Create dynamic text image like as captcha ~ HTML Title Kartik Mandal


Dynamic captcha images create and download below jar file
Mail.jar
activation.jar

package com.barcode.demo;

import java.awt.Color;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.sql.Timestamp;
import java.util.Properties;

import javax.activation.DataHandler;
import javax.activation.DataSource;
import javax.activation.FileDataSource;
import javax.imageio.ImageIO;
import javax.mail.BodyPart;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;

public class CreateCaptchaImage {

 public static void main(String[] args) {

  cutomCaptchaGeneration();
 }

 /**
  * Default constructor.
  *
  * @param title
  *            the frame title.
  */
 public static void cutomCaptchaGeneration() {
  File file = null;
  Timestamp timestamp = new Timestamp(System.currentTimeMillis());
  try {
   file = File
     .createTempFile(timestamp.getTime() + "_Captcha", ".png");
  } catch (IOException e) {
   e.printStackTrace();
  }

  StringBuffer sb = createHtmlData();

  sendEmailToRecepint(file, sb);

 }

 private static StringBuffer createHtmlData() {
  StringBuffer sb = new StringBuffer();
  sb.append("<html><head></head><body><table><tr><th></th><th></th><th></th><th></th><th></th><th></th><th></th></tr><tr>");
  sb.append("<td rowspan=");
  sb.append(10);
  sb.append('"');
  sb.append(" colspan=");
  sb.append(3);
  sb.append('"');
  sb.append('>');
  sb.append("<img src=");
  sb.append("'");
  sb.append("cid:ea-image");
  sb.append("'");
  sb.append("width=");
  sb.append('"');
  sb.append(200);
  sb.append('"');
  sb.append("height=");
  sb.append('"');
  sb.append(200);
  sb.append('"');
  sb.append('/');
  sb.append('>');
  sb.append("</td><th></th><th></th><th></th></tr></body></html>");
  return sb;

  /**
   * <td rowspan="10" colspan="3">
   * <img src='cid:ea-image'
   * style="display: block; margin-left: auto; margin-right: auto;"
   * width="200" height="200"/></td>
   */
 }

 private static void sendEmailToRecepint(File file, StringBuffer sb) {
  // Recipient's email ID needs to be mentioned.
  String to = "kmandal@gmail.com";
  // Sender's email ID needs to be mentioned
  String from = "kmandal@kmical.com";
  final String username = "kmandal";// change accordingly
  final String password = "XXXXXXXXXXXXXXXX";// change accordingly

  // Assuming you are sending email through relay.jangosmtp.net
  String host = "XXXXXXXXXXXXXXXXXX";

  Properties props = new Properties();
  props.put("mail.smtp.auth", "true");
  props.put("mail.smtp.starttls.enable", "true");
  props.put("mail.smtp.host", host);
  props.put("mail.smtp.port", "25");

  Session session = Session.getInstance(props,
    new javax.mail.Authenticator() {
     protected PasswordAuthentication getPasswordAuthentication() {
      return new PasswordAuthentication(username, password);
     }
    });

  try {

   // Create a default MimeMessage object.
   Message message = new MimeMessage(session);

   // Set From: header field of the header.
   message.setFrom(new InternetAddress(from));

   // Set To: header field of the header.
   message.setRecipients(Message.RecipientType.TO,
     InternetAddress.parse(to));

   // Set Subject: header field
   message.setSubject("Demo snapshot");

   MimeMultipart multipart = new MimeMultipart();
   BodyPart messageBodyPart = new MimeBodyPart();

   messageBodyPart.setContent(sb.toString(), "text/HTML");
   multipart.addBodyPart(messageBodyPart);

   messageBodyPart = new MimeBodyPart();
   createCaptchaImage(file);

   DataSource fds = new FileDataSource(file);
   messageBodyPart.setDataHandler(new DataHandler(fds));
   // ea-image is image file name
   messageBodyPart.setHeader("Content-ID", "<ea-image>");

   // add image to the multipart
   multipart.addBodyPart(messageBodyPart);

   // put everything together
   message.setContent(multipart);

   Transport.send(message);

  } catch (Exception e) {
   System.out.println("Error of file");
  }
 }

 public static void createCaptchaImage(File file) {
  Timestamp timestamp = new Timestamp(System.currentTimeMillis());
  BufferedImage image = new BufferedImage(200, 40,
    BufferedImage.TYPE_BYTE_INDEXED);
  Graphics2D graphics = image.createGraphics();
  // Set back ground of the generated image to white
  graphics.setColor(Color.WHITE);
  graphics.fillRect(0, 0, 200, 40);
  // set gradient font of text to be converted to image
  GradientPaint gradientPaint = new GradientPaint(10, 5, Color.BLUE, 20,
    10, Color.LIGHT_GRAY, true);
  graphics.setPaint(gradientPaint);
  Font font = new Font("Comic Sans MS", Font.BOLD, 30);
  graphics.setFont(font);
  // write 'Hello World!' string in the image
  graphics.drawString(String.valueOf(timestamp.getTime()), 5, 30);
  // release resources used by graphics context
  graphics.dispose();

  try {
   ImageIO.write(image, "png", file);
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

 }

}

About Kartik Chandra Mandal

I am Kartik Chandra Mandal from Bangalore, India. Working as software engineer in Java technology. Have good knowledge of OWASP and CSRF in security for applications and it's implementation in Java technology.

HTML Title Kartik Mandal

Create dynamic text image like as captcha

About Kartik Chandra Mandal

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