http 上传图片  急！ [复制链接]

我这边需要通过http的方式把图片上传给服务器，但是服务器给出了报错：Required request part 'file' is not present，客户端报的错误：server replied: Internal Server Error。
在postMan中可以正确执行：

图片:postman.PNG

我的代码：

        //file
        QImage map(info.filePath());
        QByteArray byteArray;
        QDataStream write(&byteArray, QIODevice::WriteOnly);
        write << map;
        QString fileBinary = QString::fromLocal8Bit(byteArray.toBase64());
        qDebug() << QString("%1大小%2").arg(name).arg(fileBinary.size());
        ui->textEdit->append(QString("%1大小%2").arg(name).arg(fileBinary.size()));
//上面的代码主要是把图片二进制数据读到字符串fileBinary


        //param
        QJsonObject object;
        QString expressNumber = name.section(QChar('_'), 0, 0);
        object.insert("expressNumber", expressNumber);
        object.insert("nameNumber", "574901"); //网点代号
        object.insert("opCode", "182"); //操作代码
        object.insert("snNumber", mac); //设备编码
        object.insert("imgSource", info.filePath()); //图片来源
        object.insert("extend", "");
        QString param = QJsonDocument(object).toJson();
        qDebug() << "param" << param;
        ui->textEdit->append("param:" + param);
        //signature
        int length = param.length();
        QString str = QString::asprintf("%08d", length);
        qDebug() << "param长度" << str;
        ui->textEdit->append("param长度" + str);
        QString str1 = str + param;
        QCryptographicHash cryptographic(QCryptographicHash::Md5);
        QString signature = cryptographic.result().toHex();
        ui->textEdit->append("signature:" + signature);
        //url
        QString url = QString("file=%1&signature=%2&param=%3")
        .arg(fileBinary).arg(signature).arg(param);
        qDebug() << url;

        //同步
        QEventLoop loop(this);
        QNetworkAccessManager manager;
        QNetworkRequest request;
        request.setUrl(QUrl(url1));
        qDebug() << request.url();
        request.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("multipart/form-data"));
        QNetworkReply *reply = manager.post(request, url.toUtf8());
        connect(&manager, &QNetworkAccessManager::finished, &loop, &QEventLoop::quit);
        loop.exec();

红色部分为关键部分，因为上面说是file这个错误，大家帮忙看看，这个file为什么错误，

    

QHttpPart filePart;      
filePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"file\";filename=\"文件名\""));

主要 是没那个file。你网上再搜索一下。就能找到解决方法了。发送的内容类似这样的

Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW

------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="isFullEnable"

true
------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="11"; filename="11.jpg"
Content-Type: image/jpeg


------WebKitFormBoundary7MA4YWxkTrZu0gW--