一个简单的treeivew，以表格方式保存比较简单，遍历所有节点，记录parentNode、node、data即可

parentid	data	id
002	xx2	001
005	xx5	000
003	xx3	001
006	xx6	002
007	xx7	001
000	xx0	001
001	xx1	-1
004	xx4	007

如何将表格转为tree数据，代码如下：

#include "mainwindow.h"
#include <QtWidgets>struct DataInfo{QString id;QString name;QString parentId;
};
struct DataNode{DataInfo info;QMap<QString, DataNode> child;
};void print(QMap<QString, DataNode> map)
{for(auto d = map.begin(); d != map.end(); d ++) {auto k = d.value();qDebug() << __LINE__ << d.key() << k.info.name;print(k.child);}
}
void fillTree(QMap<QString, DataNode> map, QStandardItem *item)
{for(auto k = map.begin(); k != map.end(); k ++) {DataNode d = k.value();QStandardItem *itm = new QStandardItem;itm->setText(d.info.name);item->appendRow(itm);fillTree(d.child, itm);}
}int main(int argc, char *argv[])
{QApplication a(argc, argv);QList<DataInfo> infoList;infoList << DataInfo{"002", "xx2", "001"};infoList << DataInfo{"005", "xx5", "000"};infoList << DataInfo{"003", "xx3", "001"};infoList << DataInfo{"006", "xx6", "002"};infoList << DataInfo{"007", "xx7", "001"};infoList << DataInfo{"000", "xx0", "001"};infoList << DataInfo{"001", "xx1", "-1"};infoList << DataInfo{"004", "xx4", "007"};//生成树状图QMap<QString, DataNode> dataMap;QMap<QString, DataNode*> ptrMap;for(auto d : infoList) {//父节点存在 并且 子节点存在if(ptrMap.contains(d.parentId) && ptrMap.contains(d.id)) {ptrMap[d.id]->info = d;ptrMap[d.parentId]->child[d.id] = dataMap.take(d.id);ptrMap.insert(d.id, &ptrMap[d.parentId]->child[d.id]);continue;}//父节点存在 并且 子节点不存在if(ptrMap.contains(d.parentId)) {ptrMap[d.parentId]->child[d.id].info = d;ptrMap.insert(d.id, &ptrMap[d.parentId]->child[d.id]);continue;}//父节点不存在 并且 子节点存在if(ptrMap.contains(d.id)) {ptrMap[d.id]->info = d;dataMap[d.parentId].child[d.id] = dataMap.take(d.id);ptrMap.insert(d.parentId, &dataMap[d.parentId]);continue;}//父节点不存在 并且 子节点不存在dataMap[d.parentId].child[d.id].info = d;ptrMap.insert(d.parentId, &dataMap[d.parentId]);ptrMap.insert(d.id, &dataMap[d.parentId].child[d.id]);}QTreeView view;QStandardItemModel *model = new QStandardItemModel;view.setModel(model);view.header()->hide();auto root = model->invisibleRootItem();root->appendRow(new QStandardItem("root"));root = root->child(0);print(dataMap);fillTree(dataMap, root);view.expandAll();view.show();return a.exec();
}