#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QScriptEngine>
#include <QtScript>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QJsonDocument>
#include <QScriptValue>
#include <QVariantMap>



namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QNetworkAccessManager *manager;
    void analyseJson();
    QByteArray weather;

private slots:
    void GetWebJsonData(QNetworkReply *);
};

#endif // MAINWINDOW_H
 

</pre><pre name="code" class="cpp">

<pre name="code" class="cpp">#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    manager = new QNetworkAccessManager(this);//http://www.weather.com.cn/data/cityinfo/101190901.html
    connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(GetWebJsonData(QNetworkReply *)));
    manager->get(QNetworkRequest(QUrl("http://www.weather.com.cn/data/sk/101190401.html")));
}
void MainWindow::GetWebJsonData(QNetworkReply *reply)
{
   weather=reply->readAll();
   //qDebug()<<weather;
   analyseJson();
}
void MainWindow::analyseJson()
{
    QJsonParseError err;
    QJsonDocument doc = QJsonDocument::fromJson(weather,&err);
    QJsonObject obj= doc.object().value("weatherinfo").toObject();//object()獲得json最外面一層

    ui->cityEdit->setText(doc.object().value("weatherinfo").toObject().take("city").toString());
    ui->tempEdit->setText(doc.object().value("weatherinfo").toObject().take("temp").toString()+"℃");
    ui->windEdit->setText(doc.object().value("weatherinfo").toObject().take("WD").toString()+doc.object().value("weatherinfo").toObject().take("WS").toString());
    QVariantMap QVM= obj.toVariantMap();
    QVariantMap::iterator it = QVM.begin();
    while(it!=QVM.end())
    {
        ui->textEdit->append(it.key()+"              "+it.value().toString());
        it++;
        qDebug()<<it.key();
    }

}
MainWindow::~MainWindow()
{
    delete ui;
}
 

</pre><pre name="code" class="cpp">