qt create Linux实现一个http协议多线程请求代理类，举例

好的！首先，我们需要使用Qt的网络模块实现HTTP请求。代码如下：

QNetworkAccessManager *manager = new QNetworkAccessManager(this);
QNetworkRequest request;
request.setUrl(QUrl("http://www.example.com"));
QNetworkReply *reply = manager->get(request);
connect(reply, &QNetworkReply::finished, [=]() {
    if (reply->error() == QNetworkReply::NoError) {
        QString data = QString::fromUtf8(reply->readAll());
        qDebug() << data;
    } else {
        qDebug() << reply->errorString();
    }
    reply->deleteLater();
});

接着，我们可以将以上代码封装成一个多线程的HTTP请求类，代码如下：

class HttpThread : public QThread
{
    Q_OBJECT
public:
    HttpThread(const QUrl &url, QObject *parent = nullptr)
        : QThread(parent), m_url(url)
    {}

signals:
    void finished(const QString &response);

protected:
    void run() override {
        QNetworkAccessManager *manager = new QNetworkAccessManager();
        QNetworkRequest request;
        request.setUrl(m_url);
        QNetworkReply *reply = manager->get(request);
        connect(reply, &QNetworkReply::finished, [=]() {
            if (reply->error() == QNetworkReply::NoError) {
                QString data = QString::fromUtf8(reply->readAll());
                emit finished(data);
            } else {
                emit finished(reply->errorString());
            }
            reply->deleteLater();
            manager->deleteLater();
        });
        exec();
    }

private:
    QUrl m_url;
};

最后，我们可以将以上代码再次封装成一个HTTP请求代理类，代码如下：

class HttpProxy : public QObject
{
    Q_OBJECT
public:
    HttpProxy(QObject *parent = nullptr)
        : QObject(parent)
    {}

    void sendRequest(const QUrl &url) {
        HttpThread *thread = new HttpThread(url, this);
        connect(thread, &HttpThread::finished, [=](const QString &response) {
            emit finished(response);
            thread->deleteLater();
        });
        thread->start();
    }

signals:
    void finished(const QString &response);
};

使用时，我们只需要创建一个HttpProxy对象，调用sendRequest方法即可。

HttpProxy *proxy = new HttpProxy(this);
connect(proxy, &HttpProxy::finished, [=](const QString &response) {
    qDebug() << response;
});
proxy->sendRequest(QUrl("http://www.example.com"));

这就是一个简单的基于Qt的HTTP请求代理类的实现。