Скачать или смотреть How to Generate a Multi-Sheet Excel Report Using SXSSFWorkbook and XSSFSheet in Apache POI

Learn how to efficiently create multi-sheet Excel reports using `SXSSFWorkbook` for large data sets and `XSSFSheet` for charts with Apache POI.
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This video is based on the question https://stackoverflow.com/q/65621295/ asked by the user 'Doron Levi' ( https://stackoverflow.com/u/334181/ ) and on the answer https://stackoverflow.com/a/65651800/ provided by the user 'Doron Levi' ( https://stackoverflow.com/u/334181/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Multi-Sheet Excel Report with SXSSFWorkbook and XSSFSheet

When working with large datasets in Excel, it’s essential to use the right tools to ensure that your workbook performs efficiently. For Java developers using Apache POI, one common challenge is generating multi-sheet Excel reports where one sheet contains a large dataset, and another sheet contains charts. In this guide, we will explore how to effectively achieve this by utilizing SXSSFWorkbook and XSSFSheet.

Understanding the Components

What is SXSSFWorkbook?

SXSSFWorkbook (Streaming Workbook) is a class in Apache POI that is designed for writing large Excel files. Instead of holding all sheets in memory, it streams data directly to temporary files, thus allowing you to work with large datasets without running into memory issues.

What is XSSFSheet?

XSSFSheet is the standard sheet type you use with XSSFWorkbook (the class that handles standard Excel formats). This component supports creating rich charts and other complex content. However, XSSFSheet keeps all data in memory, making it less suitable for large datasets.

The Problem: Mixing SXSSFWorkbook and XSSFSheet

In your project, you need to generate a multi-sheet report where one sheet can handle a large table, requiring the use of SXSSFWorkbook, while another sheet needs XSSFSheet for producing charts. Unfortunately, you cannot directly create a XSSFSheet on an SXSSFWorkbook as they belong to different workbook types.

The Solution: Combining SXSSFWorkbook with XSSFSheet

Fortunately, there is a way to incorporate both SXSSFWorkbook and XSSFSheet to achieve the desired outcome. Here’s how:

Step 1: Create an XSSFWorkbook

Start by creating an instance of XSSFWorkbook. This will serve as your primary workbook object where you can add charts or other complex features.

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Step 2: Wrap it in a SXSSFWorkbook

Next, wrap your XSSFWorkbook in a SXSSFWorkbook. This allows you to benefit from the streaming capabilities while working with it.

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Step 3: Create an XSSFSheet for Charts

Here’s where the magic happens: you can now add your charts on the XSSFSheet created from the XSSFWorkbook.

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Step 4: Create the Large Data Sheet in SXSSFWorkbook

Now that the chart sheet is taken care of, you can create the large data sheet using the streaming workbook.

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Conclusion

By leveraging SXSSFWorkbook as a decorator for XSSFWorkbook, you can create an efficient multi-sheet Excel report that utilizes the large data handling capabilities of SXSSFWorkbook while still allowing for complex charting in XSSFSheet. This approach prevents memory issues and keeps your application running smoothly.

So whether you are generating comprehensive reports or detailed analytics, combining these two classes in Apache POI allows you to maximize efficiency and performance, ensuring that your workbooks are both robust and feature-rich.

Happy coding!