核心代码如下:

1 QNetworkAccessManager* m_manager = new QNetworkAccessManager; 
2 QNetworkRequest request; request.setUrl(QUrl(QString("http://wthrcdn.etouch.cn/weather_mini?city="))); 
3 m_manager->get(request);//向网页发起get请求 
4 connect(m_manager, SIGNAL(finished(QNetworkReply*)), this,SLOT(dealMsg(QNetworkReply*)));//请求完成,获取数据并在槽函数中进行处理

 1 void weather::dealMsg(QNetworkReply * reply)//对数据进行解析
 2 {
 3     QByteArray array = reply->readAll();
 4     QJsonParseError error;
 5     QJsonDocument data = QJsonDocument::fromJson(array, &error);
 6     if (!data.isNull()) {
 7         QJsonObject obj = data.object();
 8         if (obj.contains("data")) {
 9             QJsonValue val = obj.value("data");
10                 ......
11     }
12     reply->deleteLater();
13 }