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It is a POI library written in Java that gives users an API for manipulating Microsoft documents like.xls and.xlsx. The Apache POI in Selenium is a widely used API for selenium data driven testing. Workbook = workbook = new XSSFWorkbook(new FileInputStream(new File('fileName'))) If you don't know the file format before reading and sometimes finding.xls or.xlsx file extension may not be always good enough to find the actual file format.

Subsequently, in this article, we will understand the details of Apache POI and how we can use the same to read/write data from Excel files, by covering the details under the. But, Apache POI is one of the most used libraries, which provides various classes and methods to read/write data from various formats of Excel files(xls, xlsx etc).

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. Where as Apache POI supports both xls and xlsx file formats. It only supports the old BIFF (binary) '.xls' format. As we know the main difference with Java JXL which does not support the Excel 2007 '.xlsx' file format. This library is capable enough to read and write both XLS and XLSX file format of Excel. To read or write an Excel,Apache provides a very famous library POI. To Read and Write excel files in Selenium we have to take help of third party API like JXL and Apache POI.