java验证码组件Jcaptcha

 

 Jcaptcha验证码生成组件用法

1.创建项目JcaptchaDemo

2.引入相关.jar文件

jcaptcha-1.0-all.jar；

commons-logging-1.0.4.jar；

commons-collections-2.1.1.jar

3.创建GMailEngine，仿照JCaptcha2.0编写GMail验证码样式的图片引擎.，具体的代码如下：

    设置生成验证的样式就是在这里设置。

package com.zsw.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.FileDictionary;
import com.octo.captcha.component.word.wordgenerator.ComposeDictionaryWordGenerator;
import com.octo.captcha.component.word.wordgenerator.WordGenerator;
import com.octo.captcha.engine.image.ListImageCaptchaEngine;
import com.octo.captcha.image.gimpy.GimpyFactory;
/**
 * 仿照JCaptcha2.0编写GMail验证码样式的图片引擎.  
 * @author Administrator
 */
public  class GMailEngine  extends ListImageCaptchaEngine  {
 @Override
  protected  void buildInitialFactories() {
  
    int minWordLength = 4;
    int maxWordLength = 5;
    int fontSize = 24;
    int imageWidth = 100;
    int imageHeight = 40;
           
    //word generator
   WordGenerator dictionnaryWords =  new ComposeDictionaryWordGenerator( new FileDictionary( "toddlist"));
           
    //word2image components 
   TextPaster randomPaster =  new DecoratedRandomTextPaster(
           minWordLength, 
           maxWordLength,
            new RandomListColorGenerator( new Color[] { 
              new Color(23, 170, 27), 
              new Color(220, 34, 11),   
              new Color(23, 67, 172) 
           }), 
                             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 ImageDeformationByFilters( new ImageFilter[] {}); 
   WordToImage word2image =  new DeformedComposedWordToImage(font, background, randomPaster, backDef, textDef,postDef);   
   addFactory( new GimpyFactory(dictionnaryWords, word2image));
 }
}

4.在这里创建一个单例类：

package com.zsw.servlet;
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( new FastHashMapCaptchaStore(),  new GMailEngine(), 180, 100000,75000);
  public  static ImageCaptchaService getInstance() {
   return instance;
 }
}

 

5.创建ImageCaptchaServlet.java，它是一个Servlet

图片src，制定这个Servlet在Web.xml中配置的名称，获取验证码图片。具体的内容如下：

package com.zsw.servlet;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
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 com.octo.captcha.service.CaptchaServiceException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public  class ImageCaptchaServlet  extends HttpServlet {
 
  private  static  final  long serialVersionUID = 1L;
     public ImageCaptchaServlet() {
    }
  protected  void doGet(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {
  
   byte[] captchaChallengeAsJpeg = null;
  ByteArrayOutputStream jpegOutputStream =  new ByteArrayOutputStream();
  
   try {
     String captchaId = request.getSession().getId();   
    BufferedImage challenge = CaptchaServiceSingleton.getInstance().getImageChallengeForID(captchaId,request.getLocale());
   JPEGImageEncoder jpegEncoder = JPEGCodec.createJPEGEncoder(jpegOutputStream);
   jpegEncoder.encode(challenge);
  }  catch (IllegalArgumentException e) {
   response.sendError(HttpServletResponse.SC_NOT_FOUND);
    return;
  }  catch (CaptchaServiceException e) {
   response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
    return;
  }
  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();
 }
  protected  void doPost(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {
  
 }
}

 

6.创建index.jsp以及sample.jsp

index.jsp

< %@ page language= "java"  contentType= "text/html; charset=UTF-8"  pageEncoding= "UTF-8" %>
< !DOCTYPE html PUBLIC  "-//W3C//DTD HTML 4.01 Transitional//EN"   "http://www.w3.org/TR/html4/loose.dtd" >
< html>
< head>
< meta http-equiv= "Content-Type"  content= "text/html; charset=UTF-8" >
< title>Insert title here< /title>
< /head>
< body>
< form action= "sample.jsp" >
 < table style= "width:300px; height:30px;"  cellpadding= "1"  cellspacing= "1"  border= "1" >
  < tr>
   < td align= "right" >
    < input type= 'text'  name= 'j_captcha_response'  value= '' >
   < /td>
   < td align= "left" >
    < img src= "ImageCaptchaServlet" >
   < /td>
  < /tr>
 < /table>
< /form>
< /body>
< /html>

sample.jsp：处理检验验证码

< %@ page language= "java"  contentType= "text/html; charset=ISO-8859-1"     pageEncoding= "UTF-8" %>
< %@page import= "com.octo.captcha.service.CaptchaServiceException" %>
< %@page import= "com.zsw.servlet.CaptchaServiceSingleton" %>
< %
 Boolean isResponseCorrect = Boolean.FALSE;
 String captchaId = request.getSession().getId();
 String responsestr = request.getParameter( "j_captcha_response" );
 
 try {
  isResponseCorrect = CaptchaServiceSingleton.getInstance().validateResponseForID(captchaId, responsestr);
  if(isResponseCorrect){
  }else{
   out.print( "It's worng......" );
  }
 } catch (CaptchaServiceException e) {
 }
%>

 

7.启动服务，运行程序效果如下：

 

8, 对设置验证样式的引擎类，进行重构，及支持验证码有背景图片

8.1 创建com.zsw.captcha包，将相关背景图片放入该包中；

8.2 创建JCaptchaEngine.java，具体内容如下：

package com.zsw.common;
import java.awt.Color;
import java.awt.Font;
import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator;
import com.octo.captcha.component.image.backgroundgenerator.FileReaderRandomBackgroundGenerator;
import com.octo.captcha.component.image.color.RandomListColorGenerator;
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.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;
/**
 * 生成验证码图片
 */
public  class JCaptchaEngine  extends ListImageCaptchaEngine {
  public  static  final  String IMAGE_CAPTCHA_KEY =  "imageCaptcha"; // ImageCaptcha对象存放在Session中的key
  public  static  final  String CAPTCHA_INPUT_NAME =  "j_captcha"; // 验证码输入表单名称
  public  static  final  String CAPTCHA_IMAGE_URL =  "/captcha.jpg"; // 验证码图片URL
  private  static  final Integer MIN_WORD_LENGTH = 4; // 验证码最小长度
  private  static  final Integer MAX_WORD_LENGTH = 4; // 验证码最大长度
  private  static  final Integer IMAGE_HEIGHT = 28; // 验证码图片高度
  private  static  final Integer IMAGE_WIDTH = 80; // 验证码图片宽度
  private  static  final Integer MIN_FONT_SIZE = 16; // 验证码最小字体
  private  static  final Integer MAX_FONT_SIZE = 16; // 验证码最大字体
  private  static  final  String RANDOM_WORD =  "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; // 随机字符
 private static final String IMAGE_PATH = "./com/zsw/captcha/";// 随机背景图片路径
 
  // 验证码随机字体
  private  static  final Font[] RANDOM_FONT =  new Font[] { 
    new Font( "nyala", Font.BOLD, MIN_FONT_SIZE), 
    new Font( "Arial", Font.BOLD, MIN_FONT_SIZE),
    new Font( "Bell MT", Font.BOLD, MIN_FONT_SIZE), 
    new Font( "Credit valley", Font.BOLD, MIN_FONT_SIZE),
    new Font( "Impact", Font.BOLD, MIN_FONT_SIZE) 
 };
  // 验证码随机颜色
  private  static  final Color[] RANDOM_COLOR =  new Color[] { 
    new Color(255, 255, 255), 
    new Color(255, 220, 220), 
    new Color(220, 255, 255), 
    new Color(220, 220, 255),
    new Color(255, 255, 220), 
    new Color(220, 255, 220) 
 };
  // 生成验证码
 @Override
  protected  void buildInitialFactories() {
  
  RandomListColorGenerator randomListColorGenerator =  new RandomListColorGenerator(RANDOM_COLOR); // 验证码随机颜色
  BackgroundGenerator backgroundGenerator =  new FileReaderRandomBackgroundGenerator(IMAGE_WIDTH, IMAGE_HEIGHT, IMAGE_PATH);  //验证码背景图片
  WordGenerator wordGenerator =  new RandomWordGenerator(RANDOM_WORD);
  FontGenerator fontGenerator =  new RandomFontGenerator(MIN_FONT_SIZE, MAX_FONT_SIZE, RANDOM_FONT); // 验证码随机字体
  TextDecorator[] textDecorator =  new TextDecorator[] {};
  TextPaster textPaster =  new DecoratedRandomTextPaster(MIN_WORD_LENGTH, MAX_WORD_LENGTH, randomListColorGenerator, textDecorator);
  WordToImage wordToImage =  new ComposedWordToImage(fontGenerator, backgroundGenerator, textPaster);
  addFactory( new GimpyFactory(wordGenerator, wordToImage));
 }
}

8.3 修改第4步中的单例类，具体内容如下：

package com.zsw.servlet;
import com.octo.captcha.service.captchastore.FastHashMapCaptchaStore;
import com.octo.captcha.service.image.DefaultManageableImageCaptchaService;
import com.octo.captcha.service.image.ImageCaptchaService;
import com.zsw.common.JCaptchaEngine;
public  class CaptchaServiceSingleton {
  private  static ImageCaptchaService instance =  new DefaultManageableImageCaptchaService( new FastHashMapCaptchaStore(),  new JCaptchaEngine(), 180, 100000,75000);
  public  static ImageCaptchaService getInstance() {
   return instance;
 }
}

8.4 运行启动，效果图如下：

 

 

1.参考相关文章

http://www.iteye.com/topic/567144