Qt网络请求携带cookie

原理：发起请求时携带cookie，请求返回时更新服务器返回的cookie，然后存在本地，以供下次启动时获取

存储格式：本demo使用的是key=value;key2=value2的文本格式存储，只是为了方便qml中的ajax请求携带数据，格式可以自定义

sqlite也是被封装了一层，就是单例模式的sql语句执行而已

从sqlite数据库中根据hostname读取cookie

QList<QNetworkCookie> commonHelper::getLocalCookie(QString host)
{
    QList<QNetworkCookie> allCookie;
    QString cookie;
    QString sqlStr = QString("select * from sc_cookies where host='%1';").arg(host);

    QSqlQuery *reader = sqliteHelper::getInstance()->executeRead(sqlStr);

    if (reader->next())
    {
        cookie = reader->value("cookie").toString();
    }

    QStringList cookies = cookie.split(";");

    for(int i = 0; i < cookies.size(); ++i)
    {
        QStringList aCookie = cookies[i].trimmed().split('=');
        if(aCookie.size()>1){
            allCookie.append(QNetworkCookie(aCookie[0].toUtf8(),aCookie[1].toUtf8()));
        }
    }

    return allCookie;
}

设置cookie到sqlite中

bool commonHelper::setLocalCookie(QString host, QList<QNetworkCookie> allCookie)
{
    QString cookie;
    QList<QNetworkCookie>::iterator i;
    for(i = allCookie.begin(); i != allCookie.end(); ++i){
        cookie += (*i).name() + "=" + (*i).value() + ";";
    }

    int end = cookie.lastIndexOf(';');

    if(end>=0)
    {
        cookie = cookie.mid(0,end);
    }

    QString sqlStr = QString("replace into sc_cookies (host, cookie) values ('%1','%2');").arg(host).arg(cookie);

    int iRet = sqliteHelper::getInstance()->executeQuery(sqlStr);

    return 0==iRet;
}

调用时携带cookie

void httpClient::addCookieHeader(QUrl url)
{
    QVariant cookie;
    if(0==allcookies.size()){
        allcookies = commonHelper::getLocalCookie(url.host());
    }
    cookie.setValue(allcookies);
    qDebug()<<"set cookie:"<<cookie;
    httpRequest.setHeader(QNetworkRequest::CookieHeader, cookie);
}

void httpClient::get(const QString url)
{
    QUrl qUrl(url);
    qDebug("http get %s", qPrintable(url));
    httpRequest.setUrl(qUrl);
    addCookieHeader(qUrl);
    networkAccessManager.get(httpRequest);
}

void httpClient::post(const QString url, const QByteArray &data)
{
    QUrl qUrl(url);
    qDebug("http post %s %s", qPrintable(url), data.toStdString().c_str());
    httpRequest.setUrl(qUrl);
    addCookieHeader(qUrl);
    networkAccessManager.post(httpRequest, data);
}

请求返回中更新cookie

void httpClient::updateCookie(QNetworkReply *reply)
{
    allcookies=reply->manager()->cookieJar()->cookiesForUrl(reply->url());
    commonHelper::setLocalCookie(reply->url().host(), allcookies);
}

void httpClient::serviceRequestFinished(QNetworkReply *reply)
{
    QJsonObject *pJson = nullptr;

    int statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();

    QByteArray data = reply->readAll();
    QString str = QString::fromStdString(data.toStdString()).toUtf8();

    //更新cookie
    updateCookie(reply);

    if(reply->error() == QNetworkReply::NoError)
    {
        QJsonParseError jsonpe;
        QJsonDocument jsonDoc = QJsonDocument::fromJson(str.toUtf8(), &jsonpe);

        if (jsonpe.error == QJsonParseError::NoError)
        {
            pJson = new QJsonObject(jsonDoc.object());
        }
        else
        {
            QString a = QString(reply->readAll());
            qDebug("json error %d", jsonpe.error);
        }
    }
    else
    {
        qDebug("network error %d", reply->error());
    }

    reply->deleteLater();
}