qt MultipartFile

很抱歉，您提供的引用内容中似乎没有与qt MultipartFile相关的信息。MultipartFile通常是Java Spring框架中的一个类，用于处理上传的文件。如果您需要在Qt中处理上传的文件，可以使用QHttpMultiPart类。以下是一个简单的示例代码，演示如何使用QHttpMultiPart上传文件：

QHttpMultiPart *multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType);

QHttpPart imagePart;
imagePart.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("image/jpeg"));
imagePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant("form-data; name=\"image\"; filename=\"test.jpg\""));
QFile *file = new QFile("test.jpg");
file->open(QIODevice::ReadOnly);
imagePart.setBodyDevice(file);
file->setParent(multiPart); // we cannot delete the file now, so delete it with the multiPart

multiPart->append(imagePart);

QUrl url("http://example.com/upload");
QNetworkRequest request(url);

QNetworkAccessManager *manager = new QNetworkAccessManager(this);
QNetworkReply *reply = manager->post(request, multiPart);
multiPart->setParent(reply); // delete the multiPart with the reply

connect(reply, SIGNAL(finished()), this, SLOT(uploadFinished()));