QT使用Http协议通信的实现示例
作者:Acnidouwo
使用QT进行应用开发时,有时候需要进行客户端和服务端的网络通信,本文主要介绍了QT使用Http协议通信的实现示例,具有一定的参考价值,感兴趣的可以了解一下
介绍
使用QT进行应用开发时,有时候需要进行客户端和服务端的网络通信,网络通信常用的一种协议就是http协议。QT对http协议进行了封装,下面将介绍两种http通信方式的使用。
在使用http时需要在pro文件中添加对应的模块。
QT += network
http主要两种通信方式为get和post两种
1.多个独立参数GET请求
int NormalGetRequest(QString paramer1, QString paramer2) { //生成对应的网络请求 QNetworkRequest request; QString scheme = "http"; QString serverAddr = "192.168.0.1"; QString port = "80"; QString requestHeader = scheme + QString("://") + serverAddr + QString(":") + port; QString fullRequest = requestHeader + QString("/api/vi/user/getrequest?paramer1=%1¶mer2=%2").arg(paramer1).arg(paramer2); request.setUrl(QUrl(fullRequest)); //发送Get请求 QNetworkAccessManager manager; QNetworkReply *reply = manager.get(request); QEventLoop eventLoop; QObject::connect(reply, SIGNAL(finished()),&eventLoop, SLOT(quit())); eventLoop.exec(QEventLoop::ExcludeUserInputEvents); //对请求的返回异常进行处理 if(reply->error() != QNetworkReply::NoError) { return reply->error(); } //解析返回的Json结果 QByteArray replyData = reply->readAll(); QJsonParseError json_error; QJsonDocument jsonDoc(QJsonDocument::fromJson(replyData, &json_error)); if(json_error.error != QJsonParseError::NoError) { return -1; } QJsonObject rootObj = jsonDoc.object(); QString codeStr = rootObj.value("code").toString(); if (codeStr.compare("200") == 0) { //返回代码为200的时候证明请求成功对包含的结构数据进行处理 if(rootObj.contains("result")) { } return 0; } else { //请求失败对对应的处理 return codeStr.toInt(); } }
2.参数数组GET请求
int GetRequestWithArray(QVector<QString> m_filePathVector) { QJsonArray array; for(int index=0; index<m_filePathVector.size(); ++index) { QJsonObject object; object.insert("index",QString::number(index)); object.insert("path",m_filePathVector.at(index)); array.append(object); } QJsonDocument document; document.setArray(array); QString arrayString = document.toJson(QJsonDocument::Compact); //生成对应的网络请求 QNetworkRequest request; QString scheme = "http"; QString serverAddr = "192.168.0.1"; QString port = "80"; QString requestHeader = scheme + QString("://") + serverAddr + QString(":") + port; QString fullRequest = requestHeader + QString("/api/vi/user/getarray?paramers=%1").arg(arrayString); request.setUrl(QUrl(fullRequest)); //获取错误 QNetworkAccessManager manager; QNetworkReply *reply = manager.get(request); QEventLoop eventLoop; QObject::connect(reply, SIGNAL(finished()),&eventLoop, SLOT(quit())); eventLoop.exec(QEventLoop::ExcludeUserInputEvents); if(reply->error() != QNetworkReply::NoError) { return reply->error(); } //解析返回的Json结果 QByteArray replyData = reply->readAll(); QJsonParseError json_error; QJsonDocument jsonDoc(QJsonDocument::fromJson(replyData, &json_error)); if(json_error.error != QJsonParseError::NoError) { return -1; } QJsonObject rootObj = jsonDoc.object(); QString codeStr = rootObj.value("code").toString(); if (codeStr.compare("200") == 0) { //返回代码为200的时候证明请求成功对包含的结构数据进行处理 if(rootObj.contains("result")) { } return 0; } else { //请求失败对对应的处理 return codeStr.toInt(); } }
3.上传参数数据POST请求
int NormalPostRequest(QString paramer1, QString paramer2) { //生成对应的网址请求 QNetworkRequest request; QString scheme = "http"; QString serverAddr = "192.168.0.1"; QString port = "80"; QString requestHeader = scheme + QString("://") + serverAddr + QString(":") + port; QString fullRequest = requestHeader + "/api/v1/user/postrequest"; request.setUrl(QUrl(fullRequest)); request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded"); //获取对应的参数数据 QByteArray data; data.append("paramer1="); data.append(paramer1.toUtf8()); data.append("¶mer2="); data.append(paramer2.toUtf8()); //发送请求 QNetworkAccessManager manager; QNetworkReply *reply = manager.post(request,data); QEventLoop eventLoop; QObject::connect(reply, SIGNAL(finished()),&eventLoop, SLOT(quit())); eventLoop.exec(QEventLoop::ExcludeUserInputEvents); if(reply->error() != QNetworkReply::NoError) { return reply->error(); } //解析返回的Json结果 QByteArray replyData = reply->readAll(); QJsonParseError json_error; QJsonDocument jsonDoc(QJsonDocument::fromJson(replyData, &json_error)); if(json_error.error != QJsonParseError::NoError) { return -1; } QJsonObject rootObj = jsonDoc.object(); QString codeStr = rootObj.value("code").toString(); if (codeStr.compare("200") == 0) { //返回代码为200的时候证明请求成功对包含的结构数据进行处理 if(rootObj.contains("result")) { } return 0; } else { //请求失败对对应的处理 return codeStr.toInt(); } }
4.上传参数和文件POST请求
int PostRequestWithFile(QString paramer1, QString paramer2,QString filePath) { //生成对应的网址请求 QFileInfo fileInfo(filePath); QString fileName =fileInfo.fileName(); QFile* inputFile = new QFile(filePath); inputFile->open(QIODevice::ReadOnly); //multipart请求 QHttpMultiPart* multiPart = new QHttpMultiPart(QHttpMultiPart::FormDataType); //文件块 QHttpPart filePart; filePart.setHeader(QNetworkRequest::ContentDispositionHeader, QVariant(QString("form-data; name=\"uploadfile\";filename=\"%1\"").arg(fileName))); filePart.setBodyDevice(inputFile); inputFile->setParent(multiPart); multiPart->append(filePart); QHttpPart paramer1Part; paramer1Part.setHeader(QNetworkRequest::ContentDispositionHeader,QVariant("form-data; name=\"paramer1\"")); paramer1Part.setBody(paramer1.toUtf8()); multiPart->append(paramer1Part); QHttpPart paramer2Part; paramer2Part.setHeader(QNetworkRequest::ContentDispositionHeader,QVariant("form-data; name=\"paramer2\"")); paramer2Part.setBody(paramer2.toUtf8()); multiPart->append(paramer2Part); //生成对应的网址请求 QNetworkRequest request; QString scheme = "http"; QString serverAddr = "192.168.0.1"; QString port = "80"; QString requestHeader = scheme + QString("://") + serverAddr + QString(":") + port; QString fullRequest = requestHeader + "/api/v1/user/postrequestwithfile"; request.setUrl(QUrl(fullRequest)); //发送请求 QNetworkAccessManager manager; QNetworkReply *reply = manager.post(request,multiPart); multiPart->setParent(reply); QEventLoop eventLoop; QObject::connect(&manager, SIGNAL(finished(QNetworkReply*)),&eventLoop, SLOT(quit())); eventLoop.exec(QEventLoop::ExcludeUserInputEvents); if(reply->error() != QNetworkReply::NoError) { return reply->error(); } //解析返回的Json结果 QByteArray replyData = reply->readAll(); QJsonParseError json_error; QJsonDocument jsonDoc(QJsonDocument::fromJson(replyData, &json_error)); if(json_error.error != QJsonParseError::NoError) { return -1; } QJsonObject rootObj = jsonDoc.object(); QString codeStr = rootObj.value("code").toString(); if (codeStr.compare("200") == 0) { //返回代码为200的时候证明请求成功对包含的结构数据进行处理 if(rootObj.contains("result")) { } return 0; } else { //请求失败对对应的处理 return codeStr.toInt(); } }
5.下载文件GET请求
int DownloadFileFromWeb(QString fileUrl,QString&fileSavePath) { QNetworkRequest request; QUrl url(fileUrl); QFileInfo fileInfo(url.path()); QString fileName = fileInfo.fileName(); QNetworkAccessManager *accessManager=new QNetworkAccessManager(); request.setUrl(url); QNetworkReply *reply = accessManager->get(request); QEventLoop loop; QObject::connect(accessManager, SIGNAL(finished(QNetworkReply*)), &loop, SLOT(quit())); //如果需要下载进度需要关联对应的信号 //connect(reply, SIGNAL(downloadProgress(qint64, qint64)), this, SLOT(LoadProgress(qint64, qint64))); loop.exec(QEventLoop::ExcludeUserInputEvents); //获取下载返回值 QVariant statusCode = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute); if (statusCode.toInt() != 200) { return -1; } //保存下载的文件 QFile file(fileSavePath); if(!file.open(QIODevice::WriteOnly)) { return -2; } file.write(reply->readAll()); file.close(); return 0; }
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