#include <QCoreApplication> #include <QJsonArray> #include <QJsonDocument> #include <QJsonObject> #include <QJsonParseError> #include <QFile> #include <QDateTime> int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QFile file("F:/1.json"); if (file.open(QFile::ReadWrite)) { QByteArray data=file.readAll(); file.resize(0);//clear QJsonParseError jsError; QJsonDocument jsDoc(QJsonDocument::fromJson(data,&jsError)); QJsonObject rootObj=jsDoc.object(); QJsonObject subObj;//Map key:value subObj.insert("Name","Tom"); subObj.insert("Age",18); subObj.insert("Birth",QDateTime::currentDateTime().toString()); rootObj.insert("Tom",subObj); QJsonArray subArr;//List value subArr.append("Jerry"); subArr.append(18); subArr.append(QDateTime::currentDateTime().toString()); rootObj.insert("Jerry",subArr); jsDoc.setObject(rootObj); file.write(jsDoc.toJson()); file.close(); } return a.exec(); }
Before:
{ "Conan": { "Age": 10, "Birth": "周四 五月 16 09:43:58 2019", "Name": "Conan" }, "Pika": { "Age": 12, "Birth": "周四 五月 16 09:43:58 2019", "Name": "Pika" } }
After:
{ "Conan": { "Age": 10, "Birth": "周四 五月 16 09:43:58 2019", "Name": "Conan" }, "Jerry": [ "Jerry", 18, "周四 五月 16 09:49:46 2019" ], "Pika": { "Age": 12, "Birth": "周四 五月 16 09:43:58 2019", "Name": "Pika" }, "Tom": { "Age": 18, "Birth": "周四 五月 16 09:49:46 2019", "Name": "Tom" } }
- Object默认字典序,Array按添加顺序;
- Object包含(key,value),Array包含(value);
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