Cannot Upload file from Local Machine

Hi,
I'm facing a problem while trying to upload an image from local machine hard drive to the database in web server using servlet.
I'm able to upload an image to the database in the local machine !!!!!!
But the image is not being uploaded to the remote database !!
The String CouponImage is a local machine path of the image like E:\Coupons\Coupon1.jpg . It's not being accepted.
Please help me. I'm new to servlet programming.
I'm using the following code

public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
{
res.setContentType("text/html");
try{
Connection connection = null;
FileInputStream fis = null;
PreparedStatement preparedStatement =null;
Class.forName("com.mysql.jdbc.Driver").newInstance ();
connection = DriverManager.getConnection ("jdbc:mysql://localhost/MobileCoupons",username,password);
String CouponImage = req.getParameter("upload");
String query = "INSERT INTO Coupondata(CouponImage) VALUES (?)";
preparedStatement = connection.prepareStatement(query);
File file = new File(CouponImage);
fis = new FileInputStream(file);
preparedStatement.setBinaryStream(3, fis, (int) file.length());
preparedStatement.execute();
connection.commit();
connection.close();
fis.close();
}
}

apjustin