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Apache POI reading a xlsx file tutorial

Apache POI is a popular API that allows programmers to create, modify, and display MS Office files using Java programs. This tutorial shows how to read a xlsx file using Apache POI.

Difference between HSSF and XSSF?

HSSF is the POI Project’s pure Java implementation of the Excel ’97(-2007) file format.

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Apache POI writing to a xlsx file tutorial

This extends the tutorial Apache POI reading an xlsx file tutorial.

Step 1: The “WriteToExcelFile” Java code.

The xlsx file “employee-out.xlsx” will be created without any formatting.

Step 2: Adding styles

1) The columns are auto sized.

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Apache POI writing to xlsx with styles

This extends the previous tutorial of Apache POI writing to an excel file by using a blank template employee-blank.xlsx file to be filled with data. The blank xlsx brings in the style and labels.

Step 1: employee-template.xlsx


Step 2: writing to xlsx file using poi

Step 3: employee-out.xlsx


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