Qt 天气预报

通过调用天气服务器接口来获取天气信息，随后对获取到的json格式信息进行提取和转换

这里给出一个获取天气服务器的接口：http://wthrcdn.etouch.cn/weather_mini?city=

运行结果如下：

获取信息功能实现：

weather.cpp:

#include "weather.h" Weather::Weather(QObject *parent) : QObject(parent) { manager = new QNetworkAccessManager(this); //新建QNetworkAccessManager对象 connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinished(QNetworkReply*)));//关联信号和槽 } Weather::Weather(QString cityName) { manager = new QNetworkAccessManager(this); //新建QNetworkAccessManager对象 connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinished(QNetworkReply*)));//关联信号和槽 this->CityName=cityName; refresh(); } void Weather::refresh() { this->TemperMax.clear(); this->currentTemper.clear(); this->Wind.clear(); this->WeatherType.clear(); this->Fever.clear(); this->allInfo.clear(); queryWeather(); dataMap.clear();//刷新的清空，待获取时在加载 } void Weather::queryWeather() { char request[256]="http://wthrcdn.etouch.cn/weather_mini?city="; //"http://wthrcdn.etouch.cn/weather_mini?city="为天气服务器接口 QNetworkRequest quest; sprintf(request,"%s%s",request,CityName.toUtf8().data()); quest.setUrl(QUrl(request)); quest.setHeader(QNetworkRequest::UserAgentHeader,"RT-Thread ART"); manager->get(quest); } //Json文件 例：合肥 //QJsonDocument({"data":{"city":"合肥", // "forecast":[{"date":"27日星期四","fengli":"<![CDATA[2级]]>", // "fengxiang":"西北风","high":"高温 29℃","low":"低温 21℃","type":"多云"}, // {"date":"28日星期五","fengli":"<![CDATA[2级]]>","fengxiang":"北风","high":"高温 30℃","low":"低温 21℃","type":"多云"} // ,{"date":"29日星期六","fengli":"<![CDATA[2级]]>","fengxiang":"东北风","high":"高温 32℃","low":"低温 24℃","type":"多云"}, // {"date":"30日星期天","fengli":"<![CDATA[2级]]>","fengxiang":"东北风","high":"高温 31℃","low":"低温 23℃","type":"小雨"}, // {"date":"31日星期一","fengli":"<![CDATA[2级]]>","fengxiang":"东北风","high":"高温 29℃","low":"低温 22℃","type":"小雨"}], // "ganmao":"感冒低发期，天气舒适，请注意多吃蔬菜水果，多喝水哦。","wendu":"25","yesterday":{"date":"26日星期三", // "fl":"<![CDATA[3级]]>","fx":"西北风","high":"高温 30℃","low":"低温 24℃","type":"中雨"}},"desc":"OK","status":1000}) QMap<QString, QMap<QString, QString> > Weather::getDataMap(bool *ok) { bool Oktemp; if(ok==nullptr) { ok=&Oktemp; } if(!this->dataMap.isEmpty()) { *ok=true; return this->dataMap; } *ok=false; if(!this->isGetData) //是否成功获取数据 return this->dataMap; QJsonParseError err; QJsonDocument json_recv=QJsonDocument::fromJson(allInfo.toUtf8(),&err); //解析json对象 if(!json_recv.isNull()) { QJsonObject object=json_recv.object(); if(object.contains("data")) { QJsonValue value=object.value("data"); //获取指定key对应的value if(value.isObject()) { QJsonObject object_data=value.toObject(); if(object_data.contains("yesterday")&&object_data.contains("forecast")) //若存在昨日或与预测天气则加载所有数据 { QJsonValue value=object_data.value("yesterday"); if(value.isObject()) { QMap<QString,QString>mapvalue; mapvalue["high"]=value.toObject().value("high").toString(); mapvalue["low"]=value.toObject().value("low").toString(); mapvalue["fengxiang"]=value.toObject().value("fx").toString(); mapvalue["fengli"]=value.toObject().value("fl").toString(); mapvalue["type"]=value.toObject().value("type").toString(); dataMap[value.toObject().value("date").toString()]=mapvalue; } value=object_data.value("forecast"); if(value.isArray()) { QJsonArray valueArray=value.toArray(); for(int i=0;i<valueArray.count();i++) { QJsonObject object=valueArray.at(i).toObject(); QMap<QString,QString>mapvalue; mapvalue["high"]=object.value("high").toString(); mapvalue["low"]=object.value("low").toString(); mapvalue["fengxiang"]=object.value("fengxiang").toString(); mapvalue["fengli"]=object.value("fengli").toString(); mapvalue["type"]=object.value("type").toString(); dataMap[object.value("date").toString()]=mapvalue; } *ok=true; return dataMap; } } } } } return dataMap; } void Weather::replyFinished(QNetworkReply *reply) //刷新的槽 { this->isGetData=false; allInfo=reply->readAll(); QJsonParseError err; QJsonDocument json_recv=QJsonDocument::fromJson(allInfo.toUtf8(),&err); //解析json对象 if(!json_recv.isNull()) { QJsonObject object=json_recv.object(); if(object.contains("data")) { QJsonValue value=object.value("data"); //获取指定key对应的value if(value.isObject()) { QJsonObject object_data=value.toObject(); this->CityName=object_data.value("city").toString(); this->currentTemper=object_data.value("wendu").toString(); this->Fever=object_data.value("ganmao").toString(); if(object_data.contains("forecast")) { QJsonValue value=object_data.value("forecast"); if(value.isArray()) { QJsonObject today_weather=value.toArray().at(0).toObject(); WeatherType=today_weather.value("type").toString(); currentDate=today_weather.value("date").toString(); QString low=today_weather.value("low").toString(); QString high=today_weather.value("high").toString(); TemperMax=low.mid(low.length()-3,4)+"-"+high.mid(high.length()-3,4); QString windStrength=today_weather.value("fengli").toString(); windStrength.remove(0,8); windStrength.remove(windStrength.length()-2,2); Wind=today_weather.value("fengxiang").toString()+windStrength; this->isGetData=true; } } } } } reply->deleteLater(); if(isGetData) { emit this->getDataSuccessedSignal(); } else { emit this->getDataFailedSignal(); } emit this->getDataFinisedSignal(); } QString Weather::getAllInfo() { return this->allInfo; } void Weather::setCityName(QString city) { this->CityName=city; } QString Weather::GetCityName() { return this->CityName; } QString Weather::GetDate() { return this->currentDate; } QString Weather::GetTemperature() { return this->currentTemper; } QString Weather::GetTemperatureMax() { return this->TemperMax; } QString Weather::GetWind() { return this->Wind; } QString Weather::GetFluenza() { return this->Fever; } QString Weather::GetWeatherType() { return this->WeatherType; }

weather.h:

#ifndef WEATHER_H #define WEATHER_H #include<QObject> #include<QNetworkAccessManager> #include<QNetworkReply> #include<QNetworkRequest> #include<QJsonDocument> #include<QJsonArray> #include<QJsonObject> class Weather : public QObject { Q_OBJECT public: explicit Weather(QObject *parent = nullptr); explicit Weather(QString cityName = ""); public: void refresh(); void setCityName(QString city); QString GetCityName(); //获取城市 QString GetDate(); //获取时间 QString GetTemperature(); //获取当前温度 QString GetTemperatureMax(); //获取温度范围 QString GetWind(); //获取风向 QString GetWeatherType(); //获取天气类型 QString GetFluenza(); //获取感冒提醒 QString getAllInfo(); //获取原始的所有字段 void queryWeather(); QMap<QString, QMap<QString, QString> > getDataMap(bool *ok=nullptr); //获取昨天以及未来5天的天气预测 private: QNetworkAccessManager *manager; QString allInfo; QString CityName; QString currentDate; QString currentTemper; QString TemperMax; QString Wind; QString WeatherType; QString Fever; bool isGetData=false;//是否成功获取数据 QMap<QString,QMap<QString,QString>> dataMap; public slots: void replyFinished(QNetworkReply *reply);//刷新的槽 signals: void getDataFinisedSignal();//获取数据结束的信号 void getDataSuccessedSignal();//获取数据成功的信号 void getDataFailedSignal();//获取数据失败的信号 }; #endif // WEATHER_H

源码：

https://download.csdn.net/download/NuvoleWalker/12806563