Qt 生成json字符串，并且保存成文件

利用QJSON生成复杂的jSON文件例子，自己摸索了一下，总结如下：
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"
	]
}

生成这样一个JSON文件，需要添加头文件：

#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);
    //根据实际填写路径
    QFile file("D:\\1.json");

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

    file.close();   // 关闭file

参考：https://blog.youkuaiyun.com/li491093957/article/details/52836925