用 jcaptcha 自定义验证码

用 jcaptcha 自定义验证码

import com.octo.captcha.service.captchastore.FastHashMapCaptchaStore;
import com.octo.captcha.service.image.DefaultManageableImageCaptchaService;
import com.octo.captcha.service.image.ImageCaptchaService;

public class CaptchaServiceSingleton {
   
    private static ImageCaptchaService instance = new DefaultManageableImageCaptchaService();
    static {
    instance = new DefaultManageableImageCaptchaService(
       new FastHashMapCaptchaStore(),
       new MyImageCaptchaEngine(),
       180,
       100000,
       75000);
    }
   
    public static ImageCaptchaService getInstance(){
        return instance;
    }
}

===========================================================================

package common.web;

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;

public class MyImageCaptchaEngine extends ListImageCaptchaEngine {
    protected void buildInitialFactories() {
           WordGenerator wgen = new RandomWordGenerator("abcdefghijklmnopquvwxyz123456789");
           RandomRangeColorGenerator cgen = new RandomRangeColorGenerator(
                new int[] {0, 100},
                new int[] {0, 100},
                new int[] {0, 100});
           //文字显示4个数
           TextPaster textPaster = new RandomTextPaster(new Integer(4), new Integer(4), cgen, true);
           //图片的大小
           BackgroundGenerator backgroundGenerator = new FunkyBackgroundGenerator(new Integer(200), new Integer(45));

           Font[] fontsList = new Font[] {
               new Font("Arial", 0, 10),
               new Font("Tahoma", 0, 10),
               new Font("Verdana", 0, 10),
            };
        
           FontGenerator fontGenerator = new RandomFontGenerator(new Integer(20), new Integer(30), fontsList);

            WordToImage wordToImage = new ComposedWordToImage(fontGenerator, backgroundGenerator, textPaster);
            this.addFactory(new GimpyFactory(wgen, wordToImage));
    }
}


===========================================================================

/**
*
*/
package common.web;

import com.octo.captcha.service.CaptchaServiceException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;


public class ImageCaptchaServlet extends HttpServlet {


    public void init(ServletConfig servletConfig) throws ServletException {

        super.init(servletConfig);

    }


    protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws ServletException, IOException {
       
    byte[] captchaChallengeAsJpeg = null;
        // the output stream to render the captcha image as jpeg into
       
    ByteArrayOutputStream jpegOutputStream = new ByteArrayOutputStream();
       
    try {
        // 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 = httpServletRequest.getSession().getId();
        // call the ImageCaptchaService getChallenge method
            BufferedImage challenge =
                    CaptchaServiceSingleton.getInstance().getImageChallengeForID(captchaId,
                            httpServletRequest.getLocale());
           
            // a jpeg encoder
            JPEGImageEncoder jpegEncoder =
                    JPEGCodec.createJPEGEncoder(jpegOutputStream);
            jpegEncoder.encode(challenge);
        } catch (IllegalArgumentException e) {
            httpServletResponse.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        } catch (CaptchaServiceException e) {
            httpServletResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            return;
        }

        captchaChallengeAsJpeg = jpegOutputStream.toByteArray();

        // flush it in the response
        httpServletResponse.setHeader("Cache-Control", "no-store");
        httpServletResponse.setHeader("Pragma", "no-cache");
        httpServletResponse.setDateHeader("Expires", 0);
        httpServletResponse.setContentType("image/jpeg");
        ServletOutputStream responseOutputStream =
                httpServletResponse.getOutputStream();
        responseOutputStream.write(captchaChallengeAsJpeg);
        responseOutputStream.flush();
        responseOutputStream.close();
    }
}

==================================================================

package common.global;

/**
* @author mu_zb
* @function 工程错误代码定义
*/
public class ErrorCode { public static final int NEWS_OK       = 0; // 操作成功����ɹ�
public static final int LOGIN_CAPTCHA_ERROR         = -1004;

}
=============================================


-1004 = （操作失败）验证码出错

====================================

登录哦的JSP

         <tr>
          <td class="title" colspan="2">
           验证码
          </td>
         </tr>
       
         <tr>
          <td colspan="2" height="25px;">
           <img src="jcaptcha">
           <input type='text' name='j_captcha_response' value=''>
          </td>
         </tr>
========================================

action

   // check验证码
   Boolean isResponseCorrect = Boolean.FALSE;
   // remenber that we need an id to validate!
   String captchaId = request.getSession().getId();
   // retrieve the response
   String strImg = request.getParameter("j_captcha_response");
   // Call the Service method
   isResponseCorrect = CaptchaServiceSingleton.getInstance().validateResponseForID(captchaId, strImg);
   if(!isResponseCorrect.booleanValue()){
    nReturn = ErrorCode.LOGIN_CAPTCHA_ERROR;
   }
   if(isResponseCorrect.booleanValue()){
    nReturn = service.checkUser(objForm);
   }
==============================================