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。
