(int argc, char* argv[])

{

??? printf("Content-type:text/html\n\n");

??? QCoreApplication app(argc, argv);

??? QProcessEnvironment envir =

??????? QProcessEnvironment::systemEnvironment();

??? int contentLen = envir.value("CONTENT_LENGTH").toInt();

??? QTcpSocket socket;

??? socket.setSocketDescriptor(STDIN_FILENO,

??????????? QTcpSocket::ConnectedState,

??????????? QTcpSocket::ReadOnly);

??? QByteArray buf;

???

??? QObject::connect(&socket, &QTcpSocket::readyRead, [&](){

??????????????? buf += socket.readAll();

??????????????? if(buf.size()? == contentLen)

??????????????? {

??????????????????? QJsonDocument doc = QJsonDocument::fromJson(buf);

??????????????????? QJsonObject obj = doc.object();

#if 1

??????????????????? QString username = obj.value("username").toString();

??????????????????? QString password = obj.value("password").toString();

??????????????????? printf("username is %s; password is %s",

??????????????????????? username.toUtf8().data(), password.toUtf8().data());

#else

??????????????????? QSqlTableModel model;

??????????????????? model.setTable("tuser");

??????????????????? model.setFilter("username='xx'");

??????????????????? model.select();

??????????????????? if(model.rowCount() == 1)

??????????????????????? printf("Login success");

??????????????????? else

??????????????????????? printf("Login Error");

#endif

??????????????????? app.quit();

??????????????? }

??????????? });

??? return app.exec();

}

上面的程序代碼說明，我們可以通過post的方式順便發送Json數據給服務器！

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