Qt天气预报系统获取天气数据

1、获取天气数据

1.1添加天气类头文件

鼠标放到项目上， 右键选择Add New...

选择C++，选择C++Header File

起名为weatherData

1.2定义今天和未来几天天气数据类

//今天的数据类
class Today{
public:Today(){city ="广州";     //城市date ="2025-1-10";  //日期weatherType ="多云";     //天气类型highTem = 30;           //最高温lowTem = 18;            //最低温ganMao ="感冒指数";      //感冒指数Temperature = 0;       //温度Humidity = "0%";       //湿度PM25 = 0;              //PM2.5windType ="南风";       //风的类型windPower ="2级";       //风力airQuality ="无数据";    //空气质量}QString city;QString date;int Temperature;QString weatherType;int highTem;int lowTem;QString ganMao;QString Humidity;int PM25;QString windType;QString windPower;QString airQuality;};//未来几天的数据类
class Day{
public:Day(){week ="周五";             //星期date ="2023-7-29";       //日期weatherType ="多云";      //天气类型airQuality = 0; //空气指数，优        //空气质量highTem = 0;              //最高温lowTem = 0;               //最低温windType ="南风";          //风的类型windPower ="2级";         //风力}QString week;QString date;QString weatherType;int airQuality;int highTem;int lowTem;QString windType;QString windPower;
};

1.3定义一个解析JSON数据的函数

void parseJson(QByteArray& byteArray);                  //解析JSON数据

1.4在mainwindow中添加weatherData.h

#include "weatherData.h"

1.5创建今天天气数据和未来几天天气数据对象

Today today;                                //定义一个今天天气数据对象
Day day[7];                                 //定义未来几天天气数据对象

1.6添加parseJson定义

1.7把解析JSON数据添加进去

void MainWindow::readHttpReply(QNetworkReply *reply)
{int status_code = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();   //状态码//请求错误if(reply->error() != QNetworkReply::NoError || status_code != 200){qDebug() << reply->errorString().toLatin1().data();     //打印错误信息QMessageBox::warning(this,"天气","请求数据失败", QMessageBox::Ok);      //弹出警告信息框}//请求成功else{QByteArray byteArray = reply->readAll();        //读取服务器数据qDebug() << "read all:"<< byteArray.data();     //打印接收到的数据parseJson(byteArray);                           //解析JSON数据}reply->deleteLater();       //释放对象
}

1.8添加错误

//解析JSON格式天气数据
void MainWindow::parseJson(QByteArray &byteArray)
{//错误QJsonParseError err;
}

鼠标放到QJsonParseError上， ALT+Enter选择添加头文件，后面的也类似，使用一个 新类的时候，记得添加头文件

1.9解析整个天气数据

//解析JSON格式天气数据
void MainWindow::parseJson(QByteArray &byteArray)
{//错误QJsonParseError err;        //创建一个错误对象QJsonDocument doc = QJsonDocument::fromJson(byteArray, &err);   //将JSON格式解析为QJsonDocument对象//如果错误if(err.error != QJsonParseError::NoError){return;    //返回}QJsonObject rootObj = doc.object();     //创建一个QJsonObject对象返回文档//    qDebug() << rootObj.value("message").toString();//1.解析城市和日期today.city = rootObj.value("cityInfo").toObject().value("city").toString();     //城市today.date = rootObj.value("date").toString();                                  //日期//2.解析昨天yesterday数据QJsonObject objData = rootObj.value("data").toObject();         //获取data对象QJsonObject objYesterday = objData.value("yesterday").toObject();          //昨天day[0].week = objYesterday.value("week").toString();                       //星期day[0].date = objYesterday.value("date").toString();                       //日期day[0].weatherType = objYesterday.value("type").toString();                      //天气类型QString highT;          //最高温highT = objYesterday.value("high").toString().split(" ").at(1); //空格分割，取分割后第二个数据，1是第二个，0是第一个day[0].highTem = highT.left(highT.length() - 1).toInt(); //把℃减掉，只剩数字QString lowT;           //最低温lowT = objYesterday.value("low").toString().split(" ").at(1);day[0].lowTem = lowT.left(lowT.length() - 1).toInt();//风的类型，风力day[0].windType = objYesterday.value("fx").toString();      //风的类型   day[0].windPower = objYesterday.value("fl").toString();     //风力//空气指数day[0].airQuality =objYesterday.value("aqi").toDouble();    //空气质量//3.解析未来几天的天气数据QJsonArray forecastArray = objData.value("forecast").toArray();        //获取forecast数组//遍历未来几天天气数据for(int i=0 ; i<6 ; i++){QJsonObject forecastObj = forecastArray[i].toObject();             //获取JSON对象day[i+1].week = forecastObj.value("week").toString();             //星期day[i+1].date = forecastObj.value("ymd").toString();              //日期day[i+1].weatherType = forecastObj.value("type").toString();      //天气类型//空气指数day[i+1].airQuality =forecastObj.value("aqi").toDouble();         //空气质量QString highT;      //最高温highT = forecastObj.value("high").toString().split(" ").at(1);      //空格分割，取分割后第二个数据，1是第二个，0是第一个day[i+1].highTem = highT.left(highT.length() - 1).toInt();          //把℃减掉，只剩数字QString lowS;       //最低温lowS = forecastObj.value("low").toString().split(" ").at(1);day[i+1].lowTem = lowS.left(lowS.length() - 1).toInt();//风的类型，风力day[i+1].windType = forecastObj.value("fx").toString();           //风的类型day[i+1].windPower = forecastObj.value("fl").toString();          //风力//4、解析今天的数据today.Temperature =objData.value("wendu").toInt();                 //温度today.ganMao =objData.value("ganmao").toString();                  //感冒指数today.Humidity = objData.value("shidu").toString();                //湿度today.PM25 = objData.value("pm25").toDouble();                        //PM2.5today.airQuality = objData.value("quality").toString();            //空气质量//forecast里面也有今天的数据today.weatherType = day[1].weatherType;                            //天气类型today.highTem = day[1].highTem;                                    //最高温today.lowTem = day[1].lowTem;                                      //最低温today.windType = day[1].windType;                                  //风的类型today.windPower = day[1].windPower;                                //风力}  
}

2、.h文件和.cpp文件

2.1 mainwindow.h文件

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QMenu>
#include <QMessageBox>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include "weatherData.h"QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();protected:void mousePressEvent(QMouseEvent *event) override;      //重写鼠标点击事件函数void mouseMoveEvent(QMouseEvent *event) override;       //重写鼠标移动事件函数void getWeatherInfo(QString citycode);                  //获取天气数据void parseJson(QByteArray& byteArray);                  //解析JSON数据private slots:void on_pushButton_quit_clicked();          //关闭UI界面void onQuitActTriggered();                  //菜单被点击后的处理public slots:void readHttpReply(QNetworkReply *reply);                       //新建一个网络请求获取的槽函数private:Ui::MainWindow *ui;QMenu *quitMenu;                            //创建一个菜单指针QAction *quitAct;                           //定义一个动作QPoint moffset;                             //窗口移动时，鼠标与窗口左上角的偏移值QNetworkAccessManager *NetAccessManger;        //声明一个网络请求对象bool closePOPWindow();                      //关闭窗口的弹窗Today today;                                //定义一个今天天气数据对象Day day[7];                                 //定义未来几天天气数据对象
};
#endif // MAINWINDOW_H

2.2weatherData.h文件

#ifndef WEATHERDATA_H
#define WEATHERDATA_H
#include <QString>
//今天的数据类
class Today{
public:Today(){city ="广州";     //城市date ="2025-1-10";  //日期weatherType ="多云";     //天气类型highTem = 30;           //最高温lowTem = 18;            //最低温ganMao ="感冒指数";      //感冒指数Temperature = 0;       //温度Humidity = "0%";       //湿度PM25 = 0;              //PM2.5windType ="南风";       //风的类型windPower ="2级";       //风力airQuality ="无数据";    //空气质量}QString city;QString date;int Temperature;QString weatherType;int highTem;int lowTem;QString ganMao;QString Humidity;int PM25;QString windType;QString windPower;QString airQuality;};//未来几天的数据类
class Day{
public:Day(){week ="周五";             //星期date ="2023-7-29";       //日期weatherType ="多云";      //天气类型airQuality = 0; //空气指数，优        //空气质量highTem = 0;              //最高温lowTem = 0;               //最低温windType ="南风";          //风的类型windPower ="2级";         //风力}QString week;QString date;QString weatherType;int airQuality;int highTem;int lowTem;QString windType;QString windPower;
};
#endif // WEATHERDATA_H

2.3 .cpp文件

#include "mainwindow.h"
#include "ui_mainwindow.h"#include <QJsonArray>
#include <QJsonObject>
#include <QJsonParseError>
#include <QMouseEvent>
#include "weatherData.h"MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);setWindowFlag(Qt::FramelessWindowHint);//    this->setLayout(ui->gridLayoutGlobal);      //让界面随着窗口变幻大小quitMenu = new QMenu(this);         //创建一个QMenu对象quitAct = new QAction(QIcon(":/widget/quit.png"), tr("退出"), this);     //定义一个退出动作quitMenu->addAction(quitAct);       //添加动作//    connect(quitMenu,&QMenu::triggered,this,[=]{//        this->close();//    });         //连接信号与槽connect(quitMenu,&QMenu::triggered,this,&MainWindow::onQuitActTriggered);   //连接菜单被触发的信号与槽NetAccessManger = new QNetworkAccessManager(this);          //实例化一个网络请求对象connect(NetAccessManger,&QNetworkAccessManager::finished,this,&MainWindow::readHttpReply);  //连接网络请求获取的信号与槽//101010100是北京的城市编码getWeatherInfo("101010100");}MainWindow::~MainWindow()
{delete ui;
}//鼠标点击
void MainWindow::mousePressEvent(QMouseEvent *event)
{//如果右键被按下if(event->button() == Qt::RightButton){quitMenu->exec(QCursor::pos());       //在当前鼠标位置显示菜单}//当前鼠标位置 event->globalPos()//当前窗口位置 this->pos()if(event->button() == Qt::LeftButton){moffset = event->globalPos() - this->pos();}
}//鼠标移动
void MainWindow::mouseMoveEvent(QMouseEvent *event)
{this->move(event->globalPos() - moffset);    //移动窗口
}//弹窗
bool MainWindow::closePOPWindow()
{// 创建一个消息框询问用户是否真的要退出QMessageBox mes;mes.setWindowTitle("关闭窗口");//  mes.setWindowFlags(Qt::Drawer);       //把标题栏去掉mes.setIcon(QMessageBox::Warning);    //设置一个警告图片mes.setText("是否关闭窗口？");          //弹窗文本mes.setStandardButtons(QMessageBox::Ok | QMessageBox::Cancel);     //设置两个按钮mes.setWindowIcon(QIcon(":/widget/dog.png")); // 设置窗口图标mes.setButtonText(QMessageBox::Ok, tr("确定"));               //ok改为确认mes.setButtonText(QMessageBox::Cancel, tr("取消"));           //Cancel改为取消// 显示消息框并等待用户交互int result = mes.exec();// 根据用户的选择执行相应的操作if (result == QMessageBox::Ok) {// 用户选择了确定，关闭主窗口this->close();return true;}// 用户选择了取消，不关闭主窗口else{return false;     // 窗口关闭操作失败}
}//右上角退出
void MainWindow::on_pushButton_quit_clicked()
{closePOPWindow();
}//鼠标右键退出
void MainWindow::onQuitActTriggered()
{closePOPWindow();
}//获取天气数据
void MainWindow::getWeatherInfo(QString citycode)
{QUrl url("http://t.weather.itboy.net/api/weather/city/" + citycode);     //天气数据接口和城市编码NetAccessManger->get(QNetworkRequest(url));                    //发送GET请求，获取数据}//解析JSON格式天气数据
void MainWindow::parseJson(QByteArray &byteArray)
{//错误QJsonParseError err;        //创建一个错误对象QJsonDocument doc = QJsonDocument::fromJson(byteArray, &err);   //将JSON格式解析为QJsonDocument对象//如果错误if(err.error != QJsonParseError::NoError){return;    //返回}QJsonObject rootObj = doc.object();     //创建一个QJsonObject对象返回文档//    qDebug() << rootObj.value("message").toString();//1.解析城市和日期today.city = rootObj.value("cityInfo").toObject().value("city").toString();     //城市today.date = rootObj.value("date").toString();                                  //日期//2.解析昨天yesterday数据QJsonObject objData = rootObj.value("data").toObject();         //获取data对象QJsonObject objYesterday = objData.value("yesterday").toObject();          //昨天day[0].week = objYesterday.value("week").toString();                       //星期day[0].date = objYesterday.value("date").toString();                       //日期day[0].weatherType = objYesterday.value("type").toString();                      //天气类型QString highT;          //最高温highT = objYesterday.value("high").toString().split(" ").at(1); //空格分割，取分割后第二个数据，1是第二个，0是第一个day[0].highTem = highT.left(highT.length() - 1).toInt(); //把℃减掉，只剩数字QString lowT;           //最低温lowT = objYesterday.value("low").toString().split(" ").at(1);day[0].lowTem = lowT.left(lowT.length() - 1).toInt();//风的类型，风力day[0].windType = objYesterday.value("fx").toString();      //风的类型day[0].windPower = objYesterday.value("fl").toString();     //风力//空气指数day[0].airQuality =objYesterday.value("aqi").toDouble();    //空气质量//3.解析未来几天的天气数据QJsonArray forecastArray = objData.value("forecast").toArray();        //获取forecast数组//遍历未来几天天气数据for(int i=0 ; i<6 ; i++){QJsonObject forecastObj = forecastArray[i].toObject();             //获取JSON对象day[i+1].week = forecastObj.value("week").toString();             //星期day[i+1].date = forecastObj.value("ymd").toString();              //日期day[i+1].weatherType = forecastObj.value("type").toString();      //天气类型//空气指数day[i+1].airQuality =forecastObj.value("aqi").toDouble();         //空气质量QString highT;      //最高温highT = forecastObj.value("high").toString().split(" ").at(1);      //空格分割，取分割后第二个数据，1是第二个，0是第一个day[i+1].highTem = highT.left(highT.length() - 1).toInt();          //把℃减掉，只剩数字QString lowS;       //最低温lowS = forecastObj.value("low").toString().split(" ").at(1);day[i+1].lowTem = lowS.left(lowS.length() - 1).toInt();//风的类型，风力day[i+1].windType = forecastObj.value("fx").toString();           //风的类型day[i+1].windPower = forecastObj.value("fl").toString();          //风力//4、解析今天的数据today.Temperature =objData.value("wendu").toInt();                 //温度today.ganMao =objData.value("ganmao").toString();                  //感冒指数today.Humidity = objData.value("shidu").toString();                //湿度today.PM25 = objData.value("pm25").toDouble();                        //PM2.5today.airQuality = objData.value("quality").toString();            //空气质量//forecast里面也有今天的数据today.weatherType = day[1].weatherType;                            //天气类型today.highTem = day[1].highTem;                                    //最高温today.lowTem = day[1].lowTem;                                      //最低温today.windType = day[1].windType;                                  //风的类型today.windPower = day[1].windPower;                                //风力}
}//网络请求获取
void MainWindow::readHttpReply(QNetworkReply *reply)
{int status_code = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();   //状态码//请求错误if(reply->error() != QNetworkReply::NoError || status_code != 200){qDebug() << reply->errorString().toLatin1().data();     //打印错误信息QMessageBox::warning(this,"天气","请求数据失败", QMessageBox::Ok);      //弹出警告信息框}//请求成功else{QByteArray byteArray = reply->readAll();        //读取服务器数据qDebug() << "read all:"<< byteArray.data();     //打印接收到的数据parseJson(byteArray);                           //解析JSON数据}reply->deleteLater();       //释放对象
}

获取天气数据完成！