Fetching 100,000+ rows into a List can trigger an OutOfMemoryError . For large exports, you must use for both the database and the file generation. Spring Boot Export Data to Excel with Apache POI Example
This guide covers everything from basic implementations to handling millions of records without crashing your server. 1. Key Libraries for Excel Generation mybatis excel download
Java does not have built-in support for Excel, so you must add a third-party library to your project. Fetching 100,000+ rows into a List can trigger
Define a simple query in your mapper to fetch the data you want to export. @Mapper public interface UserMapper { List findAllUsers(); }
@Mapper public interface UserMapper { List findAllUsers(); } Use code with caution. Step 2: The Service Layer
The service layer acts as the bridge, fetching data via MyBatis and building the workbook using POI.
Implementing Excel Download with MyBatis: A Comprehensive Guide
