如何在Qt5中创建/读取/写入JSon文件

示例：从文件读取json

{   "appDesc": {      "description": "SomeDescription",      "message": "SomeMessage"   },   "appName": {      "description": "Home",      "message": "Welcome",      "imp":["awesome","best","good"]   }}void readJson()   {      QString val;      QFile file;      file.setFileName("test.json");      file.open(QIODevice::Readonly | QIODevice::Text);      val = file.readAll();      file.close();      qWarning() << val;      QJsondocument d = QJsondocument::fromJson(val.toUtf8());      QJsonObject sett2 = d.object();      QJsonValue value = sett2.value(QString("appName"));      qWarning() << value;      QJsonObject item = value.toObject();      qWarning() << tr("QJsonObject of description: ") << item;            qWarning() << tr("QJsonObject[appName] of description: ") << item["description"];      QJsonValue subobj = item["description"];      qWarning() << subobj.toString();            qWarning() << tr("QJsonObject[appName] of value: ") << item["imp"];      QJsonArray test = item["imp"].toArray();      qWarning() << test[1].toString();   }

输出值

QJsonValue(object, QJsonObject({"description": "Home","imp": ["awesome","best","good"],"message": "YouTube"}) ) "QJsonObject of description: " QJsonObject({"description": "Home","imp": ["awesome","best","good"],"message": "YouTube"}) "QJsonObject[appName] of description: " QJsonValue(string, "Home") "Home" "QJsonObject[appName] of value: " QJsonValue(array, QJsonArray(["awesome","best","good"]) ) "best"

示例：从字符串读取json

将json分配给字符串，如下所示，并使用

readJson()

val =   '  {       "appDesc": {          "description": "SomeDescription",          "message": "SomeMessage"       },       "appName": {          "description": "Home",          "message": "Welcome",          "imp":["awesome","best","good"]       }    }';

输出值

QJsonValue(object, QJsonObject({"description": "Home","imp": ["awesome","best","good"],"message": "YouTube"}) ) "QJsonObject of description: " QJsonObject({"description": "Home","imp": ["awesome","best","good"],"message": "YouTube"}) "QJsonObject[appName] of description: " QJsonValue(string, "Home") "Home" "QJsonObject[appName] of value: " QJsonValue(array, QJsonArray(["awesome","best","good"]) ) "best"