Login shared network drive with JAVA

package utilities;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.mail.MessagingException;
 
public class CopyFile {
 
        protected String myFromFileDirectory;
        protected String myDestinationFileDirectory;
        
        public CopyFile(String fromFileName,String toFileName) throws MessagingException{
                Email em = new Email();
                myFromFileDirectory = fromFileName;
                myDestinationFileDirectory = toFileName;
                 try {
                         File fromFile = new File(fromFileName);
                         File toFile = new File(toFileName);
                         FileInputStream from = null;
                         FileOutputStream to = null;
                         from = new FileInputStream(fromFile);
                         to = new FileOutputStream(toFile);
                         byte[] buffer = new byte[4096];
                         int bytesRead;
                         while ((bytesRead = from.read(buffer)) != -1)
                         to.write(buffer, 0, bytesRead); // write               
                  } catch (IOException e) {
                    System.err.println(e.getMessage());
                    em.postExceptionToMe("myEmail@hotmail.com", "File Transfer Exception","myEmail@hotmail.com", e);
                  }
                 }
        public static void main(String[] args) {
                String from="D:\\FileName.csv";
                String to="\\\\serverName\\SHARENAME\\FileName.csv";
                try {
                        new CopyFile(from,to);
                } catch (MessagingException e) {
                   e.printStackTrace();
                }
        }
        }