jcaptcha與spring結合實作

主題：

jcaptcha與spring結合實作

文章簡介：

在既有的spring登入畫面中加入圖型驗證碼

作者：

Zackily Huang

版本/產出日期：

V1.0/2016.09.08

<!--Jcaptcha -->

<dependency>

<groupId>com.octo.captcha</groupId>

<artifactId>jcaptcha-api</artifactId>

<version>1.0</version>

</dependency>

<dependency>

<groupId>com.octo.captcha</groupId>

<artifactId>jcaptcha</artifactId>

<version>2.0-alpha-1</version>

</dependency>

import com.octo.captcha.service.captchastore.FastHashMapCaptchaStore;

import com.octo.captcha.service.image.DefaultManageableImageCaptchaService;

import com.octo.captcha.service.image.ImageCaptchaService;

import com.taiwanmobile.beacon.portal.util.CaptchaEngineEx;

public class CaptchaServiceSingleton {

    private static ImageCaptchaService instance;

    static {

        instance = new DefaultManageableImageCaptchaService(

new FastHashMapCaptchaStore(), new CaptchaEngineEx(),

180, 100000, 75000);

    }

    public static ImageCaptchaService getInstance() {

        return instance;

    }

}

import java.awt.Font;

import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator;

import com.octo.captcha.component.image.backgroundgenerator.FunkyBackgroundGenerator;

import com.octo.captcha.component.image.color.RandomRangeColorGenerator;

import com.octo.captcha.component.image.fontgenerator.FontGenerator;

import com.octo.captcha.component.image.fontgenerator.RandomFontGenerator;

import com.octo.captcha.component.image.textpaster.RandomTextPaster;

import com.octo.captcha.component.image.textpaster.TextPaster;

import com.octo.captcha.component.image.wordtoimage.ComposedWordToImage;

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;

/**

* @author zackily

* 圖型驗證碼產生器主程式

*

*/

public class CaptchaEngineEx extends ListImageCaptchaEngine {

    @SuppressWarnings("deprecation")

    protected void buildInitialFactories() {

        /* 要用來產生驗證碼的隨機字元產生器 */

        WordGenerator wgen =

new RandomWordGenerator("1234567890123456789012345678901234567890");

        /*

         * 要用在驗證碼字元的隨機顏色產生器

         * new int[] {0, 100}《顏色較深較易辨視

         * new int[] {0, 200}《顏色較淺較難辨視

         */

RandomRangeColorGenerator cgen = new RandomRangeColorGenerator(

new int[] {0, 100},

new int[] {0, 100},

new int[] {0, 100});

        /*

         * RandomTextPaster(Integer minAcceptedWordLength, Integer

         * maxAcceptedWordLength, ColorGenerator colorGenerator, Boolean

         * manageColorPerGlyph)

         * minAcceptedWordLength驗證碼字元最少產生字元數

         * maxAcceptedWordLength驗證碼字元最多產生字元數

         */

TextPaster textPaster = new RandomTextPaster(new Integer(4),

new Integer(4),

cgen, true);

        /*

         * FunkyBackgroundGenerator(Integer width, Integer height)

         * 產生驗證碼的圖片尺寸

         * width寬度

         * height長度

         */

BackgroundGenerator backgroundGenerator = new FunkyBackgroundGenerator(

new Integer(120), new Integer(60));

        /* 要用來產生驗證碼的隨機字型陣列 */

Font[] fontsList = new Font[] {

new Font("nyala", Font.ITALIC, 10),

new Font("Bell MT", Font.PLAIN, 10),

new Font("Credit valley", Font.BOLD, 10),

};

        /*

         * RandomFontGenerator(Integer minFontSize, Integer maxFontSize,

Font[] fontsList)

         * 驗證碼產生器

         * minFontSize最小字元尺寸

         * maxFontSize最大字元尺寸

         */

FontGenerator fontGenerator = new RandomFontGenerator(new Integer(20),

new Integer(35),

fontsList);

WordToImage wordToImage = new ComposedWordToImage(fontGenerator,

backgroundGenerator,

textPaster);

this.addFactory(new GimpyFactory(wgen, wordToImage));

    }

}

<input type="text" name="jcaptcha" value="" />

<img src="generatImage" width="120" height="60">

@RequestMapping(value = "/generatImage")

public void ImageCaptcha(HttpServletRequest request, HttpServletResponse response, Model model)

            throws ServletException, IOException {

        byte[] captchaChallengeAsJpeg = null;

        // the output stream to render the captcha image as jpeg into

        ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();

        // get the session id that will identify the generated captcha.

        // the same id must be used to validate the response, the session id

        // is a good candidate!

        String captchaId = request.getSession().getId();

        // call the ImageCaptchaService getChallenge method

        BufferedImage challenge = CaptchaServiceSingleton.getInstance()

.getImageChallengeForID(captchaId, request.getLocale());

        // a jpeg encoder

        JPEGImageEncoder jpegEncoder = JPEGCodec

.createJPEGEncoder(jpegOutputStream);

        jpegEncoder.encode(challenge);

        captchaChallengeAsJpeg = jpegOutputStream.toByteArray();

        // flush it in the response

        response.setHeader("Cache-Control", "no-store");

        response.setHeader("Pragma", "no-cache");

        response.setDateHeader("Expires", 0);

        response.setContentType("image/jpeg");

        ServletOutputStream responseOutputStream = response.getOutputStream();

        responseOutputStream.write(captchaChallengeAsJpeg);

        responseOutputStream.flush();

        responseOutputStream.close();

}

String captchaId = request.getSession().getId();

String userCaptchaResponse = request.getParameter("jcaptcha");

boolean captchaPassed = CaptchaServiceSingleton.getInstance()

.validateResponseForID(captchaId, userCaptchaResponse);

if (!captchaPassed) {

    return "redirect:/auth/login.do?user=" + account + "&aaMsg=JCAERR";

}