jcaptcha(高级)

图片验证：jcaptcha

ImageEngine:

package com.sky;
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 ImageCaptchaEngine extends ListImageCaptchaEngine {
protected void buildInitialFactories() {
  // 随机生成的字符   
  WordGenerator wgen = new RandomWordGenerator(
    "abcdefghijklmnopqrstuvwxyz123456789");
  RandomRangeColorGenerator cgen = new RandomRangeColorGenerator(
    new int[] { 0, 100 }, new int[] { 0, 100 },
    new int[] { 0, 100 });
  // 文字显示的个数   
  TextPaster textPaster = new RandomTextPaster(new Integer(6),
    new Integer(6), cgen, true);
  // 图片的大小   
  BackgroundGenerator backgroundGenerator = new FunkyBackgroundGenerator(
    new Integer(150), new Integer(50));
  // 字体格式   
  Font[] fontsList = new Font[] { new Font("Arial", 0, 10),
    new Font("Tahoma", 0, 10), new Font("Verdana", 0, 10), };
  // 文字的大小   
  FontGenerator fontGenerator = new RandomFontGenerator(new Integer(15),
    new Integer(30), fontsList);

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

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

ImageCaptchaServlet:

public class ImageCaptchaServlet extends HttpServlet {
private static final long serialVersionUID = 3258417209566116145L;

private Log logger = LogFactory.getLog(this.getClass());

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 image captcha service defined via the
   //SpringFramework
   ApplicationContext ctx = WebApplicationContextUtils
     .getRequiredWebApplicationContext(getServletContext());
   Object bean = ctx.getBean("jcaptchaService");
   ImageCaptchaService imageCaptchaService = (ImageCaptchaService) bean;

   // get the id that will identify the generated captcha.
   // the same id must be used to validate the response
   String captchaId = httpServletRequest.getParameter("captchaId");
   logger.debug("captchaIdParameter: "
     + httpServletRequest.getParameter("captchaId"));
   if (captchaId == null) {
    // If a captcha id is not passed in, use the session id
    captchaId = httpServletRequest.getSession().getId();
    logger.debug("httpServletRequest.session.id: "
      + httpServletRequest.getSession().getId());
   }

   logger.debug("captchaId: " + captchaId);
   // call the ImageCaptchaService getChallenge method
   BufferedImage challenge = imageCaptchaService
     .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();
}
}


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

ValidateJcaptchaAction (struts2 action):

private ImageCaptchaService jcaptchaService;
private String jcaptchaResponse;

public String validateJcaptcha() {

//getRequest() 是我自己写的get request 对象方法 在父类里实现了的
  String id = getRequest().getSession().getId();
  if (StringUtils.isNotBlank(jcaptchaResponse)) {
   Boolean flag = jcaptchaService.validateResponseForID(id,
     jcaptchaResponse);
   if (flag) {
    return SUCCESS;
   }
  }
  return INPUT;
}

public void setJcaptchaService(ImageCaptchaService jcaptchaService) {
  this.jcaptchaService = jcaptchaService;
}

public String getJcaptchaResponse() {
  return jcaptchaResponse;
}

public void setJcaptchaResponse(String jcaptchaResponse) {
  this.jcaptchaResponse = jcaptchaResponse;
}

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

captcaha.jsp页面：

<%@ page language="java" contentType="text/html; charset=GBK"
    pageEncoding="GBK"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

  <title>jcaptcha 使用</title>
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">

  <meta http-equiv="expires" content="0">
  <meta http-equiv="keywords" content="java,jcaptcha,验证码,更换图片">
  <meta http-equiv="description" content="java 验证码 javascript">
  <!--
  <link rel="stylesheet" type="text/css" href="styles.css">
  -->
</head>

<body>
  <script language="javascript" type="text/javascript">
   function changeImage() {
       //下面两种方法都可以用 
    //document.photo.src='jcaptcha?id=' + Math.random();
    document.getElementById('kaptchaImage').src = 'jcaptcha?id=' + Math.random();
   }
  </script> 
  <table>

   <tr>
    <td>
     <img src="jcaptcha" width="200" id="kaptchaImage"  name="photo" onclick="changeImage();">
    </td>
   </tr>
   <tr>
    <td>   
     <a href="javascript:changeImage();" title="看不清,换一张" tabindex="-2"
      style="color: gray; width: 130px">看不清,换一张</a>
    </td>

  
   </tr>
   <tr>
    <td valign="top">
     <form method="POST" action="verify.action" name="jcaptcha">
      <br>
      请输入验证码:
      <input type="text" name="j_captcha_response" value=''>
      <br>
      <input type="submit" name="submit">

     </form>
    </td>
   </tr>
  </table>
</body>
</html>
=================================================

web.xml:
<servlet>
  <servlet-name>jcaptcha</servlet-name>
  <servlet-class>com.radicasys.signup.jcaptcha.ImageCaptchaServlet</servlet-class>
  <load-on-startup>3</load-on-startup>
</servlet>
<servlet-mapping>
  <servlet-name>jcaptcha</servlet-name>
  <url-pattern>/jcaptcha</url-pattern>
</servlet-mapping>

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

pom.xml设定：

<dependency>
   <groupId>com.octo.captcha</groupId>
   <artifactId>jcaptcha-all</artifactId>
   <version>1.0-RC6</version>
  </dependency>

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

在spring 配置文件里 设定下ValidateJcaptchaAction 和jcaptchaService

applicationContext-service.xml

<bean id="jcaptchaService"
  class="com.octo.captcha.service.multitype.GenericManageableCaptchaService">
  <constructor-arg index="0">
   <ref bean="imageEngine" />
  </constructor-arg>
  <constructor-arg index="1">
   <value>1</value>
  </constructor-arg>
  <constructor-arg index="2">
   <value>180000</value>
  </constructor-arg>
</bean>
<!-- coding  way to set imageEngine-->
  <bean id="imageEngine" class="com.radicasys.signup.jcaptcha.ImageEngine">
  </bean>

applicationCotext-struts.xml

<bean name="jcaptchaAction" class="com.radicasys.signup.jcaptcha.ValidateJcaptchaAction">
  <property name="jcaptchaService" ref="jcaptchaService"/>
</bean>

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

struts2 配置页面(struts.xml)

<action name="" class="">

<result>你自己的页面</result>

<result name="input">你自己的页面</result>

</action>

基本上就是这样了，不过最好是在spring那里配置图片样式，自己写代码（上面的ImageCaptchaEngine 类）对以后的更改不方便，这里有个参考：你也可以对着那个ImageCaptchaEngine去配置

<bean id="imageEngine"
  class="com.octo.captcha.engine.GenericCaptchaEngine">
  <constructor-arg index="0">
   <list>
    <ref bean="CaptchaFactory" />
   </list>
  </constructor-arg>
</bean>

<bean id="CaptchaFactory"
  class="com.octo.captcha.image.gimpy.GimpyFactory">
  <constructor-arg>
   <ref bean="wordgen" />
  </constructor-arg>
  <constructor-arg>
   <ref bean="wordtoimage" />
  </constructor-arg>
</bean>

<bean id="wordgen"
  class="com.octo.captcha.component.word.wordgenerator.DictionaryWordGenerator">
  <constructor-arg>
   <ref bean="filedict" />
  </constructor-arg>
</bean>

<bean id="wordtoimage"
  class="com.octo.captcha.component.image.wordtoimage.ComposedWordToImage">
  <constructor-arg index="0">
   <ref bean="fontGenRandom" />
  </constructor-arg>
  <constructor-arg index="1">
   <ref bean="backGenUni" />
  </constructor-arg>
  <constructor-arg index="2">
   <ref bean="simpleWhitePaster" />
  </constructor-arg>
</bean>

<bean id="filedict"
  class="com.octo.captcha.component.word.FileDictionary">
  <constructor-arg index="0">
   <value>toddlist</value>
  </constructor-arg>
</bean>

<bean id="fontGenRandom"
  class="com.octo.captcha.component.image.fontgenerator.RandomFontGenerator">
  <!-- font min -->
  <constructor-arg index="0">
   <value>20</value>
  </constructor-arg>
  <!--font max -->
  <constructor-arg index="1">
   <value>20</value>
  </constructor-arg>
  <constructor-arg index="2">
   <list>
    <ref bean="fontArial" />
   </list>
  </constructor-arg>
</bean>

<bean id="fontArial" class="java.awt.Font">
  <constructor-arg index="0">
   <value>Arial</value>
  </constructor-arg>
  <constructor-arg index="1">
   <value>0</value>
  </constructor-arg>
  <constructor-arg index="2">
   <value>10</value>
  </constructor-arg>
</bean>

<bean id="backGenUni"
  class="com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator">
  <!--length -->
  <constructor-arg index="0">
   <value>80</value>
  </constructor-arg>
  <!--hight  -->
  <constructor-arg index="1">
   <value>25</value>
  </constructor-arg>
</bean>
<bean id="simpleWhitePaster"
  class="com.octo.captcha.component.image.textpaster.SimpleTextPaster">
  <!-- min number -->
  <constructor-arg type="java.lang.Integer" index="0">
   <value>4</value>
  </constructor-arg>
  <!--max number -->
  <constructor-arg type="java.lang.Integer" index="1">
   <value>4</value>
  </constructor-arg>
  <!-- color -->
  <constructor-arg type="java.awt.Color" index="2">
   <ref bean="colorGreen" />
  </constructor-arg>
</bean>
<bean id="colorGreen" class="java.awt.Color">
  <constructor-arg index="0">
   <value>0</value>
  </constructor-arg>
  <constructor-arg index="1">
   <value>0</value>
  </constructor-arg>
  <constructor-arg index="2">
   <value>255</value>
  </constructor-arg>
</bean>


本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/bluelzx/archive/2008/01/22/2058505.aspx

评论

1 楼 奇林醉 2012-05-15