Qt实现XML与JSON数据解析全攻略

#include <QCoreApplication>
#include <QFile>
#include <QXmlStreamReader>
#include <QDebug>
 
void parseXML(const QString &filePath) {
    QFile file(filePath);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qDebug() << "Failed to open file:" << filePath;
        return;
    }
 
    QXmlStreamReader reader(&file);
    while (!reader.atEnd()) {
        reader.readNext();
 
        if (reader.isStartElement()) {
            qDebug() << "Start element:" << reader.name().toString();
        } else if (reader.isEndElement()) {
            qDebug() << "End element:" << reader.name().toString();
        } else if (reader.isCharacters() && !reader.isWhitespace()) {
            qDebug() << "Characters:" << reader.text().toString();
        }
    }
 
    if (reader.hasError()) {
        qDebug() << "XML error:" << reader.errorString();
    }
}
 
int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);
 
    parseXML("example.xml");
 
    return a.exec();
}

#include <QCoreApplication>
#include <QFile>
#include <QDomDocument>
#include <QDebug>
 
void parseXMLWithDOM(const QString &filePath) {
    QFile file(filePath);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qDebug() << "Failed to open file:" << filePath;
        return;
    }
 
    QDomDocument doc;
    if (!doc.setContent(&file)) {
        qDebug() << "Failed to parse the file into a DOM tree.";
        return;
    }
 
    QDomElement root = doc.documentElement();
    qDebug() << "Root element:" << root.tagName();
 
    // 遍历子元素...
}
 
int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);
 
    parseXMLWithDOM("example.xml");
 
    return a.exec();
}

#include <QCoreApplication>
#include <QJsonDocument>
#include <QJsonObject>
#include <QDebug>
 
void parseJSON(const QByteArray &jsonStr) {
    QJsonDocument doc = QJsonDocument::fromJson(jsonStr);
    if (doc.isNull()) {
        qDebug() << "Failed to create JSON doc.";
        return;
    }
 
    if (!doc.isObject()) {
        qDebug() << "JSON is not an object.";
        return;
    }
 
    QJsonObject obj = doc.object();
    qDebug() << "Name:" << obj["name"].toString();
    qDebug() << "Age:" << obj["age"].toInt();
}
    
int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);
 
    QByteArray jsonStr = R"({"name": "John", "age": 30})";
    parseJSON(jsonStr);
 
    return a.exec();
}

#include <QCoreApplication>
#include <QJsonDocument>
#include <QJsonObject>
#include <QDebug>
 
void createJSON() {
    QJsonObject obj;
    obj.insert("name", "Jane");
    obj.insert("age", 25);
 
    QJsonDocument doc(obj);
    QByteArray jsonBytes = doc.toJson(QJsonDocument::Indented); // 使用Indented选项使输出更易读
    qDebug() << "Generated JSON:" << jsonBytes;
}
 
int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);
 
    createJSON();
 
    return a.exec();
}