Converting XLSB to XLSX in Java

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Introduction

Binary Excel files, often denoted as XLSB files, are a binary format used by Microsoft Excel for storing spreadsheet data. In some scenarios, it becomes necessary to convert these files to the more commonly used XLSX format, especially when working with Java applications. In this blog post, we'll explore how to convert XLSB to XLSX using Java with code examples.

Prerequisites

Before diving into the code, make sure you have the following:

- Java Development Kit (JDK) installed on your machine

- Apache POI library: Download the JAR file from the Apache POI website (https://poi.apache.org/) and include it in your Java project.

Code Example

Below is a simple Java program that demonstrates how to convert XLSB to XLSX using the Apache POI library.

import org.apache.poi.ss.usermodel.Workbook;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import org.apache.poi.xssf.usermodel.XSSFWorkbookFactory;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

public class XLSBtoXLSXConverter {

    public static void main(String[] args) {

        // Replace these paths with the actual paths of your input and output files

        String inputFilePath = "path/to/your/inputfile.xlsb";

        String outputFilePath = "path/to/your/outputfile.xlsx";

        try {

            // Read the XLSB file using FileInputStream

            FileInputStream xlsbFileInputStream = new FileInputStream(inputFilePath);

            // Create a Workbook from the XLSB file

            Workbook workbook = XSSFWorkbookFactory.createWorkbook(xlsbFileInputStream);

            // Write the Workbook to an XLSX file using FileOutputStream

            try (FileOutputStream xlsxFileOutputStream = new FileOutputStream(outputFilePath)) {

                workbook.write(xlsxFileOutputStream);

            }

            System.out.println("Conversion completed successfully.");

        } catch (IOException e) {

            e.printStackTrace();

            System.out.println("Error during conversion: " + e.getMessage());

        }

    }

}

Explanation

1. Import Required Libraries:

   - Import necessary classes from the Apache POI library.

2. Define File Paths:

   - Replace the placeholder file paths with the actual paths of your input XLSB file and the desired output XLSX file.

3. Read XLSB File:

   - Use `FileInputStream` to read the input XLSB file.

4. Create Workbook:

   - Use `XSSFWorkbookFactory.createWorkbook()` to create a Workbook from the XLSB file.

5. Write XLSX File:

   - Use `FileOutputStream` to write the Workbook to the output XLSX file.

6. Handle Exceptions:

   - Catch and handle any potential IO exceptions.

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Conclusion

Converting XLSB to XLSX in Java is made straightforward with the Apache POI library. By following the steps outlined in this blog post and using the provided code example, you can easily perform this conversion in your Java applications.

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