利用QJSON生成複雜的jSON檔案例子，自己摸索了一下，總結如下： 
先看例子吧：

{
    "first fruit":
    {
        "describe":"an apple",
        "icon":"appleIcon",
        "name":"apple"
    },
    "second fruit":
    {
        "describe":"an orange",
        "icon":"orangeIcon",
        "name":"orange"
    },
    "three fruit array":
    [
        "eat 0",
        "eat 1",
        "eat 2",
        "eat 3",
        "eat 4"
    ]
}
生成這樣一個JSON檔案，需要新增標頭檔案：

#include <QJsonObject>
#include <QJsonDocument>
#include <QByteArray>
#include <QFile>
#include <QDebug>

QVariantHash data;

QVariantHash subData1;
subData1.insert("name", "apple");
subData1.insert("icon", "appleIcon");
subData1.insert("describe", "an apple");

data.insert("first fruit", subData1);

QVariantHash subData2;
subData2.insert("name", "orange");
subData2.insert("icon", "orangeIcon");

 subData2.insert("describe", "an orange");
 data.insert("second fruit", subData2);

 QJsonArray array1;
 for (int i = 0; i < 5;i++)
 {
     array1.insert(i, QString::fromLocal8Bit("eat %1").arg(i));
 }

data.insert("three fruit array", array1);

QJsonObject rootObj = QJsonObject::fromVariantHash(data);
QJsonDocument document;
document.setObject(rootObj);

QByteArray byte_array = document.toJson(QJsonDocument::Compact);
QString json_str(byte_array);
//根據實際填寫路徑
QFile file("D:\\1.json");

if(!file.open(QIODevice::ReadWrite|QIODevice::Text)){
    qDebug() << "file error!";
}

QTextStream in(&file);
in << json_str;

file.close();   // 關閉file
--------------------- 
作者：hp_cpp 
來源：CSDN 
原文：https://blog.csdn.net/hp_cpp/article/details/80208116 
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