QT json - QTCN开发网 - Powered by phpwind

#include <QCoreApplication>

#include <QFile>
#include <QTextStream>
#include <QJsonArray>
#include <QJsonDocument>
#include <QJsonObject>
#include <QDebug>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
{
    QVariantList people;

    QVariantMap bob;
    bob.insert("Name", "Bob");
    bob.insert("Phonenumber", 123);

    QVariantMap alice;
    alice.insert("Name", "Alice");
    alice.insert("Phonenumber", 321);

    people << bob << alice;

    QJsonDocument jsonDocument = QJsonDocument::fromVariant(people);

    QByteArray byte_array = jsonDocument.toJson();

    QFile file("./test1.js");
    file.open(QIODevice::WriteOnly);
    QTextStream stream(&file);
    stream << byte_array << "\r\n";
    file.flush();
    file.close();

    QJsonParseError ParseError;
    QJsonDocument praseDoc = QJsonDocument::fromJson(byte_array,&ParseError);

    if(ParseError.error == QJsonParseError::NoError)
    {
        if(praseDoc.isArray())
        {
            QJsonArray array = praseDoc.array();

            for(int i = 0 ; i <  array.size(); i++)
            {
                QVariantMap result = array.at(i).toVariant().toMap();

                for(QVariantMap::iterator iter = result.begin();iter != result.end();iter++)
                {
                    QString key = iter.key();
                    QVariant value = iter.value();

                    qDebug()<<key<<value.toString();
                }
            }
            qDebug()<<"/////////////other method/////////////";
            for(int i = 0 ; i <  array.size(); i++)
            {
                QJsonObject obj = array.at(i).toObject();

                qDebug()<<obj.value("Name").toString()<<obj.value("Phonenumber").toInt();
            }

        }
    }
}
qDebug()<<"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@";
{
    QJsonObject json_object1;
    json_object1.insert("ID",        "1263");
    json_object1.insert("Name",      "lin");
    json_object1.insert("age",       20);

    QJsonObject json_object2;
    json_object2.insert("ID",      "2345");
    json_object2.insert("Name",      "jin");
    json_object2.insert("age",       5);

    QJsonArray json_array;

    json_array.insert(0,json_object1);
    json_array.insert(1,json_object2);

    QByteArray byte_array = QJsonDocument(json_array).toJson();

    QJsonArray json_array2 = QJsonDocument::fromJson(byte_array).array();

    for(int i = 0; i < json_array2.size(); ++i)
    {
        QJsonObject json = json_array2.at(i).toObject();
        qDebug() << json.value("ID").toString();
        qDebug() << json.value("Name").toString();
        qDebug() << json.value("age").toInt();
    }

    QFile file("./test2.js");
    file.open(QIODevice::WriteOnly);
    QTextStream stream(&file);
    stream <<byte_array<<"\r\n";
    file.flush();
    file.close();
}
qDebug()<<"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@";
{
    QString json("{"
            "\"encoding\" : \"UTF-8\","
            "\"plug-ins\" : ["
            "\"python\","
            "\"c++\","
            "\"ruby\""
            "],"
            "\"indent\" : { \"length\" : 3, \"use_space\" : true }"
            "}");
    QJsonParseError error;
    QJsonDocument jsonDocument = QJsonDocument::fromJson(json.toUtf8(), &error);
    if (error.error == QJsonParseError::NoError)
    {
        if (jsonDocument.isObject())
        {
            QVariantMap result = jsonDocument.toVariant().toMap();
            qDebug() << "encoding:" << result["encoding"].toString();
            qDebug() << "plugins:";

            foreach (QVariant plugin, result["plug-ins"].toList()) {
                qDebug() << "\t-" << plugin.toString();
            }

            QVariantMap nestedMap = result["indent"].toMap();
            qDebug() << "length:" << nestedMap["length"].toInt();
            qDebug() << "use_space:" << nestedMap["use_space"].toBool();
        }
    }

    QByteArray byte_array = jsonDocument.toJson();

    QFile file("./test3.js");
    file.open(QIODevice::WriteOnly);
    QTextStream stream(&file);
    stream << byte_array<<"\r\n";
    file.flush();
    file.close();
}
qDebug()<<"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@";
{

    QJsonObject person;
    person.insert("ID",        "1263");
    person.insert("Name",      "lin");
    person.insert("age",       20);

    QJsonObject company;
    company.insert("Name",     "HH CO.LMT");
    company.insert("Location", "guangzhou");
    company.insert("businss",   "med");

    QJsonObject json_object;
    json_object.insert("person", QJsonValue(person));
    json_object.insert("company", QJsonValue(company));

   QByteArray byte_array =  QJsonDocument(json_object).toJson();

   QJsonParseError ParseError;
   QJsonDocument praseDoc = QJsonDocument::fromJson(byte_array,&ParseError);

   if(ParseError.error == QJsonParseError::NoError)
   {
       if(praseDoc.isObject())
       {
            QJsonObject objs = praseDoc.object();

            QVariantMap result = objs.value("company").toVariant().toMap();

            qDebug()<< result["Location"].toString();
            qDebug()<< result["Name"].toString();
            qDebug()<< result["businss"].toString();

            result = objs.value("person").toVariant().toMap();

            qDebug()<< result["ID"].toString();
            qDebug()<< result["Name"].toString();
            qDebug()<< result["age"].toString();
       }
   }

   QFile file("./test4.js");
   file.open(QIODevice::WriteOnly);
   QTextStream stream(&file);
   stream << byte_array<<"\r\n";
   file.flush();
   file.close();
}

    return a.exec();
}