Apache POI, using both XSSF and HSSF

Question

I have a problem with Apache POI project.

I failed to use XSSF and HSSF in the \"Same Java Class\". Which jar should I dow

Answer 1

Aside from the "standard" SS package solution, you can also simply use an if statement to correctly load the right workbook format into an Workbook interface object, like so:

Workbook workbook; //<-Interface, accepts both HSSF and XSSF.
File file = new File("YourExcelFile.xlsx");
if (FileUtils.getFileExt(file).equalsIgnoreCase("xls")) {
  workbook = new HSSFWorkbook(new FileInputStream(file));
} else if (FileUtils.getFileExt(file).equalsIgnoreCase("xlsx")) {
  workbook = new XSSFWorkbook(new FileInputStream(file));
} else {
  throw new IllegalArgumentException("Received file does not have a standard excel extension.");
}