CAPTCHA User Input

 /*
Takes the session variable CAPTCHA_URL, generates a user input window, then saves the output to CAPTCHA_TEXT.
*/

import javax.swing.JOptionPane;

cfile = "captcha_image_" + System.currentTimeMillis();
session.log( "CAPTCHA_URL: " + session.getVariable("CAPTCHA_URL") );
session.log( "CAPTCHA image file: " + cfile );
session.downloadFile( session.getVariable(  "CAPTCHA_URL" ), cfile );

imageIcon = new ImageIcon( cfile );

// Prompt the user for the text in the image.
response = JOptionPane.showInputDialog
(
null,
"Enter the text in the image",
"CAPTCHA Image",
JOptionPane.QUESTION_MESSAGE,
imageIcon,
null,
null
);
session.log( "User response: " + response );
session.setVariable( "CAPTCHA_TEXT", response );

imageIcon = null;

// Delete the image, now that we no longer need it.
new File( cfile ).delete();

System.gc();