QThttp程序

#ifndef WIDGET_H
#define WIDGET_H

#include
#include
#include
#include
#include

QT_BEGIN_NAMESPACE
namespace Ui { class Widget; }
QT_END_NAMESPACE

class Widget : public QWidget
{
    Q_OBJECT

public:
    Widget(QWidget *parent = nullptr);
    ~Widget();

    QNetworkAccessManager *manager;

private:
    Ui::Widget *ui;

private slots:
    void on_pushButton_clicked();
    void GetFinished(QNetworkReply *reply);

};
#endif // WIDGET_H

----------------------------------------------

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    ui->lineEdit->setText("http://www.baidu.com/");

    //建立新对象
    manager = new QNetworkAccessManager(this);

    //连接槽
    connect(manager,&QNetworkAccessManager::finished,this,&Widget::GetFinished);
}

Widget::~Widget()
{
    delete ui;
}

void Widget::on_pushButton_clicked()
{
    QString url = ui->lineEdit->text();
    manager->get(QNetworkRequest(QUrl(url)));
}

void Widget::GetFinished(QNetworkReply *reply)
{
    //转换为utf-8编码，这样就可以显示中文了
    QTextCodec *codec = QTextCodec::codecForName("utf8");
    QString getData = codec->toUnicode(reply->readAll());

    ui->textEdit->setText(getData);
}