验证码实用工具Jtaptcha

CAPTCHA是Completely Automated Public Turing Test to Tell Computers and Humans Apart

全自动区分计算机和人类的图灵测试的简称

1.引入jar包

jcaptcha-1.0.jar

2.配置mvc整合文件 ***.xml

<!-- 指定Spring Bean的配置文件所在目录。默认配置在WEB-INF目录下 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext*.xml,classpath:***.xml</param-value>
    </context-param>
    <filter>
        <filter-name>encoding</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>

 2.1 ***.xml 内容

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd"
    default-lazy-init="true">

    <!--kaptcha验证码
        <bean id="captchaProducer"
            class="com.google.code.kaptcha.impl.DefaultKaptcha">
            <property name="config">
                <bean class="com.google.code.kaptcha.util.Config">
                    <constructor-arg type="java.util.Properties">
                        <value>kaptcha.border=yes</value>
                    </constructor-arg>
                </bean>
            </property>
        </bean>
        -->
    <bean id="captchaService" class="com.octo.captcha.service.multitype.GenericManageableCaptchaService">
        <constructor-arg index="0" ref="imageEngine"/>
        <constructor-arg type="int" index="1" value="180"/>
        <constructor-arg type="int" index="2" value="100000"/>
        <constructor-arg type="int" index="3" value="75000"/>
    </bean>
    <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.RandomWordGenerator">        
        <!--可选字符-->
        <constructor-arg>
            <value>aabbccddeefgghhkkmnnooppqqsstuuvvwxxyyzz</value>
        </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="decoratedPaster"/>
        </constructor-arg>
    </bean>

    <bean id="fontGenRandom" class="com.octo.captcha.component.image.fontgenerator.RandomFontGenerator">
        <!--最小字体-->
        <constructor-arg index="0">
            <value>14</value>
        </constructor-arg>
        <!--最大字体-->
        <constructor-arg index="1">
            <value>20</value>
        </constructor-arg>
        <constructor-arg index="2">
            <list>
                <bean 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>32</value></constructor-arg>
                </bean>
            </list>
        </constructor-arg>
    </bean>
    <bean id="backGenUni" class="com.octo.captcha.component.image.backgroundgenerator.UniColorBackgroundGenerator">
        <!--背景宽度-->
        <constructor-arg index="0">
            <value>80</value>
        </constructor-arg>
        <!--背景高度-->
        <constructor-arg index="1">
            <value>28</value>
        </constructor-arg>
    </bean>

    <bean id="decoratedPaster" class="com.octo.captcha.component.image.textpaster.DecoratedRandomTextPaster">
        <!--最大字符长度-->
        <constructor-arg type="java.lang.Integer" index="0">
            <value>4</value>
        </constructor-arg>
        <!--最小字符长度-->
        <constructor-arg type="java.lang.Integer" index="1">
            <value>4</value>
        </constructor-arg>
        <!--文本颜色-->
        <constructor-arg index="2">
            <ref bean="colorGen"/>
        </constructor-arg>
        <!--文本混淆-->
        <constructor-arg index="3">
            <list>
                <!--<ref bean="baffleDecorator"/>-->
            </list>
        </constructor-arg>
    </bean>    
    <bean id="baffleDecorator" class="com.octo.captcha.component.image.textpaster.textdecorator.BaffleTextDecorator">
        <constructor-arg type="java.lang.Integer" index="0"><value>1</value></constructor-arg>
        <constructor-arg type="java.awt.Color" index="1"><ref bean="colorWrite"/></constructor-arg>
    </bean>
    <bean id="colorGen" class="com.octo.captcha.component.image.color.SingleColorGenerator">
        <constructor-arg type="java.awt.Color" index="0">
            <ref bean="colorBlack"/>
        </constructor-arg>
    </bean>
    <bean id="colorWrite" class="java.awt.Color">
        <constructor-arg type="int" index="0">
            <value>255</value>
        </constructor-arg>
        <constructor-arg type="int" index="1">
            <value>255</value>
        </constructor-arg>
        <constructor-arg type="int" index="2">
            <value>255</value>
        </constructor-arg>
    </bean>
    <bean id="colorBlack" class="java.awt.Color">
        <constructor-arg type="int" index="0">
            <value>50</value>
        </constructor-arg>
        <constructor-arg type="int" index="1">
            <value>50</value>
        </constructor-arg>
        <constructor-arg type="int" index="2">
            <value>50</value>
        </constructor-arg>
    </bean>
</beans>

3.web.xml整合***.xml

<servlet>
        <servlet-name>Jcaptcha</servlet-name>
        <servlet-class>com.rbao.east.servlet.JcaptchaServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jcaptcha</servlet-name>
        <url-pattern>/captcha.svl</url-pattern>
    </servlet-mapping>

4.建立提供验证码的servlet

import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.output.ByteArrayOutputStream;
import org.springframework.beans.factory.BeanFactoryUtils;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

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


/**
 * 提供验证码图片的Servlet
 */
@SuppressWarnings("serial")
public class JcaptchaServlet extends HttpServlet {
    public static final String CAPTCHA_IMAGE_FORMAT = "jpeg";

    private ImageCaptchaService captchaService;

    @Override
    public void init() throws ServletException {
        WebApplicationContext appCtx = WebApplicationContextUtils
                .getWebApplicationContext(getServletContext());
        captchaService = (ImageCaptchaService) BeanFactoryUtils
                .beanOfTypeIncludingAncestors(appCtx, ImageCaptchaService.class);
        
    }

    @Override
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) 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 = request.getSession().getId();
            BufferedImage challenge = captchaService.getImageChallengeForID(
                    captchaId, request.getLocale());
            // Jimi.putImage("image/jpeg", challenge, jpegOutputStream);
            ImageIO.write(challenge, CAPTCHA_IMAGE_FORMAT, jpegOutputStream);
        } catch (IllegalArgumentException e) {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        } catch (CaptchaServiceException e) {
            response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            return;
        }
        // catch (JimiException 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/" + CAPTCHA_IMAGE_FORMAT);

        ServletOutputStream responseOutputStream = response.getOutputStream();
        responseOutputStream.write(captchaChallengeAsJpeg);
        responseOutputStream.flush();
        responseOutputStream.close();
    }
}

刚开始写，也不知道怎么样，就先这样吧。记录一下自己在工作中遇到的一些技术或问题。