Data Driven script with WebDriver

Example Testcase: Create a script to check login functionality of Gmail.

Steps followed:

1) Open Google.
2) Click on Sign in
3) Enter Username and Password.
4) Submit Creds.
5) Check if the user is Signed In

Script:

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.TimeUnit;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.junit.*;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

 public class TestScript
 {
	
	@Test
 	public void Login() throws IOException
 	{	

	String Path="D://TestData.xls"; 
	int row\_count;	
	String Username, Password;
	
	InputStream in=new FileInputStream(Path);  

	_//Create an inputstream object of our Testdata File._

	h4.Workbook wbook=new HSSFWorkbook(in); 

      _//Create XLS workbook Object_

	Sheet sheet=wbook.getSheetAt(0);	
	_//Get the First sheet of our Workbook._
		
	row\_count=sheet.getLastRowNum(); 
       
_//Get the used Row count of the Sheet._
	
	for(int row=1;row<=row_count;row++)// iterate through the rows
	{
	WebDriver driver=new FirefoxDriver();
	_//Create a Driver object and initialize it with a Firefox browser._

	Username=sheet.getRow(row).getCell(0).getStringCellValue();
	_//Get the Username cell value of the current row._

	Password=sheet.getRow(row).getCell(1).getStringCellValue();
	_//Get the Password cell value of the current row._
						
	 driver.get("https://www.google.co.in/");
_//Open Google using get method._

	driver.manage().window().maximize();
	driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);
	driver.findElement(By.linkText("Gmail")).click();
	driver.findElement(By.id("Email")).sendKeys(Username);
	driver.findElement(By.id("Passwd")).sendKeys(Password);
	driver.findElement(By.id("signIn")).click();
			
	_//creation of custom assertion to check if mail search box is present:_
if(driver.findElement(By.id("gbqfq")).isDisplayed())		
_//check if the element is displayed_
{
         sheet.getRow(row).createCell(2).setCellType(Cell.CELL_TYPE_STRING);
	_//Create a new cell to add the result. And set the type as String._

	sheet.getRow(row).createCell(2).setCellValue("Passed");   
_//add ‘PASSED’ value to cell_

	}
	else
	sheet.getRow(row).createCell(2).setCellValue("Falied");
_//add ‘Failed’ value to cell_

driver.quit();
_//close the browser._

	}

	FileOutputStream out=new FileOutputStream(Path);
_//Create a FileOutput object to save result._

	wbook.write(out);
	_//Save EXCEL file._

	out.close();
_//Close the connection and free the memory._
	
	}
	
}