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Qt HTTP 服务器示例：客户端 POST 请求与服务端实现

#C-Cpp #Qt #QtHttpServer #CMake #Http POST

客户端 HTTP POST 请求

假设 http://127.0.0.1:8888/post/ 是一个能够接受 POST 请求的路径，我们想要向它提交一段 JSON 数据。在 Qt 中，可以使用 QNetworkAccessManager 轻松实现：

QCoreApplication app(argc, argv);
QNetworkAccessManager *mgr = new QNetworkAccessManager;
const QUrl url(QStringLiteral("http://127.0.0.1:8888/post/"));
QNetworkRequest request(url);
request.setHeader(QNetworkRequest::ContentTypeHeader, "application/json; charset=utf-8");

QJsonObject obj;
obj["key1"] = "value1";
obj["key2"] = "value2";
QJsonDocument doc(obj);
QByteArray data = doc.toJson();

QNetworkReply *reply = mgr->post(request, data);

QObject::connect(reply, &QNetworkReply::finished, [=](){
    if(reply->error() == QNetworkReply::NoError){
        QString contents = QString::fromUtf8(reply->readAll());
        qDebug() << contents;
    }
    else{
        QString err = reply->errorString();
        qDebug() << err;
    }
    reply->deleteLater();
    mgr->deleteLater();
});

HTTP 服务器实现

对于本地的服务端，我们可以使用 QtHttpServer 模块快速搭建：

QHttpServer http_server;
http_server.route("/", []() {
    return "Hello QtHttpServer";
});

http_server.route("/post/", QHttpServerRequest::Method::POST,
[](const QHttpServerRequest &request)
{
    qDebug() << "received requestBody" << request.body();
    return QJsonObject
    {
        {"message", "finish"}
    };
});

http_server.listen(QHostAddress::Any, 8888);

源码仓库

完整的示例代码（包含客户端与服务端）已开源在 GitHub： qthttpserver-sample-with-client

参考资料