How to Read/Write Excel Data in Selenium Using Apache POI

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.1.1</version>
</dependency>

package excelExportAndFileIO;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.ss.usermodel.Row;

import org.apache.poi.ss.usermodel.Sheet;

import org.apache.poi.ss.usermodel.Workbook;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ReadGuru99ExcelFile {

    public void readExcel(String filePath,String fileName,String sheetName) throws IOException{

    //Create an object of File class to open xlsx file

    File file =    new File(filePath+"\\"+fileName);

    //Create an object of FileInputStream class to read excel file

    FileInputStream inputStream = new FileInputStream(file);

    Workbook guru99Workbook = null;

    //Find the file extension by splitting file name in substring  and getting only extension name

    String fileExtensionName = fileName.substring(fileName.indexOf("."));

    //Check condition if the file is xlsx file

    if(fileExtensionName.equals(".xlsx")){

    //If it is xlsx file then create object of XSSFWorkbook class

    guru99Workbook = new XSSFWorkbook(inputStream);

    }

    //Check condition if the file is xls file

    else if(fileExtensionName.equals(".xls")){

        //If it is xls file then create object of HSSFWorkbook class

        guru99Workbook = new HSSFWorkbook(inputStream);

    }

    //Read sheet inside the workbook by its name

    Sheet guru99Sheet = guru99Workbook.getSheet(sheetName);

    //Find number of rows in excel file

    int rowCount = guru99Sheet.getLastRowNum()-guru99Sheet.getFirstRowNum();

    //Create a loop over all the rows of excel file to read it

    for (int i = 0; i < rowCount+1; i++) {

        Row row = guru99Sheet.getRow(i);

        //Create a loop to print cell values in a row

        for (int j = 0; j < row.getLastCellNum(); j++) {

            //Print Excel data in console

            System.out.print(row.getCell(j).getStringCellValue()+"|| ");

        }

        System.out.println();
    } 

    }  

    //Main function is calling readExcel function to read data from excel file

    public static void main(String...strings) throws IOException{

    //Create an object of ReadGuru99ExcelFile class

    ReadGuru99ExcelFile objExcelFile = new ReadGuru99ExcelFile();

    //Prepare the path of excel file

    String filePath = System.getProperty("user.dir")+"\\src\\excelExportAndFileIO";

    //Call read file method of the class to read data

    objExcelFile.readExcel(filePath,"ExportExcel.xlsx","ExcelGuru99Demo");

    }

}

package excelExportAndFileIO;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

import org.apache.poi.ss.usermodel.Cell;

import org.apache.poi.ss.usermodel.Row;

import org.apache.poi.ss.usermodel.Sheet;

import org.apache.poi.ss.usermodel.Workbook;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class WriteGuru99ExcelFile {

    public void writeExcel(String filePath,String fileName,String sheetName,String[] dataToWrite) throws IOException{

        //Create an object of File class to open xlsx file

        File file =    new File(filePath+"\\"+fileName);

        //Create an object of FileInputStream class to read excel file

        FileInputStream inputStream = new FileInputStream(file);

        Workbook guru99Workbook = null;

        //Find the file extension by splitting  file name in substring and getting only extension name

        String fileExtensionName = fileName.substring(fileName.indexOf("."));

        //Check condition if the file is xlsx file

        if(fileExtensionName.equals(".xlsx")){

        //If it is xlsx file then create object of XSSFWorkbook class

        guru99Workbook = new XSSFWorkbook(inputStream);

        }

        //Check condition if the file is xls file

        else if(fileExtensionName.equals(".xls")){

            //If it is xls file then create object of XSSFWorkbook class

            guru99Workbook = new HSSFWorkbook(inputStream);

        }    

    //Read excel sheet by sheet name    

    Sheet sheet = guru99Workbook.getSheet(sheetName);

    //Get the current count of rows in excel file

    int rowCount = sheet.getLastRowNum()-sheet.getFirstRowNum();

    //Get the first row from the sheet

    Row row = sheet.getRow(0);

    //Create a new row and append it at last of sheet

    Row newRow = sheet.createRow(rowCount+1);

    //Create a loop over the cell of newly created Row

    for(int j = 0; j < row.getLastCellNum(); j++){

        //Fill data in row

        Cell cell = newRow.createCell(j);

        cell.setCellValue(dataToWrite[j]);

    }

    //Close input stream

    inputStream.close();

    //Create an object of FileOutputStream class to create write data in excel file

    FileOutputStream outputStream = new FileOutputStream(file);

    //write data in the excel file

    guru99Workbook.write(outputStream);

    //close output stream

    outputStream.close();
	
    }

    public static void main(String...strings) throws IOException{

        //Create an array with the data in the same order in which you expect to be filled in excel file

        String[] valueToWrite = {"Mr. E","Noida"};

        //Create an object of current class

        WriteGuru99ExcelFile objExcelFile = new WriteGuru99ExcelFile();

        //Write the file using file name, sheet name and the data to be filled

        objExcelFile.writeExcel(System.getProperty("user.dir")+"\\src\\excelExportAndFileIO","ExportExcel.xlsx","ExcelGuru99Demo",valueToWrite);

    }

}