Qt怎么用QNetwork实现上传数据

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1、利用Qt提供的类实现向服务器发送post和get请求

#include <QCoreApplication>#include <QNetworkAcceSSManager>#include <QNetworkRequest>#include <QNetworkReply>#include <QJSONArray>#include <QjsonDocument>#include <QJsonObject>#include <QJsonParseError>#include <QJsonValue>#include <QString>#include <QDebug>#include <QFile>#include <QDateTime>#include <QDir>#include <QThread>#pragma execution_character_set("utf-8")void sendPostRequest(){    QNetworkAccessManager *m_pHttpMgr = new QNetworkAccessManager();    //设置url    QString url = "http://localhost:80/post";    //设置头信息    QNetworkRequest requestInfo;    requestInfo.setUrl(QUrl(url));    requestInfo.setHeader(QNetworkRequest::ContentTypeHeader,QVariant("application/json"));    //requestInfo.setRawHeader("Content-Type","application/json");//服务器要求的数据头部    //requestInfo.setRawHeader("Accept","text/json,*, const QString& strExContentDisposition )    {        m_pData = nullptr;        m_nDataLen = 0;        m_sName = strName;        m_sValue = strValue;        m_sContentType = strContentType;        m_sExContentDisposition = strExContentDisposition;    }    CMultiPartItem::CMultiPartItem(const QString& strName, void* pData, int nLen,        const QString& strContentType , const QString& strExContentDisposition )    {        m_pData = pData;        m_nDataLen = nLen;        m_sName = strName;        m_sContentType = strContentType;        m_sExContentDisposition = strExContentDisposition;    }    //    bool HttpGet(        const HttpRequestData& data,        QByteArray& respData,        int nTimeoutmsec ,        QString& errMsg,        int* pStatuCode )    {        // Assemble Url        QString strUrl = data.strUrl;        if (!data.strServer.isEmpty())            strUrl = data.strServer + ":" + QString::number(data.nPort) + "/" + data.strUrl;        const QUrl url = QUrl::fromUserInput(strUrl);        // Send Get Requeset        QNetworkRequest request(url);        for (auto iter = data.mapHeaders.begin(); iter != data.mapHeaders.end(); iter++)        {            request.setHeader(iter->first, iter->second);        }        QNetworkAccessManager qNetAccessManager;        QNetworkReply* reply = qNetAccessManager.get(request);        if (reply == nullptr)            return false;        // Set time out        QTimer timer;        timer.setInterval(nTimeoutmsec);    // 设置超时时间 30 秒        timer.setSingleShot(true);          // 单次触发        // Set Loop Event        QEventLoop eventLoop;        QObject::connect(&timer, &QTimer::timeout, &eventLoop, &QEventLoop::quit);        QObject::connect(reply, &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);        timer.start();        int eRes = eventLoop.exec(QEventLoop::ExcludeUserInputEvents);        bool bResult = false;        if (timer.isActive())        {            timer.stop();            QNetworkReply::NetworkError replyError = reply->error();            QVariant variant = reply->attribute(QNetworkRequest::httpstatusCodeAttribute);            int nStatusCode = variant.toInt();            if (nullptr != pStatuCode)            {                *pStatuCode = nStatusCode;            }            if (replyError != QNetworkReply::NoError)            {                errMsg = reply->errorString();                qDebug() << "Error String : " << errMsg << "\n";            }            else            {                if (nStatusCode == 200)                {                    // Accept Response                    respData = reply->readAll();                    bResult = true;                }                else                {                    bResult = false;                }            }        }        else        {            QObject::disconnect(reply, &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);            reply->abort();            qDebug() << strUrl << ":Timeout\n";        }        reply->deleteLater();        reply = nullptr;        return bResult;    }    bool HttpPost(const HttpRequestData &data, QByteArray &respData, QString &errMsg, int nTimeoutmsec)    {        // Assemble Url        QString strUrl = data.strUrl;        if (!data.strServer.isEmpty())            strUrl = data.strServer + ":" + QString::number(data.nPort) + "/" + data.strUrl;        const QUrl url = QUrl::fromUserInput(strUrl);        // Send Post Requeset        QNetworkRequest request(url);        for (auto iter = data.mapHeaders.begin(); iter != data.mapHeaders.end(); iter++)        {            request.setHeader(iter->first, iter->second);        }        QNetworkAccessManager qNetAccessManager;        QNetworkReply* reply = qNetAccessManager.post(request, data.bytePostData);        if (reply == nullptr)            return false;        // Set time out        QTimer timer;        timer.setInterval(nTimeoutmsec);    // 设置超时时间 30 秒        timer.setSingleShot(true);          // 单次触发        // Set Loop Event        QEventLoop eventLoop;        QObject::connect(&timer, &QTimer::timeout, &eventLoop, &QEventLoop::quit);        QObject::connect(reply, &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);        timer.start();        eventLoop.exec(QEventLoop::ExcludeUserInputEvents);        bool bResult = false;        if (timer.isActive())        {            timer.stop();            QNetworkReply::NetworkError replyError = reply->error();            if (replyError != QNetworkReply::NoError)            {                errMsg = reply->errorString();                qDebug() << "Error String : " << reply->errorString() << "\n";            }            else            {                QVariant variant = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);                int nStatusCode = variant.toInt();                if (nStatusCode == 200)                {                    // Accept Response                    respData = reply->readAll();                    bResult = true;                }            }        }        else        {            QObject::disconnect(reply, &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);            reply->abort();            errMsg = (strUrl + ":Timeout\n");            qDebug() << strUrl << ":Timeout\n";        }        reply->deleteLater();        reply = nullptr;        return bResult;    }    bool UploadMultipartData(const HttpRequestData &data, const CMultiPartDatas &multiPartDatas, QByteArray &respData, QString &errMsg, int nTimeoutmsec)    {        QString strUrl = data.strUrl;        if (!data.strServer.isEmpty())            strUrl = data.strServer + ":" + QString::number(data.nPort) + "/" + data.strUrl;        const QUrl url = QUrl::fromUserInput(strUrl);        // 创建网络请求        QNetworkRequest request;        request.setUrl(url);        QHttpMultiPart httpMultiPart(QHttpMultiPart::FORMDataType);        // 解决Qt自动解析MultiPart得到boundary=带双引号问题        for (auto iter = data.mapHeaders.begin(); iter != data.mapHeaders.end(); iter++)        {            request.setHeader(iter->first, iter->second);        }        request.setHeader(QNetworkRequest::ContentTypeHeader, "multipart/form-data;boundary=" + httpMultiPart.boundary());        FOR_EACH(itemPart, multiPartDatas)        {            QHttpPart httpPart;            {                QString strContentDisposition = QString("form-data; name=\"%1\"%2").arg(itemPart.m_sName)                    .arg(itemPart.m_sExContentDisposition.isEmpty() ? "" : "; " + itemPart.m_sExContentDisposition);                httpPart.setHeader(QNetworkRequest::ContentDispositionHeader, strContentDisposition.toUtf8());                if (itemPart.m_sContentType.isEmpty() == false)                {                    httpPart.setHeader(QNetworkRequest::ContentTypeHeader, itemPart.m_sContentType.toUtf8());                }                if (itemPart.m_pData)                {                    httpPart.setBody(QByteArray((const char*)itemPart.m_pData, itemPart.m_nDataLen));                }                else                {                    httpPart.setBody(itemPart.m_sValue.toUtf8());                }            }            httpMultiPart.append(httpPart);        }        QNetworkAccessManager qNetAccessManager;        QNetworkReply* reply = qNetAccessManager.post(request, &httpMultiPart);        if (reply == nullptr)        {            errMsg = QObject::tr("发送失败");            return false;        }        QList<QByteArray> headers = reply->rawHeaderList();        // Set time out        QTimer timer;        timer.setInterval(nTimeoutmsec);    // 设置超时时间 30 秒        timer.setSingleShot(true);          // 单次触发        // Set Loop Event        QEventLoop eventLoop;        QObject::connect(&timer, &QTimer::timeout, &eventLoop, &QEventLoop::quit);        QObject::connect(reply, &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);        timer.start();        eventLoop.exec(QEventLoop::ExcludeUserInputEvents);        bool bResult = false;        if (timer.isActive())        {            timer.stop();            QNetworkReply::NetworkError replyError = reply->error();            if (replyError != QNetworkReply::NoError)            {                errMsg = reply->errorString();                qDebug() << "Error String : " << reply->errorString() << "\n";            }            else            {                QVariant variant = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);                int nStatusCode = variant.toInt();                if (nStatusCode == 200)                {                    // Accept Response                    respData = reply->readAll();                    bResult = true;                }            }        }        else        {            QObject::disconnect(reply, &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);            reply->abort();            qDebug() << data.strUrl << ":Timeout\n";        }        reply->deleteLater();        reply = nullptr;        return bResult;    }    bool UploadMultipartData(const QString &strURL, const CMultiPartDatas &multiPartDatas, QByteArray &respData, QString &errMsg, int nTimeoutmsec)    {        // 创建网络请求        QNetworkRequest request;        request.setUrl(QUrl::fromUserInput(strURL));        QHttpMultiPart httpMultiPart(QHttpMultiPart::FormDataType);        // 解决Qt自动解析MultiPart得到boundary=带双引号问题        request.setHeader(QNetworkRequest::ContentTypeHeader, "multipart/form-data;boundary=" + httpMultiPart.boundary());        foreach (itemPart, multiPartDatas)        {            QHttpPart httpPart;            {                QString strContentDisposition = QString("form-data; name=\"%1\"%2").arg(itemPart.m_sName)                    .arg(itemPart.m_sExContentDisposition.isEmpty() ? "" : "; " + itemPart.m_sExContentDisposition);                httpPart.setHeader(QNetworkRequest::ContentDispositionHeader, strContentDisposition.toUtf8());                if (itemPart.m_sContentType.isEmpty() == false)                {                    httpPart.setHeader(QNetworkRequest::ContentTypeHeader, itemPart.m_sContentType.toUtf8());                }                if (itemPart.m_pData)                {                    httpPart.setBody(QByteArray((const char*)itemPart.m_pData, itemPart.m_nDataLen));                }                else                {                    httpPart.setBody(itemPart.m_sValue.toUtf8());                }            }            httpMultiPart.append(httpPart);        }        QNetworkAccessManager qNetAccessManager;        QNetworkReply* reply = qNetAccessManager.post(request, &httpMultiPart);        if (reply == nullptr)        {            errMsg = QObject::tr("发送失败");            return false;        }        QList<QByteArray> headers = reply->rawHeaderList();        // Set time out        QTimer timer;        timer.setInterval(nTimeoutmsec);    // 设置超时时间 30 秒        timer.setSingleShot(true);          // 单次触发        // Set Loop Event        QEventLoop eventLoop;        QObject::connect(&timer, &QTimer::timeout, &eventLoop, &QEventLoop::quit);        QObject::connect(reply, &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);        timer.start();        eventLoop.exec(QEventLoop::ExcludeUserInputEvents);        bool bResult = false;        if (timer.isActive())        {            timer.stop();            QNetworkReply::NetworkError replyError = reply->error();            if (replyError != QNetworkReply::NoError)            {                errMsg = reply->errorString();                qDebug() << "Error String : " << reply->errorString() << "\n";            }            else            {                QVariant variant = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);                int nStatusCode = variant.toInt();                if (nStatusCode == 200)                {                    // Accept Response                    respData = reply->readAll();                    bResult = true;                }            }        }        else        {            QObject::disconnect(reply, &QNetworkReply::finished, &eventLoop, &QEventLoop::quit);            reply->abort();            qDebug() << strURL << ":Timeout\n";        }        reply->deleteLater();        reply = nullptr;        return bResult;    }}

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