使用Qt封裝一個發(fā)送http請求通用類

更新時間：2024年12月02日 11:36:32 作者：Lydro

這篇文章主要為大家詳細(xì)介紹了如何使用Qt封裝一個通用類,可以通過QNetworkRequest和QNetworkReply進(jìn)行http請求,感興趣的可以了解一下

需求

Qt 代碼中使用QNetworkRequest、QNetworkReply進(jìn)行http請求，能不能整理成一個通用的方法或者類。

實現(xiàn)

HttpClient類

#include <QObject>  
#include <QNetworkAccessManager>  
#include <QNetworkRequest>  
#include <QNetworkReply>  
#include <QUrl>  
#include <QUrlQuery>  
#include <QByteArray>  
#include <QJsonObject>  
#include <QJsonDocument>  
#include <QDebug>  
#include <QEventLoop>
  
class HttpClient : public QObject  
{  
    Q_OBJECT  
  
public:  
    explicit HttpClient(QObject *parent = nullptr)  
        : QObject(parent), networkManager(new QNetworkAccessManager(this))  
    {  
        connect(networkManager, &QNetworkAccessManager::finished, this, &HttpClient::onReplyFinished);  
    }  
  
    void get(const QUrl &url, const QUrlQuery &query = QUrlQuery())  
    {  
        QUrl fullUrl = url;  
        fullUrl.setQuery(query);  
        QNetworkRequest request(fullUrl);  
        networkManager->get(request);  
        eventLoot->exec();
    }  
  
    void post(const QUrl &url, const QByteArray &data)  
    {  
        QNetworkRequest request(url);  
        request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json");  
        networkManager->post(request, data); 
        eventLoot->exec(); 
    }  
  
signals:  
    void requestFinished(const QByteArray &responseData, QNetworkReply::NetworkError error);  
  
private slots:  
    void onReplyFinished(QNetworkReply *reply)  
    {  
        if (reply->error() == QNetworkReply::NoError) {  
            QByteArray responseData = reply->readAll();  
            emit requestFinished(responseData, QNetworkReply::NoError);  
        } else {  
            emit requestFinished(QByteArray(), reply->error());  
        }  
        reply->deleteLater();  
    }  
  
private:  
    QNetworkAccessManager *networkManager;  
    QEventLoop eventLoop;
};

HttpClient中使用了一個QEventLoop，為了使發(fā)送的事件得到及時的處理，不加這個的話，測試發(fā)現(xiàn)半天都不能調(diào)到onReplyFinished槽函數(shù)中。

使用

#include <QCoreApplication>  
#include <QUrl>  
#include <QUrlQuery>  
#include <QJsonDocument>  
#include <QJsonObject>  
#include <QByteArray>  
#include "HttpClient.h"  
  
int main(int argc, char *argv[])  
{  
    QCoreApplication a(argc, argv);  
  
    HttpClient client;  
  
    // 發(fā)送GET請求  
    QUrl getUrl("https://jsonplaceholder.typicode.com/posts/1");  
    QObject::connect(&client, &HttpClient::requestFinished, [](const QByteArray &responseData, QNetworkReply::NetworkError error) {  
        if (error == QNetworkReply::NoError) {  
            QJsonDocument jsonDoc = QJsonDocument::fromJson(responseData);  
            QJsonObject jsonObj = jsonDoc.object();  
            qDebug() << "GET Response:" << jsonObj;  
        } else {  
            qDebug() << "GET Error:" << error;  
        }  
    });  
    client.get(getUrl);  
  
    // 發(fā)送POST請求  
    QUrl postUrl("https://jsonplaceholder.typicode.com/posts");  
    QJsonObject postData;  
    postData["title"] = "foo";  
    postData["body"] = "bar";  
    postData["userId"] = 1;  
    QByteArray postDataBytes = QJsonDocument(postData).toJson();  
  
    QObject::connect(&client, &HttpClient::requestFinished, [](const QByteArray &responseData, QNetworkReply::NetworkError error) {  
        if (error == QNetworkReply::NoError) {  
            QJsonDocument jsonDoc = QJsonDocument::fromJson(responseData);  
            QJsonObject jsonObj = jsonDoc.object();  
            qDebug() << "POST Response:" << jsonObj;  
        } else {  
            qDebug() << "POST Error:" << error;  
        }  
    });  
    client.post(postUrl, postDataBytes);  
  
    return a.exec();  
}

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