public static void saveSpreadsheet(Spreadsheet spreadsheet) {
String filename = spreadsheet.getSrc();
SpreadSheetMetaInfo info = SpreadSheetMetaInfo.newInstance(filename);
Book wb = spreadsheet.getBook();
Exporter c = Exporters.getExporter("excel");
String fileName = getSpreadsheetStorageFolderPath() + info.getHashFileName();
File file = new File(fileName);
FileOutputStream out = null;
try {
file.createNewFile();
out = new FileOutputStream(file);
c.export(wb, out);
SpreadSheetMetaInfo.add(info);
} catch (IOException e) {
Messagebox.show("Save excel failed");
e.printStackTrace();
return;