Use EasyExcel framework to handle large -scale Excel files

Use EasyExcel framework to handle large -scale Excel files Overview: In daily work, we often need to handle large -scale Excel files, such as data import, data processing, data conversion, etc.The traditional processing method may encounter difficulties due to problems such as file size and performance, so we can use the EasyExcel framework to simplify this process.EasyExcel is a Java -based open source framework that provides easy -to -use APIs to read, write and operate Excel files.This article will introduce how to use the EasyExcel framework to process the large -scale Excel file and provide the corresponding Java code example. Step 1: Import EasyExcel dependencies First, we need to add EasyExcel dependencies to the project.You can import the EasyExcel framework into the project by Maven or Gradle. Maven dependence: <dependency> <groupId>com.alibaba</groupId> <artifactId>easyexcel</artifactId> <version>2.4.1</version> </dependency> Gradle dependencies: groovy implementation 'com.alibaba:easyexcel:2.4.1' Step 2: Read the excel file In the next step, we will demonstrate how to use the EasyExcel framework to read the data in the Excel file.Please refer to the following example of Java code: public class ReadExcelExample { public static void main(String[] args) { String filePath = "path/to/excel/file.xlsx"; // Create a monitor that read Excel AnalysisEventListener<List<String>> listener = new AnalysisEventListener<List<String>>() { @Override public void invoke(List<String> data, AnalysisContext context) { // Treatment the obtained data System.out.println(data); } @Override public void doAfterAllAnalysed(AnalysisContext context) { // The operation after reading all the data } }; // Construct an Excel reader ExcelReader excelReader = EasyExcel.read(filePath, listener).build(); // Read all the data in Excel ReadSheet readSheet = EasyExcel.readSheet(0).build(); excelReader.read(readSheet); // Close the Excel reader excelReader.finish(); } } In the above example, we created a monitor to implement the AnalysiseventListener interface to process the data reading each line in the Invoke method.We build an Excel reader by calling the EasyExcel Read method, then specify the sheet page to be read through the readSheet method, and finally call the ExcelReader's read method to start reading the data in the excel file. Step 3: Write to the excel file Next, we will demonstrate how to use the EasyExcel framework to write the data to the Excel file.Please refer to the following example of Java code: public class WriteExcelExample { public static void main(String[] args) { String filePath = "path/to/excel/file.xlsx"; // Define data list List<List<String>> data = new ArrayList<>(); data.add (Arrays.aslist ("Name", "Age"); data.add (arrays.aslist ("Zhang San", "25"); data.add (Arrays.aslist ("Li Si", "28"); // Create a monitor written to Excel AnalysisEventListener<List<String>> listener = new AnalysisEventListener<List<String>>() { @Override public void invoke(List<String> row, AnalysisContext context) { // Process the written data } @Override public void doAfterAllAnalysed(AnalysisContext context) { // The operation after writing all the data } }; // Construct an Excel writer ExcelWriter excelWriter = EasyExcel.write(filePath, listener).build(); // Write the data to the Excel file WriteSheet writeSheet = EasyExcel.writerSheet(0, "Sheet1").build(); excelWriter.write(data, writeSheet); // Turn off Excel writer excelWriter.finish(); } } In the above examples, we created a monitor to implement the AnalysiseventListener interface to process the data written by each line in the Invoke method.We build an Excel writer by calling EasyExcel's Write method, and then specify the serial number and name of the sheet page through the WRITERSHEET method, and finally call the excelwriter's writing method to write the data into the Excel file. Conclusion: With the EasyExcel framework, we can easily read, write and handle large -scale Excel files.Through the above example code, we can easily start using EasyExcel to process Excel files to improve work efficiency and simplify the development process.