• 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>
    View Code

     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>
    View Code

    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>
    View Code

    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();
        }
    }
    View Code

    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。

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  • 原文地址:https://www.cnblogs.com/fan-lp/p/5157414.html
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