导入导出excel的方式有很多种，我这里使用的表格类型为CSV，这样可以不依赖那些office软件
导入：

    QList<QStringList> data;
    QString file_name = QFileDialog::getOpenFileName(this,tr("Read file"),"",tr("file(*.csv)"));
    if(!(file_name.isEmpty())){
        QFile file(file_name);
        bool ret = file.open(QIODevice::Truncate|QIODevice::ReadOnly);
        if(!ret)
            return;
        QTextStream steam(&file);
        while(!steam.atEnd()){
            QString line = steam.readLine();
            QStringList row = line.split(",");
            data.append(row);
        }
        file.close();

        for(int i=0;i<7;i++){
            for(int j=1;j<ui->tableWidget->columnCount();j++){
                QTableWidgetItem *item=new QTableWidgetItem(data[j][i]);
                if(j==3){
                    item->setFlags(Qt::ItemIsEnabled);
                }
                ui->tableWidget->setItem(i,j,item);
            }
        }
        //qDebug()<<data;
    }

导出：

    QString file_name = QFileDialog::getSaveFileName(this,tr("Save file"),"",tr("file(*.csv)"));
    if(!(file_name.isEmpty())){
        QFile file(file_name);
        bool ret = file.open(QIODevice::Truncate|QIODevice::WriteOnly);
        if(!ret)
            return;
        QTextStream steam(&file);
        QString conTents;
        QHeaderView *header = ui->tableWidget->horizontalHeader();
        if(header){
            for ( int i = 0; i < header->count(); i++ )
            {
                QTableWidgetItem *item = ui->tableWidget->horizontalHeaderItem(i);
                if (!item)
                {
                    continue;
                }
                conTents += item->text() + ",";
            }
            conTents += "\n";
        }

        for ( int i = 0 ; i < ui->tableWidget->rowCount(); i++ )
        {
            for ( int j = 0; j < ui->tableWidget->columnCount(); j++ )
            {

                QTableWidgetItem* item = ui->tableWidget->item(i, j);
                if ( !item ){
                    conTents+=",";
                    continue;
                }
                QString str = item->text();
                str.replace(","," ");
                conTents += str + ",";
            }
            conTents += "\n";
        }
        steam << conTents;
        file.close();
        QMessageBox::information(this,"通知","文件保存成功");