EasyExcel framework Frequently Asked Questions Answers and Skills

EasyExcel framework Frequently Asked Questions Answers and Skills EasyExcel is a lightweight Excel operating framework developed based on Java. It provides easy -to -use API to read, write and operate Excel files.In the process of using the EasyExcel framework, you may encounter some common problems.This article will answer these questions and provide some use skills. Question 1: How to use EasyExcel to read the excel file? To read the excel file with EasyExcel, you can follow the steps below: 1. Introduce EasyExcel dependencies: In your Java project, add EasyExcel Maven or Gradle dependencies. 2. Create Excel Reading Surveying Listener: You need to create a class inherited from `AnalysisVentListener` and realize the necessary methods to process the read data. The following is a simple example, which is used to read the code of the Excel file: public class ExcelListener extends AnalysisEventListener<YourDataModel> { // Rewrite the INVOKE method to process the data you read @Override public void invoke(YourDataModel data, AnalysisContext context) { // Process the data you read } // Rewrite the DoaFTERANALYSED method to perform some operations after EXCEL reads the completion @Override public void doAfterAllAnalysed(AnalysisContext context) { // Excel reads the operation after completing } } 3. Execute reading operation: Use the method of `EasyExcel.read () to read the excel file and pass the previously created monitor. String excelFilePath = "path/to/your/excel/file.xlsx"; EasyExcel.read(excelFilePath, YourDataModel.class, new ExcelListener()).sheet().doRead(); Question 2: How to use EasyExcel to write to the excel file? To write the Excel file with EasyExcel, you can follow the steps below: 1. Create an Excel writer: You need to create an `ExcelWriter` object for writing data to the Excel file. 2. Set the excel head: Use the `Excelwriter.write () method to set the header of the Excel file. 3. Write the data: Write the data through the method of `Excelwriter.write ()` `) to the Excel file. The following is a simple example, which is used to write the code to the Excel file: String excelFilePath = "path/to/your/excel/file.xlsx"; // Create an excelwriter object ExcelWriter excelWriter = EasyExcel.write(excelFilePath).build(); // Set the excel header WriteSheet writeSheet = EasyExcel.writerSheet("Sheet1").build(); // Define data list List<YourDataModel> dataList = new ArrayList<>(); // Write the data to the excel file excelWriter.write(dataList, writeSheet); // Close ExcelWriter excelWriter.finish(); Question 3: How to handle the excel file with a large amount of data? If your Excel file is very large and contains a lot of data, the use of the default reading method may cause memory overflow.To solve this problem, you can use the SAX -based reading method provided by EasyExcel. Using the SAX mode reading method can avoid loading all data into the memory at one time, but read data and process it through the listener.This method can ensure that the problem of memory overflow will not cause memory overflow when dealing with the excel file of large data. Below is a sample code that reads the excel file in the SAX mode: String excelFilePath = "path/to/your/excel/file.xlsx"; // Create an Excel reader ExcelReader excelReader = EasyExcel.read(excelFilePath, YourDataModel.class, new ExcelListener()).build(); // Read the excel file ReadSheet readSheet = EasyExcel.readSheet().build(); excelReader.read(readSheet); // Close ExcelReader excelReader.finish(); Reading the excel file by using the SAX mode, you can handle a very large excel file without causing memory overflow. This is the introduction of the common questions and skills of the EasyExcel framework. I hope it will be helpful to you.In actual use, you can also further explore the more functions and characteristics of the EasyExcel framework according to your needs and specific business scenarios.