EasyExcel Dynamic Columns [Sample Code] Set Cell Value to Dynamic Columns

# 1. Introduction

## Understanding the Concept and Application of EasyExcel

EasyExcel is an open-source Java library for manipulating Excel files, developed by Alibaba. It offers convenient and efficient functions for reading, writing, and converting Excel documents. In real-world development scenarios, EasyExcel is commonly used to handle large volumes of Excel data, providing both performance and scalability.

## Briefly Explaining the Use Cases of Dynamic Columns in Excel

Dynamic columns in Excel are widely applicable, especially in scenarios where columns need to be dynamically generated based on data. For instance, dynamically displaying tables that show sales figures or order volumes changing over time, or dynamically indicating the completion status of various tasks for multiple individuals. By setting cell values as dynamic columns, it's possible to render tables with a variable number of columns and content, offering flexibility to meet diverse presentation requirements.

# 2. Preparation

Before implementing dynamic column functionality, some preparatory work is necessary, which includes adding required dependencies, creating an Excel file template, and preparing a data source for dynamic columns. We will now delve into the details of these preparatory tasks.

# 3. Implementing Dynamic Column Functionality
In this chapter, we will detail how to implement dynamic column functionality within EasyExcel. This includes reading Excel files with EasyExcel, dynamically setting cell values through code, and handling methods for when dealing with large amounts of dynamic column data.

1. **Reading Excel files with EasyExcel:**
Before implementing dynamic column functionality, it's essential to read Excel files using EasyExcel for subsequent operations. The provided API by EasyExcel simplifies reading Excel files and handling their data.

2. **Writing code to dynamically set cell values:**
Once the Excel file is read, code needs to be written to dynamically set cell values as dynamic columns. This involves generating and populating column data dynamically based on business logic, ensuring data accuracy and completeness.

3. **Considering methods for handling large amounts of dynamic column data:**
When dealing with a large volume of dynamic column da