What is the usage of EasyExcel in Java?

EasyExcel is a Java open-source library for reading and writing data in Excel, offering a simple and user-friendly way to easily interact with Excel files.

With EasyExcel, you can perform the following operations:

1. Read Excel files: Data in Excel files can be read using EasyExcel, which supports reading different formats of Excel files, such as xls and xlsx.
2. Write to Excel file: Data can be written to an Excel file using EasyExcel, allowing for the customization of cell styles, font styles, and more.
3. Data transformation: EasyExcel supports converting data into various formats, such as converting data into List, Map, etc.
4. Large Data Processing: EasyExcel supports reading and writing large Excel files, allowing for efficient handling of substantial amounts of data.

The basic steps of using EasyExcel are as follows:

1. Introducing the EasyExcel library: Adding the dependency of EasyExcel library to the project.
2. Create an Excel listener: Develop a class that implements the listener interface provided by EasyExcel, and override the relevant methods to handle Excel data.
3. Read Excel data: By utilizing the reading method provided by EasyExcel, simply pass in the Excel file path and listener to extract the data from the Excel file.
4. Create an Excel writing listener: This involves creating a class that implements the listener interface provided by EasyExcel, and overriding the necessary methods to handle the logic for writing data to Excel.
5. Write Excel Data: By using the writing method provided by EasyExcel, you can pass the Excel file path, sheet name, data type, and listener to write the data into the Excel file.

The above is the basic usage of EasyExcel, which can be adjusted and expanded according to specific needs. You can refer to the official documentation and sample code of EasyExcel to learn more about its usage and operations.