qt json操作

json文件结构形式

{
    "xiao1": [
        {
            "000100": {
                "industryCode": "000100",
                "industryName": "test"
            }
        },
        {
            "000101": {
                "industryCode": "000100",
                "industryName": "test"
            }
        },
        {
            "000103": {
                "industryCode": "000100",
                "industryName": "test"
            }
        }
    ],
    "xiaogdsadg": [
        {
            "12321344": {
                "industryCode": "12321344",
                "industryName": "454555"
            }
        },
        {
            "54545445": {
                "industryCode": "54545445",
                "industryName": "454555"
            }
        },
        {
            "454454654": {
                "industryCode": "454454654",
                "industryName": "454555"
            }
        }
    ]
}

//判断指定项是否在json文件里

bool MainWindow:: isInJson(QString userName,QString rowId)

{

    QString val;

    QFile file;

    file.setFileName("F:\work\qtProjects\untitled11\test123.json");

    file.open(QIODevice::ReadOnly| QIODevice::Text);

    val = file.readAll();

    file.close();

    QJsonDocument doc = QJsonDocument::fromJson(val.toUtf8());

    QJsonObject objTop1 = doc.object();

    QStringList keys = objTop1.keys();

    //用户循环

    for(int i = 0; i < keys.count();i++)

    {

        if(keys.at(i)!= userName)

            continue;

        QJsonArray arrayRows = objTop1.value(keys.at(i)).toArray();

        //行循环

        for(int j =0;j < arrayRows.count();j++)

        {

            QJsonObject objRow = arrayRows.at(j).toObject();

            if(objRow.keys().at(0) == rowId)

            {

                return true;

            }

        }

    }

    return false;

}

//添加收藏

void MainWindow::addJson(QString userName, QString rowId)

{

    if(!isInJson(userName,rowId))

    {

        bool hasUser = false;

        QString val;

        QFile file;

        file.setFileName("F:\work\qtProjects\untitled11\test123.json");

        file.open(QIODevice::ReadOnly| QIODevice::Text);

        val = file.readAll();

        file.close();

        QJsonDocument doc = QJsonDocument::fromJson(val.toUtf8());

        QJsonObject objTop1 = doc.object();

        QStringList keys = objTop1.keys();

        //用户循环

        for(int i = 0; i < keys.count();i++)

        {

            if(keys.at(i) != userName)

                continue;

            QJsonArray arrayRows = objTop1.value(keys.at(i)).toArray();

            QJsonObject addObj;

            QJsonObject addObj1;

            addObj1.insert("industryCode",rowId);

            addObj1.insert("industryName","454555");

            addObj.insert(rowId,addObj1);

            arrayRows.append(addObj);

            objTop1.insert(userName,arrayRows);

            hasUser = true;

            break;

        }

        //该用户还没有添加

        if(!hasUser)

        {

            QJsonArray arrayRows;

            QJsonObject addObj;

            QJsonObject addObj1;

            addObj1.insert("industryCode",rowId);

            addObj1.insert("industryName","444545");

            addObj.insert(rowId,addObj1);

            arrayRows.append(addObj);

            objTop1.insert(userName,arrayRows);

        }

        doc.setObject(objTop1);

        file.setFileName("F:\work\qtProjects\untitled11\test123.json");

        file.open(QIODevice::WriteOnly| QIODevice::Text);

        file.write(doc.toJson());

        file.close();

    }

}

//取消收藏

void MainWindow::removeJson(QString userName, QString rowId)

{

    if(isInJson(userName,rowId))

    {

        QString val;

        QFile file;

        file.setFileName("F:\work\qtProjects\untitled11\test123.json");

        file.open(QIODevice::ReadOnly| QIODevice::Text);

        val = file.readAll();

        file.close();

        QJsonDocument doc = QJsonDocument::fromJson(val.toUtf8());

        QJsonObject objTop1 = doc.object();

        QStringList keys = objTop1.keys();

        //用户循环

        for(int i = 0; i < keys.count();i++)

        {

            if(keys.at(i) != userName)

                continue;

            QJsonArray arrayRows = objTop1.value(keys.at(i)).toArray();

            //行循环

            for(int j =0;j < arrayRows.count();j++)

            {

                QJsonObject objRow = arrayRows.at(j).toObject();

                if(objRow.keys().at(0) == rowId)

                {

                    arrayRows.removeAt(j);

                    objTop1.insert(userName,arrayRows);

                    break;

                }

            }

            doc.setObject(objTop1);

            file.setFileName("F:\work\qtProjects\untitled11\test123.json");

            file.open(QIODevice::WriteOnly| QIODevice::Text);

            file.write(doc.toJson());

            file.close();

            break;

        }

    }

}