JSP is code that produces the client facing HTML code (commonly called the View) and the Servlet is server code. In reality they will be on different machines, so what is the use of the full path. The file contents should be POSTED to the servlet when submitting your form.
your jsp should something like:
<form action="UploadServlet" method="post"
enctype="multipart/form-data">
<input type="file" name="file" size="50" />
<br />
<input type="submit" value="Upload File" />
</form>
Of course you have other input fields as well.
See this link
How to upload files to server using JSP/Servlet?