qt json tree 读取json树状结构并显示

{
"root":{
    "sites": [
    { "name":"菜鸟教程" , "url":"www.runoob.com" }, 
    { "name":"google" , "url":"www.google.com" }, 
    { "name":"微博" , "url":"www.weibo.com" }
    ]
}
}

#ifndef JSONTREEWIDGET_H
#define JSONTREEWIDGET_H

#include <QObject>
#include <QWidget>

#include <QJsonParseError>
#include <QJsonObject>
#include <QJsonArray>

#include <QTreeWidget>
#include <QFile>
#include <QtDebug>


class JsonTreeWidget : public QTreeWidget
{
    Q_OBJECT

public:
    explicit JsonTreeWidget(QWidget *parent = Q_NULLPTR);
    void ReadFile(QString filPath); //读json文件用
    void ReadObj(QJsonObject rootJson, QTreeWidgetItem *treeItem);   //递归用

    void IntoValue(QJsonValue rootValue, QTreeWidgetItem *treeItem);
private:
    QTreeWidget * m_TreeWgt;
};

#endif // JSONTREEWIDGET_H

#include "jsontreewidget.h"

JsonTreeWidget::JsonTreeWidget(QWidget *parent):
    QTreeWidget(parent)
{
    m_TreeWgt = this;
}


void JsonTreeWidget::ReadFile(QString filPath)
{
    QFile file(filPath);
    if(!file.open(QIODevice::ReadOnly))  return;

    QByteArray allJson = file.readAll();//全部内容
    QJsonParseError jsonErr;
    QJsonDocument jsonDoc(QJsonDocument::fromJson(allJson,&jsonErr));

    if(jsonErr.error != QJsonParseError::NoError)
    {
        qDebug()<<jsonErr.errorString();
        return ;
    }

    QJsonObject rootobj = jsonDoc.object();
    m_TreeWgt->clear();//清除旧的内容

    //新建顶层结点
    QTreeWidgetItem *top = new QTreeWidgetItem( m_TreeWgt->topLevelItem(0),QStringList (QString("top")) );
    m_TreeWgt->addTopLevelItem(top);

    //递归进去，直到rootobj是个empty object
    ReadObj(rootobj,m_TreeWgt->topLevelItem(0));

}

//第一层专用
void JsonTreeWidget::ReadObj(QJsonObject rootJson,QTreeWidgetItem* treeItem){

    QStringList li = rootJson.keys();//下一层的判断条件


    //不是叶子节点，继续层级递归
    for (int i=0; i < li.size();i++) {
        QJsonValue tempVal = rootJson.value(li.at((i)));

        QString str = li.at(i);
        QTreeWidgetItem *t = new QTreeWidgetItem;
        t->setText(0,str);
        treeItem->addChild(t);

        //递归进去
        IntoValue(tempVal,t);
    }

}



void JsonTreeWidget::IntoValue(QJsonValue rootValue,QTreeWidgetItem* treeItem){

    QStringList li = rootValue.toObject().keys();//下一层的判断条件

    //是叶子节点了
    if(li.isEmpty()){
        QString str;
        QJsonValue qj = rootValue;

        qDebug()<<qj.type();
        //是单个元素
        if(QJsonValue::String == qj.type()){
            str = qj.toString();
            QTreeWidgetItem *t = new QTreeWidgetItem;
            t->setText(0,str);
            treeItem->addChild(t);
        }
        //是数组元素,遍历
        else if(QJsonValue::Array == qj.type())
        {
            QJsonArray var = qj.toArray();
            for (int i=0;i<var.size();i++) {

                IntoValue(var.at(i) , treeItem);
            }
        }
        return;
    }

    //不是叶子节点，继续层级递归
    for (int i=0; i < li.size();i++) {
        QJsonValue tempVal = rootValue.toObject().value(li.at((i)));

        QString str = li.at(i);
        QTreeWidgetItem *t = new QTreeWidgetItem;
        t->setText(0,str);
        treeItem->addChild(t);

        //递归进去
        IntoValue(tempVal,t);
    }
}

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "jsontreewidget.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{
    ui->treeWidget->ReadFile("2.txt");
}