Qt开发技术分享之Http Multipart上传文件到Java

通过 Qt 来实现来上传文件相对麻烦一点，参考Qt 官方简单例子总结了一下，可以直接使用。

相关模块

• QNetworkAccessManager 发起 GET/POST 请求
• QNetworkReply 描述响应信息
• QHttpMultiPart 模拟表单域
• QNetworkRequest 构建请求地址等信息

实例部分代码

1、h文件部分代码

private:
    void uploadControlParameterDownloadFile();
    QFile *controlParameterDownloadFile;
    QNetworkReply *uploadControlParameterDownloadFileReply;

public slots:
    void httpUploadControlParameterDownloadFileFinished();

2、cpp文件部分代码

void DataAnalysis::uploadControlParameterDownloadFile()
{
    // 传输文件：电机控制配置参数
    QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);
    QString path              = QString("resources/net/control_parameter_download_1.ini");
    QHttpPart imagePart;

    imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("ini"));

    controlParameterDownloadFile = new QFile(path);
    QFileInfo info(controlParameterDownloadFile->fileName());
    uint timeT = QDateTime::currentDateTime().toTime_t();
    QString fileNewName =
        QString("%1@%2_%3.%4").arg(DeviceSystem::instance()->getPrintControl()->getPrintUuid()).arg(timeT).arg(info.baseName()).arg(info.suffix());
    QLOG_INFO() << "uploadParameterFile fileNewName == " << fileNewName << endl;
    QString contentDispositionHeader = QString("form-data; name=\"file\"; filename=\"%1\"").arg(fileNewName);
    imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant(contentDispositionHeader));

    controlParameterDownloadFile->open(QIODevice::ReadOnly);

    imagePart.setBodyDevice(controlParameterDownloadFile);
    controlParameterDownloadFile->setParent(multiPart);
    multiPart->append(imagePart);

    QUrl url(DATA_ANALYSIS_URL_INI_FILE_UPLOAD);
    QNetworkRequest request(url);
    QNetworkAccessManager m_httpNAM;
    uploadControlParameterDownloadFileReply = m_httpNAM.post(request, multiPart);
    multiPart->setParent(uploadControlParameterDownloadFileReply);

    connect(uploadControlParameterDownloadFileReply, SIGNAL(finished()), this, SLOT(httpUploadControlParameterDownloadFileFinished()));
    QEventLoop eventLoop;
    connect(&m_httpNAM, SIGNAL(finished(QNetworkReply *)), &eventLoop, SLOT(quit()));
    eventLoop.exec();
}

void DataAnalysis::httpUploadControlParameterDownloadFileFinished()
{
    if (uploadControlParameterDownloadFileReply->error() == QNetworkReply::NoError)
    {
        QLOG_INFO() << "upload file finished";

        controlParameterDownloadFile->flush();
        controlParameterDownloadFile->close();
        uploadControlParameterDownloadFileReply->deleteLater();
        uploadControlParameterDownloadFileReply = nullptr;
        delete controlParameterDownloadFile;
        controlParameterDownloadFile = nullptr;
    }
    else
    {
        QLOG_ERROR() << "error string:" << uploadControlParameterDownloadFileReply->errorString();
        uploadControlParameterDownloadFileReply->deleteLater();
    }
}

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