QT——http协议（大华摄像头保活，根据Id获取大华摄像头播放地址rtsp流）

.cpp文件
详情请看代码注释

#include "customize_files/network_manager.h"
#include <QDir>
#include <QCoreApplication>
#include <QEventLoop>
#include <iostream>
#include <QJsonObject>
std::shared_ptr<NetworkManager> NetworkManager::_instPtr{nullptr};
std::mutex NetworkManager::mutex_;
//单例模式
std::shared_ptr<NetworkManager> NetworkManager::getSingletonPtr() {if (!_instPtr) {std::lock_guard<std::mutex> gLock(mutex_);if (_instPtr == nullptr) {_instPtr.reset(new NetworkManager, [](NetworkManager* inst) {delete inst; });}}return _instPtr;
}NetworkManager::NetworkManager(QObject* parent) {netAccessMgr_ = std::make_shared<QNetworkAccessManager>();
}NetworkManager::~NetworkManager() {
}
// path 对应URL，QNetworkAccessManager::Operation operation，http的三种方式pos，put，get，（还有一种，本文没写），QByteArray data对应传递的请求头，或者内容，
void NetworkManager::fetchServerData(QString path, QNetworkAccessManager::Operation operation, QByteArray data, bool sync) {QUrl url(path);QNetworkRequest request(url);QNetworkReply* reply = NULL;//request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");//application/jsonif (operation == QNetworkAccessManager::GetOperation) {reply = netAccessMgr_->get(request);}else if (operation == QNetworkAccessManager::PostOperation) {reply = netAccessMgr_->post(request, data);}else {reply = netAccessMgr_->put(request, data);}if (sync) {// 同步QEventLoop loop;connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));loop.exec();if (reply->error() == QNetworkReply::NoError) {QString strReply = (QString)reply->readAll();QJsonParseError jsonError;QJsonDocument jsonDocument = QJsonDocument::fromJson(strReply.toUtf8(), &jsonError);if (jsonError.error == QJsonParseError::NoError) {emit queryServerSuccessed(reply->url().path(), jsonDocument);}}else {//Failed;QString strReply = (QString)reply->readAll();QJsonParseError jsonError;QJsonDocument jsonDocument = QJsonDocument::fromJson(strReply.toUtf8(), &jsonError);QJsonObject objs = jsonDocument.object();QByteArray byteArray = jsonDocument.toJson(QJsonDocument::Compact);QString strJson(byteArray);emit errorServerSuccessed(reply->url().path(), jsonDocument);}}else{//异步connect(netAccessMgr_.get(), SIGNAL(finished(QNetworkReply*)), this, SLOT(handleAsyncRequestFinished(QNetworkReply*)));}
}
//这个跟上一个一样，直接返回结果
QJsonDocument NetworkManager::receiveHttpData(QString path, QNetworkAccessManager::Operation operation, QByteArray data, bool sync)
{QUrl url(path);QNetworkRequest request(url);QNetworkReply* reply = NULL;request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");//application/jsonif (operation == QNetworkAccessManager::GetOperation) {reply = netAccessMgr_->get(request);}else if (operation == QNetworkAccessManager::PostOperation) {reply = netAccessMgr_->post(request, data);}if (sync) {// 同步QEventLoop loop;connect(reply, SIGNAL(finished()), &loop, SLOT(quit()));loop.exec();if (reply->error() == QNetworkReply::NoError) {QString strReply = (QString)reply->readAll();QJsonParseError jsonError;QJsonDocument jsonDocument = QJsonDocument::fromJson(strReply.toUtf8(), &jsonError);if (jsonError.error == QJsonParseError::NoError) {return jsonDocument;}}}return QJsonDocument();
}
//   设置请求头的方式   使用get
QByteArray NetworkManager::getUrl(QString url, QByteArray data,int type)
{QNetworkAccessManager *m_pHttpMgr = new QNetworkAccessManager();QNetworkRequest requestInfo;requestInfo.setUrl(QUrl(url));requestInfo.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");requestInfo.setRawHeader(QByteArray("X-Subject-Token"), data);        //设置请求头QEventLoop eventLoop;QNetworkReply *reply = m_pHttpMgr->get(requestInfo);;connect(reply, SIGNAL(finished()), &eventLoop, SLOT(quit()));eventLoop.exec();//错误处理if (reply->error() == QNetworkReply::NoError){qDebug() << "request protobufHttp NoError";}else{QVariant statusCodeV = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute);}//请求返回的结果QByteArray responseByte = reply->readAll();return responseByte;
}
//设置请求头和请求内容的方式。使用put
void NetworkManager::keepAliveVideo(QString path, QByteArray data, QString token)
{QNetworkAccessManager *m_pHttpMgr = new QNetworkAccessManager();//设置urlQString url = path;//设置头信息QNetworkRequest requestInfo;requestInfo.setUrl(QUrl(url));requestInfo.setHeader(QNetworkRequest::ContentTypeHeader, QVariant("application/json"));requestInfo.setRawHeader(QByteArray("X-Subject-Token"), data);//发送数据QByteArray qByteHttpData;qByteHttpData.append(QString("{\"token\":  \"%1\"}").arg(token));QNetworkReply *reply = m_pHttpMgr->put(requestInfo, qByteHttpData);QEventLoop eventLoop;connect(reply, SIGNAL(finished()), &eventLoop, SLOT(quit()));eventLoop.exec();      //请求收到的结果QByteArray responseByte = reply->readAll();QString strReply = (QString)reply->readAll();qWarning() << responseByte;qWarning() << strReply;
}void NetworkManager::handleAsyncRequestFinished(QNetworkReply* reply) {if (reply->error() == QNetworkReply::NoError) {QString strReply = (QString)reply->readAll();QJsonParseError jsonError;QJsonDocument jsonDocument = QJsonDocument::fromJson(strReply.toUtf8(), &jsonError);if (jsonError.error == QJsonParseError::NoError) {emit queryServerSuccessed(reply->url().path(), jsonDocument);}}else {//Failed;}
}

.h文件

/**** @brief    Declares the network manager class*/#ifndef NETWORK_MANAGER_H
#define NETWORK_MANAGER_H#include <memory>
#include <mutex>
#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
#include <QJsonDocument>
#include <QJsonParseError>// 线程安全的单例类（懒汉模式）
// 目前支持HTTP协议的GET, POST, 同步, 异步, 返回JSON格式数据
class NetworkManager : public QObject {Q_OBJECTpublic:static std::shared_ptr<NetworkManager> getSingletonPtr();NetworkManager(const NetworkManager&) = delete;NetworkManager& operator=(const NetworkManager&) = delete;void fetchServerData(QString path, QNetworkAccessManager::Operation operation = QNetworkAccessManager::GetOperation, QByteArray data = NULL, bool sync = true);QJsonDocument receiveHttpData(QString path, QNetworkAccessManager::Operation operation = QNetworkAccessManager::GetOperation, QByteArray data = NULL, bool sync = true);QByteArray getUrl(QString path, QByteArray data, int type);void keepAliveVideo(QString path, QByteArray data,QString token);
signals:void queryServerSuccessed(QString path, QJsonDocument& jsonDocument);void errorServerSuccessed(QString path, QJsonDocument& jsonDocument);void hmjqueryServerSuccessed(QString path, QJsonDocument& jsonDocument);void hmjerrorServerSuccessed(QString path, QJsonDocument& jsonDocument);void dataAboveServerSuccessed(QString path,QJsonDocument& jsonDocument);void dataAboveServererror(QString path, QJsonDocument& jsonDocument);
private:explicit NetworkManager(QObject* parent = 0);~NetworkManager();
private slots:void handleAsyncRequestFinished(QNetworkReply* reply);private:static std::shared_ptr<NetworkManager> _instPtr;static std::mutex mutex_;std::shared_ptr<QNetworkAccessManager> netAccessMgr_;QNetworkAccessManager* netAccessMgr_tt;
};#endif // !NETWORK_MANAGER_H

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