Apache POI

How to Update Excel 2003 (.xls) FILE

Steps to be followed while updating an excel file –

1. Open Existing workbook using an input stream since, we want to read content from existing file.

2. Get existing sheet then row and then cell objects for existing content that we want to update.

3. Else, Create sheet/row/cell on need.

4. Update the selected cells.

5. Open an output stream and write to workbook.

6. Close all streams and workbook objects.

Let us see an example by using the above steps :

How to read an Excel 2007 (.xlsx) file using Apache POI

As we know the main difference with Java JXL which does not support the Excel 2007 ".xlsx" file format. It only supports the old BIFF (binary) ".xls" format. Where as Apache POI supports both xls and xlsx file formats.

To read an Excel 2007 (.xlsx) we need to use XSSF (XML SpreadSheet Format) and we will use the below classes to work with xlsx files by importing the below statements