how to write data into excel sheet in new row for

i am trying to write data from web table to excel sheet and able to write the data to excel , but for second instance of for loop it override the data or do not write data, My requirement is to write data to excel into new row for every new instance of for loop and not to override.. is it possible..? any help would be appreciate.. thanks in advance

data is writing into excel but need help near reader.setCellData

public class DataScraper {

 public static void main(String[] args) throws InterruptedException {


    WebDriver driver = new ChromeDriver();
    driver.manage().window().maximize();
    driver.manage().timeouts().implicitlyWait(40, TimeUnit.SECONDS);
    driver.get("https://etrain.info/in?PAGE=LIST--RAJ-TRAINS--1");

    //*[@id="lowerdata"]/table/tbody/tr[1]/td/table/tbody/tr[5]/td[1]/a
    //*[@id="lowerdata"]/table/tbody/tr[1]/td/table/tbody/tr[6]/td[1]/a
    //*[@id="lowerdata"]/table/tbody/tr[1]/td/table/tbody/tr[29]/td[1]/a


    String beforeXpath_TrainNoRow = "//td[@id='content']//tr[";
    String afterXpath_TrainNoRow = "]//td[1]";

    //div[@id='sublowerdata']//tr[3]//td[1]
    //div[@id='sublowerdata']//tr[11]//td[1]

    String beforeXpath_No = "//div[@id='sublowerdata']//tr[";
    String afterXpath_No = "]//td[1]";



    //int rowCount = TrainList.size();

    Xls_Reader reader = new Xls_Reader("C:\\Selenium_Automation\\Projects\\DataDriven_FW\\src\\com\\testdata\\TrainSchedule.xlsx");

    if(!reader.isSheetExist("Rajdhani")) {
        reader.addSheet("Rajdhani");
        reader.addColumn("Rajdhani", "IslNo");
        //reader.addColumn("TrainSearch", "TrainName");


    }

    for(int i = 5; i<= 30; i++) {
        String actualXpath_TrainNoRow = beforeXpath_TrainNoRow + i + afterXpath_TrainNoRow ;
        WebElement TrainNo = driver.findElement(By.xpath(actualXpath_TrainNoRow));
        TrainNo.click();
        Thread.sleep(5000);

        List<WebElement> rows = driver.findElements(By.xpath("//table[@id='schtbl']//tr"));
        System.out.println("total rows is "+ rows.size());

        int rowCount = rows.size();

        for(int j = 3; j<= rowCount - 1; j++) {

            String actualXpath_No = beforeXpath_No + j + afterXpath_No ;
            String SrNo = driver.findElement(By.xpath(actualXpath_No)).getText();
            int islNo = Integer.parseInt(SrNo);
            System.out.println(islNo);

            reader.setCellData("Rajdhani", "IslNo", j, SrNo);

        }

        driver.navigate().back();
        driver.navigate().refresh();

    }

    //table[@id='schtbl']//tr -- table rows inner

}

}

setCellData Method from XlsReader

public boolean setCellData(String sheetName,String colName,int rowNum, 
String data){
        try{
        fis = new FileInputStream(path); 
        workbook = new XSSFWorkbook(fis);

        if(rowNum<=0)
            return false;

        int index = workbook.getSheetIndex(sheetName);
        int colNum=-1;
        if(index==-1)
            return false;


        sheet = workbook.getSheetAt(index);


        row=sheet.getRow(0);
        for(int i=0;i<row.getLastCellNum();i++){
            //System.out.println(row.getCell(i).getStringCellValue().trim());
            if(row.getCell(i).getStringCellValue().trim().equals(colName))
                colNum=i;
        }
        if(colNum==-1)
            return false;

        sheet.autoSizeColumn(colNum); 
        row = sheet.getRow(rowNum-1);
        if (row == null)
            row = sheet.createRow(rowNum-1);

        cell = row.getCell(colNum); 
        if (cell == null)
            cell = row.createCell(colNum);

        // cell style
        //CellStyle cs = workbook.createCellStyle();
        //cs.setWrapText(true);
        //cell.setCellStyle(cs);
        cell.setCellValue(data);

        fileOut = new FileOutputStream(path);

        workbook.write(fileOut);

        fileOut.close();    

        }
        catch(Exception e){
            e.printStackTrace();
            return false;
        }
        return true;
    }

Hey Not sure what you are trying to achieve in this script, but here is the updated script. Please update the chrome driver path and excel file path in the below code. FYI: xpath can be written mode efficiently but did not touched them in this post.

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.TimeUnit;

import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.openqa.selenium.By;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.chrome.ChromeDriver;

public class TrainDeatils {

    public static void main(String[] args) throws InterruptedException, IOException {
        System.setProperty("webdriver.chrome.driver", "XXXchromedriver path goes here XXX");
        WebDriver driver = new ChromeDriver();
        driver.manage().window().maximize();
        driver.manage().timeouts().implicitlyWait(40, TimeUnit.SECONDS);
        driver.get("https://etrain.info/in?PAGE=LIST--RAJ-TRAINS--1");

        String beforeXpath_TrainNoRow = "//td[@id='content']//tr[";
        String afterXpath_TrainNoRow = "]//td[1]";
        String beforeXpath_No = "//div[@id='sublowerdata']//tr[";
        String afterXpath_No = "]//td[1]";

        XSSFWorkbook workbook = new XSSFWorkbook();
        XSSFSheet spreadsheet = workbook.createSheet( "Rajdhani");
        XSSFRow header;
        header = spreadsheet.createRow(0);
        header.createCell(0).setCellValue("Rajdhani");
        header.createCell(1).setCellValue("IslNo");
        int rowNumber = 1;
        for(int i = 5; i<= 7; i++) {
            Thread.sleep(1000);
            String actualXpath_TrainNoRow = beforeXpath_TrainNoRow + i + afterXpath_TrainNoRow ;
            WebElement TrainNo = driver.findElement(By.xpath(actualXpath_TrainNoRow));
            TrainNo.click();
            Thread.sleep(5000);

            List<WebElement> rows = driver.findElements(By.xpath("//table[@id='schtbl']//tr"));
            System.out.println("total rows is "+ rows.size());

            int rowCount = rows.size();

            for(int j = 3; j<= rowCount - 1; j++) {
                rowNumber = rowNumber+1;
                XSSFRow currentRow = spreadsheet.createRow(rowNumber);
                String actualXpath_No = beforeXpath_No + j + afterXpath_No ;
                String SrNo = driver.findElement(By.xpath(actualXpath_No)).getText();
                int islNo = Integer.parseInt(SrNo);
                System.out.println(islNo);
                currentRow.createCell(0).setCellValue(j);
                currentRow.createCell(1).setCellValue(SrNo);
            }

            driver.navigate().back();
            driver.navigate().refresh();

        }
        FileOutputStream out = new FileOutputStream(new File("XXXexcel file path goes hereXXX\\TrainDetails.xlsx"));

        workbook.write(out);
        out.close();
        driver.close();



    }

}