how to put field values of a jsp in to a java api as a parameter

to this servlet i have to get values of to,from address and filename from a jsp though all jar files are put in class path the servlet is not recognized

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try{
String to = request.getParameter("to");
String from = request.getParameter("from");
String host = request.getParameter("host");
String filename = request.getParameter("filename");
//String msgText1 = "Sending a file.\n";
//String subject = "Sending a file";

// create some properties and get the default Session
Properties props = System.getProperties();
// Add property for smtp server.
props.put("mail.smtp.host", host);

Session mailSession =
Session.getDefaultInstance(props, null);

Message msg = new MimeMessage(mailSession);
msg.setFrom(new InternetAddress(from));
msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to,false));
msg.setRecipients(Message.RecipientType.CC,InternetAddress.parse
( "vineeth.kumar@bhasin.in", false));
msg.setSubject(
"This message was sent with JavaMail...");

MimeBodyPart mbp1 = new MimeBodyPart();
mbp1.setText("JavaMail... It works! ");

MimeBodyPart mbp2 = new MimeBodyPart();
/** Create the FileDataSource. The constructor requires the fully
qualified path to the file. Note that we use
File.separator to put the correct separator (/,\,:,etc) between
the directory and file name. This way, you can pass in the path
and file_name and your email program doesn't care if it is running
on Unix, Windows or Macintosh.**/

String file_dir = "D:/";
String file_name = filename;
String fs = System.getProperty("file.separator");
FileDataSource fds = new FileDataSource(file_dir+fs+file_name);
// Next, attach the file data source to the MimeBodyPart
mbp2.setDataHandler(new DataHandler(fds));
/** We can use the MimeBodyPart.setFileName() method to set the
name of the attachment as it will appear in the email. Generally,
this is set to the name used to generate the data source (fds.getName()),
although you can set it to any String value. **/
mbp2.setFileName(fds.getName());

// create the Multipart and its parts to it
Multipart mp = new MimeMultipart();
mp.addBodyPart(mbp1);
mp.addBodyPart(mbp2);
// add the Multipart to the MimeMessage object msg
msg.setContent(mp);

// use the static Transport method to send the

Transport.send(msg);
System.out.println("Message Sent");
}
catch (MessagingException mex) {
mex.printStackTrace();
Exception ex = null;
if ((ex = mex.getNextException()) != null) {
ex.printStackTrace();
}
}
}