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;

}

}

}