java验证码组件kaptcha使用方法

使用方法：

项目中导入kaptcha-2.3.jar包

在web.xml里面新增：

<servlet>
        <servlet-name>Kaptcha</servlet-name>
        <servlet-class>com.google.code.kaptcha.servlet.KaptchaServlet</servlet-class>
                   <init-param>
            <param-name>kaptcha.producer.impl</param-name>
            <param-value>com.google.code.kaptcha.impl.DefaultKaptcha </param-value>
        </init-param>
                   <init-param>
                            <param-name>kaptcha.textproducer.font.color</param-name>
                            <param-value>black</param-value>
                   </init-param>
                   <init-param>
                            <param-name>kaptcha.textproducer.char.space</param-name>
                            <param-value>10</param-value>
                   </init-param>
                   <init-param>
                            <param-name>kaptcha.border</param-name>
                            <param-value>no</param-value>
                   </init-param>
                   <init-param>
                            <param-name>kaptcha.border.thickness</param-name>
                            <param-value>0</param-value>
                   </init-param>
                   <init-param>
                            <param-name>kaptcha.textproducer.font.size</param-name>
                            <param-value>35</param-value>
                   </init-param>
                   <init-param>
                            <param-name>kaptcha.textproducer.char.length</param-name>
                            <param-value>4</param-value>
                   </init-param>
                   <init-param>
            <param-name>kaptcha.image.width</param-name>
            <param-value>150</param-value>
        </init-param>
        <init-param>
            <param-name>kaptcha.image.height</param-name>
            <param-value>50</param-value>
        </init-param>
        <init-param>
                            <param-name>kaptcha.background.clear.from</param-name>
                            <param-value>255,255,255</param-value>
                   </init-param>
                   <init-param>
                            <param-name>kaptcha.background.clear.to</param-name>
                            <param-value>255,255,255</param-value>
                   </init-param>
                   <init-param>
            <param-name>kaptcha.textproducer.char.string</param-name>
            <param-value>0123456789</param-value>
        </init-param>
        <init-param>
            <param-name>kaptcha.textproducer.font.names</param-name>
            <param-value>Arial Black</param-value>
        </init-param>
         <init-param>
            <param-name>kaptcha.noise.impl</param-name>
            <param-value>com.google.code.kaptcha.impl.NoNoise</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>Kaptcha</servlet-name>
        <url-pattern>/kaptcha.jpg</url-pattern>
</servlet-mapping>

在页面上新增

<img id="img" src="kaptcha.jpg" width="90" height="25" onclick="refresh();" alt="点击更换验证码"/>
function refresh() {
document.getElementById('img').src="kaptcha.jpg?"+Math.random();
}

在action里获取验证码ID：

request.getSession().getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);

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：

java验证码组件kaptcha使用方法的更多相关文章

推荐一款java的验证码组件——kaptcha
使用方法: 项目中导入kaptcha-2.3.jar包在web.xml里面新增:  <servlet> <servlet- ...
在 Java EE 组件中使用 Camel Routes
摘要:你可以通过集成 Camel 和 WildFly 应用服务器(使用 WildFly-Camel 子系统)在 Java EE 组件中开始使用 Apache Camel Routes. [编者按]作者 ...
kaptcha 验证码组件使用
kaptcha 验证码组件使用简介 kaptcha 是一个非常实用的验证码生成工具.有了它,你可以生成各种样式的验证码,因为它是可配置的.kaptcha工作的原理是调用 com.google.co ...
kaptcha图形验证码组件
kaptcha 是一个非常实用的验证码生成工具.有了它,你可以生成各种样式的验证码,因为它是可配置的.kaptcha工作的原理是调用 com.google.code.kaptcha.servlet.K ...
kaptcha Java验证码
原文:http://www.cnblogs.com/chizizhixin/p/5311619.html 在项目中经常会使用验证码,kaptcha 就一个非常不错的开源框架,分享下自己在项目中的使用: ...
java 调用webservice的各种方法总结
java 调用webservice的各种方法总结几种流行的开源WebService框架Axis1,Axis2,Xfire,CXF,JWS比较方法一:创建基于JAX-WS的webservice(包括 ...
Java Swing 绝对布局管理方法，null布局（转）
首先把相关容器的布局方式设为 setLayout(null); 然后调用组件的 setBounds() 方法设置button的位置为(100,100) 长宽分别为 60,25 jButton.se ...
springMVC+Java验证码完善注册功能
这篇文章简单的写了一个java验证码,为之前写过的springMVC注册功能加上验证码,验证码的作用就不多说了,防止机器人程序恶意注册什么的.. 其中User.java,加上了password和cod ...
java制作验证码（java验证码小程序）
手动制作java的验证码 Web应用验证码的组成: (1)输入框 (2)显示验证码的图片验证码的制作流程: 生成验证码的容器使用 j2ee的servlet 生成图片需要的类: (1) Buffere ...

随机推荐

ios开发入门资料整理
说到 iOS 开发,自己学得也很浅.不过至少独立一人完成了一个应用的开发到 App Store 上线整个过程.既然有人让我说些推荐和建议,就分享一下. 首先建议阅读 Start Developing ...
Stream转MemoryStream解决Stream.Length报错此流不支持查找操作
1.StreamToMemoryStream MemoryStream StreamToMemoryStream(Stream instream) { MemoryStream outstream = ...
RSA加密解密（python版）
RSA的算法涉及三个参数,n.e.d. 其中,n是两个大质数p.q的积,n的二进制表示时所占用的位数,就是所谓的密钥长度. e1和d是一对相关的值,e可以任意取,但要求e与(p-1)*(q-1)互质: ...
java 小程序-- 汉诺塔
1.code public static void main(String[] args) { ; moveDish(, 'A', 'B', 'C'); } public static void mo ...
Web Service代理类生成工具
本文原文连接:http://www.cnblogs.com/dengxinglin/p/3334158.html 之前一篇文章写 Web Service服务代理类生成及编译 , 通过命令行的方式可以直 ...
更新整理本人所有博文中提供的代码与工具（C++，2013.10）
为了更方便地管理博文中涉及的各种代码与工具资源,现在把这些资源迁移到 Google Code 中,有兴趣者可前往下载. C++ 1.<通用高性能 Windows Socket 组件 HP-Soc ...
点击div全选中再点击取消全选div里面的文字
想做一个就是点击一个div然后实现的功能是div里面的文字都成选中状态,然后就可以利用浏览器的自带的复制功能,任意复制在哪里去了在网上百度了一下然后网上的答案感觉很大的范围然后一些搜索然后就锁 ...
ENVI【遥感图像预处理之图像的几何校正】
---恢复内容开始--- 一.图像几何校正的概述 1.几何校正方法: 1)利用卫星自带的地理定位文件进行几何校正.主菜单>>>Map>>Georeference传感器的名 ...
分享5种风格的 jQuery 分页效果【附代码】
jPaginate 是一款非常精致的分页插件,提供了五种不同风格的分页效果,支持鼠标悬停翻页,快速分页功能.这款插件还提供了丰富的配置选项,你可以根据需要进行设置. 效果演示源码下载各个 ...
ie7下<a></a>标签中<input />时不反应
<a href="News?id=@dr["id"].CInt()" ><input type="button" valu ...

java验证码组件kaptcha使用方法

java验证码组件kaptcha使用方法的更多相关文章

随机推荐

热门专题