程序運行截圖如下：

文件如下：

源碼如下：

#include <QCoreApplication> #include <QJsonDocument> #include <QJsonArray> #include <QJsonObject> #include <QFile> #include <QDebug> #include <QVector>class Student{ public:int id;QString name;void write(QJsonObject &json) const{json["id"] = id;json["name"] = name;}void read(const QJsonObject &json){if (json.contains("id") && json["id"].isDouble())id = json["id"].toInt();if (json.contains("name") && json["name"].isString())name = json["name"].toString();}friend QDebug operator << (QDebug os, Student stu){os << "(" << stu.id << ", "<< stu.name << ")";return os;}};class MyClass{ public:int id;QVector<Student> students;void read(const QJsonObject &json){if(json.contains("id") && json["id"].isDouble())id = json["id"].toInt();if(json.contains("students") && json["students"].isArray()){QJsonArray array = json["students"].toArray();for(int i = 0; i < array.size(); i++){QJsonObject obj = array[i].toObject();Student student;student.read(obj);this->students.append(student);}}}void write(QJsonObject &json) const{json["id"] = id;QJsonArray array;for(int i = 0; i < students.size(); i++){QJsonObject student;students.at(i).write(student);array.append(student);}json["students"] = array;}friend QDebug operator << (QDebug os, MyClass myClass){os << "(" << endl << myClass.id << ", ";for(int i = 0; i < myClass.students.size(); i++){os << myClass.students.at(i);}os << endl << ")";return os;} };int main(int argc, char *argv[]) {QCoreApplication a(argc, argv);Student s0;s0.id = 1000;s0.name = "朱小明";Student s1;s1.id = 1001;s1.name = "閏土";Student s2;s2.id = 1000;s2.name = "鍋蓋";Student s3;s3.id = 1003;s3.name = "王炸";MyClass myClass;myClass.id = 142203;myClass.students.append(s0);myClass.students.append(s1);myClass.students.append(s2);myClass.students.append(s3);QJsonObject json;myClass.write(json);QJsonDocument saveJson(json);QFile saveJsonFile("save.json");QFile saveBinaryFile("save.dat");if(!saveJsonFile.open(QIODevice::ReadWrite)){qDebug() << "open failed";return 0;}if(!saveBinaryFile.open(QIODevice::ReadWrite)){qDebug() << "open failed";return 0;}saveJsonFile.write(saveJson.toJson());saveJsonFile.close();saveBinaryFile.write(saveJson.toBinaryData());saveBinaryFile.close();qDebug() << "write over";QFile loadFile("save.dat");if(!loadFile.open(QIODevice::ReadOnly)){qDebug() << "open failed";}QByteArray data = loadFile.readAll();QJsonDocument loadDoc(QJsonDocument::fromBinaryData(data));MyClass readClass;readClass.read(loadDoc.object());loadFile.close();qDebug() << "read over";qDebug() << readClass;return a.exec(); }

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