Verification code generation component-Use of JCaptcha

The following is the code used in the project. The document is limited and you can directly use the code.

Jar package:

Whether other dependent packages are required. Unknown

Web. xml

      
  
   Jcaptcha
       
  
   com.bkgd.cms.servlet.JcaptchaServlet
  
 
      
  
   Jcaptcha
       
  
   /http://blog.csdn.net/itmyhome1990/article/details/captcha.svl
  
 

A service class is required to generate an Image

Package com. bkgd. cms. servlet; import java. awt. image. bufferedImage; import java. io. IOException; import javax. servlet. servletException; import javax. servlet. servletOutputStream; import javax. servlet. http. httpServlet; import javax. servlet. http. httpServletRequest; import javax. servlet. http. httpServletResponse; import org. apache. commons. io. output. byteArrayOutputStream; import org. apache. log4j. logger; import com. octo. captcha. service. captchaServiceException; import com.sun.image.codec.jpeg. export codec; import com.sun.image.codec.jpeg. required imageencoder; @ SuppressWarnings ("serial") public class JcaptchaServlet extends HttpServlet {public static final String CAPTCHA_IMAGE_FORMAT = "jpeg"; private static final Logger log = Logger. getLogger (JcaptchaServlet. class); @ Overridepublic void init () throws ServletException {}/*** @ step1 This method uses the Jcaptcha tool to generate an img image, output to the client * @ step2 and insert the following statement into the action submitted by the user to verify the verification code: Boolean isResponseCorrect = * captchaService. validateResponseForID (captchaId, ""); ** // @ Overrideprotected void doGet (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {byte [] response = null; byteArrayOutputStream extends outputstream = new ByteArrayOutputStream (); try {// store the Captcha ID by using the HttpSession ID. developers can also use other unique values String captchaId = request. getSession (). getId (); // obtain the image content used by GMailEngine BufferedImage challenge = JCaptchaServiceSingleton. getInstance (). getImageChallengeForID (captchaId, request. getLocale (); // output JPEG format: Required imageencoder required encoder = required codec. createJPEGEncoder (extends outputstream); extends encoder. encode (challenge);} catch (IllegalArgumentException e) {log. error (e); response. sendError (HttpServletResponse. SC _NOT_FOUND); return;} catch (CaptchaServiceException e) {log. error (e); response. sendError (HttpServletResponse. SC _INTERNAL_SERVER_ERROR); return;} captchaChallengeAsJpeg = extends outputstream. toByteArray (); response. setHeader ("Cache-Control", "no-store"); response. setHeader ("Pragma", "no-cache"); response. setDateHeader ("Expires", 0); // output JPEG image response. setContentType ("image/jpeg"); ServletOutputStream responseOutputStream = response. getOutputStream (); responseOutputStream. write (captchaChallengeAsJpeg); responseOutputStream. flush (); responseOutputStream. close ();}}

JCaptchaServiceSingleton

package com.bkgd.cms.servlet;import com.octo.captcha.service.captchastore.FastHashMapCaptchaStore;import com.octo.captcha.service.image.DefaultManageableImageCaptchaService;import com.octo.captcha.service.image.ImageCaptchaService;public class JCaptchaServiceSingleton {private static ImageCaptchaService imageCaptchaService = new DefaultManageableImageCaptchaService(new FastHashMapCaptchaStore(), new GMailEngine(), 180, 100000,75000);public static ImageCaptchaService getInstance() {return imageCaptchaService;}}

Verification Code-style Image Engine GMailEngine

Package com. bkgd. cms. servlet; import java. awt. color; import java. awt. font; import java. awt. image. imageFilter; import com. octo. captcha. component. image. backgroundgenerator. backgroundGenerator; import com. octo. captcha. component. image. backgroundgenerator. uniColorBackgroundGenerator; import com. octo. captcha. component. image. color. randomListColorGenerator; import com. octo. captcha. component. image. deformation. imageDeformation; import com. octo. captcha. component. image. deformation. imageDeformationByFilters; import com. octo. captcha. component. image. fontgenerator. fontGenerator; import com. octo. captcha. component. image. fontgenerator. randomFontGenerator; import com. octo. captcha. component. image. textpaster. decoratedRandomTextPaster; import com. octo. captcha. component. image. textpaster. textPaster; import com. octo. captcha. component. image. textpaster. textdecorator. textDecorator; import com. octo. captcha. component. image. wordtoimage. deformedComposedWordToImage; import com. octo. captcha. component. image. wordtoimage. wordToImage; import com. octo. captcha. component. word. wordgenerator. randomWordGenerator; import com. octo. captcha. component. word. wordgenerator. wordGenerator; import com. octo. captcha. engine. image. listImageCaptchaEngine; import com. octo. captcha. image. gimpy. gimpyFactory;/*** the image engine used to write the GMail Verification Code style in the format of JCaptcha2.0. */public class GMailEngine extends ListImageCaptchaEngine {@ Overrideprotected void equals () {int minWordLength = 4; int maxWordLength = 4; int fontSize = 26; int imageWidth = 110; int imageHeight = 50; // The display content WordGenerator dictionnaryWords = new RandomWordGenerator ("1234567890"); TextPaster randomPaster = new DecoratedRandomTextPaster (minWordLength, maxWordLength, new RandomListColorGenerator (new Color [] {new Color (0, 0, 0)}), new TextDecorator [] {}); BackgroundGenerator background = new UniColorBackgroundGenerator (imageWidth, imageHeight, Color. white); FontGenerator font = new RandomFontGenerator (fontSize, fontSize, new Font [] {new Font ("nyala", Font. BOLD, fontSize), new Font ("Bell MT", Font. PLAIN, fontSize), new Font ("Credit valley", Font. BOLD, fontSize)}); ImageDeformation postDef = new ImageDeformationByFilters (new ImageFilter [] {}); ImageDeformation backDef = new ImageDeformationByFilters (new ImageFilter [] {}); imageDeformation textDef = new partition (new ImageFilter [] {}); WordToImage word2image = new partition (font, background, randomPaster, backDef, textDef, postDef); addFactory (new GimpyFactory (dictionnaryWords, word2image ));}}

Foreground JSP

Background Action Verification

HttpServletRequest request = ServletActionContext.getRequest();String sessID = request.getSession().getId();Boolean isResponseCorrect = JCaptchaServiceSingleton.getInstance().validateResponseForID(sessID, checkCode);if(isResponseCorrect){return "true"}else{return "false"}