Reading and Writing Excel Files in Java using Apache POI Code

Learn how to manipulate Excel files in Java with Apache POI. This guide provides examples for reading and writing Excel files using the popular Apache POI library.
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Apache POI (Poor Obfuscation Implementation) is a powerful Java library that allows developers to create, modify, and manipulate Microsoft Office files, including Excel spreadsheets. In this guide, we will explore how to use Apache POI to read and write Excel files in Java.

Reading Excel Files

To read data from an Excel file, you can use the HSSFWorkbook class for .xls files (Excel 97-2003) or XSSFWorkbook for .xlsx files (Excel 2007 and later). Here's a simple example using XSSFWorkbook:

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Writing Excel Files

To create or modify Excel files, you can use the same HSSFWorkbook and XSSFWorkbook classes. Here's a simple example of writing data to an Excel file:

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Conclusion

Manipulating Excel files in Java is made easy with the Apache POI library. Whether you need to read existing data or create new Excel files, Apache POI provides the necessary tools to handle Excel files programmatically. These examples are just a starting point, and you can explore more features offered by Apache POI to meet your specific requirements.

Remember to include the Apache POI library in your project's dependencies to use these classes effectively. You can download the latest version from the Apache POI website or include it using a build tool like Maven or Gradle.

Happy coding!