QT 5.15向服务器发送POST请求，接收并解析服务器的响应数据（嵌套解析JSON数据）

服务器发送POST请求，接收并解析服务器的响应数据（嵌套解析JSON数据）"/>

QT 5.15向服务器发送POST请求，接收并解析服务器的响应数据（嵌套解析JSON数据）

首先要在.pro文件中加上QT += network。

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include <QMainWindow>
#include <QDebug>
#include <QtNetwork>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QTextCodec>
#include <QFile>
#include <QTextStream>
#include <QDateTime>QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent = nullptr);~MainWindow();void run();void fun();void funBack(QNetworkReply* reply);QString CmdParse(QJsonValue value);private:Ui::MainWindow *ui;private:QNetworkAccessManager *manager;QString data;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QDebug>
#include<QJsonObject>
#include<Windows.h>
#include<QJsonDocument>MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui->setupUi(this);//调用函数发送请求，参数是请求的服务器地址run();}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::run(){fun();}
//请求
void MainWindow::fun(){manager = new QNetworkAccessManager(this);//通信完成后，自动执行funBackconnect(manager,&QNetworkAccessManager::finished,this,&MainWindow::funBack);// Json数据，请求体QJsonObject json;json.insert("xxx", "xxxx");json.insert("xxxx", "xxxxxxxxx");QJsonDocument document;document.setObject(json);QByteArray dataArray = document.toJson(QJsonDocument::Compact);// 构造请求QNetworkRequest request;request.setUrl(QUrl("xxxxx:xxxxxxxx/xxxx/xxx"));//构造请求头request.setRawHeader("User-Agent","xxxx");request.setRawHeader("Content-Type","application/json");request.setRawHeader("Host","xxxxxxxxxxx");request.setRawHeader("Connection", "keep-alive");// 发送请求manager->post(request, dataArray);}
//接收响应
void MainWindow::funBack(QNetworkReply* reply){// 获取响应信息int statusCode  = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();qDebug() << "statusCode:" << statusCode;QByteArray bytes = reply->readAll();//qDebug()<<bytes;QJsonParseError jsonError;QJsonDocument doucment = QJsonDocument::fromJson(bytes, &jsonError);if (jsonError.error != QJsonParseError::NoError) {qDebug() << QStringLiteral("parse Json error!");return;}else qDebug() << QStringLiteral("parse Json success!");// 解析Jsonif (doucment.isObject()){QJsonObject obj = doucment.object();QJsonValue value;if (obj.contains("data")){QJsonValue value = obj.value("data");//嵌套解析json数据data = CmdParse(value);qDebug()<<data;}}}
//嵌套解析json
QString MainWindow::CmdParse(QJsonValue value)
{QString dataValue;  //容器保存json值if (value.isObject())  //判断第二级对象是否存在{QJsonObject obj = value.toObject();//abcxxx是json嵌套里面的if (obj.contains("abcxxx")){QJsonValue value = obj.value("abc");if(value.isString()){dataValue=value.toString();}else{qDebug()<<value.toString();}}}return dataValue;   //返回解析好的json值
}

main.cpp

#include "mainwindow.h"#include <QApplication>int main(int argc, char *argv[])
{QApplication a(argc, argv);MainWindow w;w.show();return a.exec();
}