Read/Write .xls and .xlsx with one set of code using POI - WorkbookFactory

As we discussed in earlier post Read/Write excel using Apache POI,
we have to use:
For handling .xls files, we use HSSF (Horrible SpreadSheet Format) related POI classes.
For handling .xlsx files, we use XSSF (XML SpreadSheet Format) related POI classes.

On this post, how we can perform excel operations with one set code for both excel formats .xls and .xlsx.
For this we have a class provided from Apache POI WorkbookFactory, which auto detects appropriate kind of Workbook (HSSFWorkbook or XSSFWorkbook) depending on the excel formats .xls or .xlsx.
Let's jump to the code implementation

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;

public class ExcelUtil {
 private static Workbook wb;
 private static Sheet s;
 private static FileInputStream fis;
 private static FileOutputStream fos;
 private static Row row;
 private static Cell cell;
public static void main(String[] args) throws Exception {
        fis = new FileInputStream("./TestData.xls"); //same we can use TestData.xlsx as well
        wb = WorkbookFactory.create(fis);
        s = wb.getSheet(Sheet1);
        row  = s.getRow(rownum);
 if(row ==null)
 {
         row = s.createRow(rownum);
        }
        cell = row.getCell(colnum);
        if (cell != null) 
 {
  cell.setCellValue(text);
        } 
 else 
 {
  cell = row.createCell(colnum);
                cell.setCellValue(text);  
        }
        fos = new FileOutputStream(ExcelPath);
        wb.write(fos);
        fos.flush();
 fos.close();
   }
}

As you can see, only line changed from earlier post, code changed for line:

wb = WorkbookFactory.create(fis);

Hope this helps!