5.QT中关于HTTPClient相关的操作，Json数据传输



1. 新建项目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;

//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！