Exports can be routed through a save dialog that also exposes per-format export settings, via StiFileSaveDialog.

Open the save dialog for a format.
private void export(StiExportFormat format) {
    StiFileSaveDialog dialog = new StiFileSaveDialog(format, report, report.getReportAlias());
    // The dialog lets the user choose the file and adjust export settings,
    // then writes the document in the selected format.
}

How it works. The dialog wraps StiExportManager with a UI, letting users pick the destination and tune settings before the export runs.
На скриншоте ниже Вы можете увидеть результат выполнения данного кода:

Exporting a Report with the Export Dialog