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 
#include 
#include 
#include 
#include 
std::shared_ptr NetworkManager::_instPtr{nullptr};
std::mutex NetworkManager::mutex_;
//单例模式
std::shared_ptr NetworkManager::getSingletonPtr() {
	if (!_instPtr) {
		std::lock_guard gLock(mutex_);
		if (_instPtr == nullptr) {
			_instPtr.reset(new NetworkManager, [](NetworkManager* inst) {delete inst; });
		}
	}
	return _instPtr;
}

NetworkManager::NetworkManager(QObject* parent) {
	netAccessMgr_ = std::make_shared();
}

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/json
	if (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/json
	if (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url
	QString 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 
#include 
#include 
#include 
#include 
#include 
#include 

// 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_OBJECT

public:
	static std::shared_ptr 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 _instPtr;
	static std::mutex mutex_;
	std::shared_ptr netAccessMgr_;
	QNetworkAccessManager* netAccessMgr_tt;
};

#endif // !NETWORK_MANAGER_H