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EasyExcel is a Java library focused on reading and writing Excel files with very low memory usage, making it suitable for large datasets that overwhelm traditional APIs. It uses streaming/event-driven parsing to avoid loading entire workbooks into memory, and it maps rows to Java objects via simple annotations. Writers support multiple sheets, custom styles, merged cells, and template-based filling so production reports remain maintainable. The API emphasizes developer ergonomics: callbacks are straightforward, converters handle common type transformations, and header/column mapping is explicit. It integrates cleanly into Spring/enterprise stacks, often as part of import/export pipelines or scheduled report generation. By optimizing both performance and ease of use, EasyExcel reduces operational risk around big Excel jobs in web services and back-office tools.
Features
- Lightweight and efficient Excel handling tool written in Java
- Avoids OOM errors by using a streaming approach (minimal memory footprint) over Apache POI SAX parser
- Supports both read and write operations with simple API
- Optimized for large file processing by minimizing memory consumption
- Open source under Apache-2.0 license and backed by Alibaba; widely used (33k stars)
- Provides quickstart documentation and usage examples for reading, writing, file upload/download scenarios
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