Selenium WebDriver-Java : Java를 사용하여 Selenium WebDriver의 Excel 파일에 웹 테이블 데이터를 작성하는 방법은 무엇입니까?

:) Java와 함께 Selenium-WebDriver를 사용하여 웹 테이블 데이터를 Excel 파일에 쓰려고합니다. 아래 코드로 Excel의 마지막 열 데이터 만 인쇄 할 수 있지만 전체 웹 테이블 데이터는 인쇄 할 수 없습니다. 여기 좀 도와 주 시겠어요 .....

import java.util.*; 
import java.lang.*; 
import  java.io.*;  
import org.apache.poi.xssf.usermodel.XSSFCell; 
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.WebDriver; 
import org.openqa.selenium.WebElement; 
import org.openqa.selenium.firefox.FirefoxDriver;  

public class WebTableTOSpreedsheet  
{ 
public static void main(String[] args) throws IOException  
{     
System.out.println("Hello Dear.....");     
System.out.println();  

WebDriver wb = new FirefoxDriver();          
wb.navigate().to("http://www.w3schools.com/html/html_tables.asp"); 
wb.manage().window().maximize();     
System.out.println(wb.getTitle() +" - WebPage has been launched");   

List<WebElement> irows =   wb.findElements(By.xpath("//*[@id='main']/table[1]/tbody/tr"));     
int iRowsCount = irows.size();     
List<WebElement> icols =   wb.findElements(By.xpath("//*[@id='main']/table[1]/tbody/tr[1]/th"));     
int iColsCount = icols.size();     
System.out.println("Selected web table has " +iRowsCount+ " Rows and " +iColsCount+ " Columns");     
System.out.println();      

FileOutputStream fos = new FileOutputStream("D://Software//AutomationPractise//WebTableTOSpreedsheet.xlsx");                                 

XSSFWorkbook wkb = new XSSFWorkbook();       
XSSFSheet sheet1 = wkb.createSheet("DataStorage"); 

for (int i=1;i<=iRowsCount;i++)      
{               
for (int j=1; j<=iColsCount;j++)                    
{           
if (i==1)       
{           
WebElement val= wb.findElement(By.xpath("//*[@id='main']/table[1]/tbody/tr["+i+"]/th["+j+"]"));             
String  a = val.getText();            
System.out.print(a);                        

XSSFRow excelRow = sheet1.createRow(i);             
XSSFCell excelCell = excelRow.createCell(j);                  
excelCell.setCellType(XSSFCell.CELL_TYPE_STRING);                 
excelCell.setCellValue(a);  

//wkb.write(fos);       
}       
else        
{           
WebElement val= wb.findElement(By.xpath("//*[@id='main']/table[1]/tbody/tr["+i+"]/td["+j+"]"));             
String a = val.getText();                    
System.out.print(a);                            

XSSFRow excelRow = sheet1.createRow(i);             
XSSFCell excelCell = excelRow.createCell(j);                      
excelCell.setCellType(XSSFCell.CELL_TYPE_STRING);                   
excelCell.setCellValue(a);   

//wkb.write(fos);       
}       
}               
System.out.println();     
}     
fos.flush();     
wkb.write(fos);     
fos.close();     
}
}

출력 : Excel에서 Webtable의 데이터 쓰기 문제