5.QT中关于HTTPClient相关的操作，Json数据传输

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;

//这里，我访问的是tomcat服务器

    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();

}

运行结果：

Json数据传输

#include <QCoreApplication>

#include <QNetworkAccessManager>

#include <QNetworkRequest>

#include <QNetworkReply>

#include <QJsonObject>

#include <QJsonDocument>

/**

 * json 数据传输

 * @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();

}

关于cgi的代码

#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();

}

上面的程序代码说明，我们可以通过post的方式顺便发送Json数据给服务器！