１、从jcaptcha官方网站下载jcaptcha的发行包，并将其发行包中的jar文件考贝到本地项目WEB-INF目录下的lib目录中。
官方网址http://jcaptcha.sourceforge.net/
２、在web.xml文件中配置
<servlet>
<servlet-name>jcaptcha</servlet-name>
<servlet-class>cn.hxex.order.core.jcaptcha.ImageCaptchaServlet</servlet-class>
<load-on-startup>3</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>jcaptcha</servlet-name>
<url-pattern>/captcha.jpg</url-pattern>
</servlet-mapping>
３、jcaptcha在spring中的配置
<bean id="channelProcessingFilter"
class="org.acegisecurity.securechannel.ChannelProcessingFilter">
<property name="channelDecisionManager">
<ref local="channelDecisionManager"/>
</property>
<property name="filterInvocationDefinitionSource">
<value>
CONVERT_URL_TO_LOWERCASE_BEFORE_COMPARISON
PATTERN_TYPE_APACHE_ANT
/j_security_check=REQUIRES_CAPTCHA_ONCE_ABOVE_THRESOLD_REQUESTS
</value>
</property>
</bean>
<bean id="channelDecisionManager"
class="org.acegisecurity.securechannel.ChannelDecisionManagerImpl">
<property name="channelProcessors">
<list>
<ref local="testOnceAfterMaxRequestsCaptchaChannelProcessor"/>
<ref local="alwaysTestAfterTimeInMillisCaptchaChannelProcessor"/>
<ref local="alwaysTestAfterMaxRequestsCaptchaChannelProcessor"/>
<ref local="alwaysTestBelowAverageTimeInMillisBetweenRequestsChannelProcessor"/>
</list>
</property>
</bean>
<!-- REQUIRES_CAPTCHA_ONCE_ABOVE_THRESOLD_REQUESTS -->
<bean id="testOnceAfterMaxRequestsCaptchaChannelProcessor"
class="org.acegisecurity.captcha.TestOnceAfterMaxRequestsCaptchaChannelProcessor">
<property name="thresold">
<value>0</value>
</property>
<property name="entryPoint">
<ref bean="captchaEntryPoint"/>
</property>
</bean>
<!-- REQUIRES_CAPTCHA_ABOVE_THRESOLD_REQUESTS -->
<bean id="alwaysTestAfterMaxRequestsCaptchaChannelProcessor"
class="org.acegisecurity.captcha.AlwaysTestAfterMaxRequestsCaptchaChannelProcessor">
<property name="thresold">
<value>5</value>
</property>
<property name="entryPoint">
<ref bean="captchaEntryPoint"/>
</property>
</bean>
<!-- REQUIRES_CAPTCHA_AFTER_THRESOLD_IN_MILLIS -->
<bean id="alwaysTestAfterTimeInMillisCaptchaChannelProcessor"
class="org.acegisecurity.captcha.AlwaysTestAfterTimeInMillisCaptchaChannelProcessor">
<property name="thresold">
<value>5000</value>
</property>
<property name="entryPoint">
<ref bean="captchaEntryPoint"/>
</property>
</bean>
<!-- REQUIRES_CAPTCHA_BELOW_AVERAGE_TIME_IN_MILLIS_REQUESTS -->
<bean
id="alwaysTestBelowAverageTimeInMillisBetweenRequestsChannelProcessor"
class="org.acegisecurity.captcha.AlwaysTestBelowAverageTimeInMillisBetweenRequestsChannelProcessor">
<property name="thresold">
<value>20000</value>
</property>
<property name="entryPoint">
<ref bean="captchaEntryPoint"/>
</property>
</bean>
<bean id="captchaEntryPoint"
class="org.acegisecurity.captcha.CaptchaEntryPoint">
<!--验证码验证失败后转向的页面!-->
<property name="captchaFormUrl">
<value>/admin/login.jsp?login_error=code_error</value>
</property>
<property name="includeOriginalRequest">
<value>false</value>
</property>
<property name="includeOriginalParameters">
<value>false</value>
</property>
</bean>
<bean id="captchaValidationProcessingFilter"
class="org.acegisecurity.captcha.CaptchaValidationProcessingFilter">
<property name="captchaService">
<ref bean="captchaService"/>
</property>
<property name="captchaValidationParameter" value="j_captcha_response"/>
</bean>
<!-- imageCaptchaService is injected into captchaImageCreateController as well as to captchaService beans -->
<!--自己定义的实体类（注意路径！！）-->
<bean id="captchaService" class="cn.hxex.order.core.jcaptcha.JCaptchaServiceProxyImpl">
<property name="jcaptchaService" ref="imageCaptchaService"/>
</bean>
<bean id="imageCaptchaService" class="com.octo.captcha.service.image.DefaultManageableImageCaptchaService">
<constructor-arg type="com.octo.captcha.service.captchastore.CaptchaStore" index="0">
<ref bean="fastHashMapCaptchaStore"/>
</constructor-arg>
<!-- (1) which captcha Engine you use -->
<constructor-arg type="com.octo.captcha.engine.CaptchaEngine" index="1">
<ref bean="captchaEngineEx"/>
</constructor-arg>
<constructor-arg index="2">
<value>180</value>
</constructor-arg>
<constructor-arg index="3">
<value>100000</value>
</constructor-arg>
<constructor-arg index="4">
<value>75000</value>
</constructor-arg>
</bean>
<bean id="fastHashMapCaptchaStore" class="com.octo.captcha.service.captchastore.FastHashMapCaptchaStore"/>
<!-- (2) you can define more than one captcha engine here -->
<bean id="captchaEngineEx"
class="cn.hxex.order.core.jcaptcha.engine.CaptchaEngineEx">
</bean>
<bean id="filterChainProxy"
class="org.acegisecurity.util.FilterChainProxy">
<property name="filterInvocationDefinitionSource">
<value>
CONVERT_URL_TO_LOWERCASE_BEFORE_COMPARISON
PATTERN_TYPE_APACHE_ANT
/**=httpSessionContextIntegrationFilter,captchaValidationProcessingFilter,channelProcessingFilter,authenticationProcessingFilter,exceptionTranslationFilter,filterInvocationInterceptor
</value>
</property>
</bean>
<bean id="httpSessionContextIntegrationFilter"
class="org.acegisecurity.context.HttpSessionContextIntegrationFilter">
<!-- 将下面的property注释掉，验证码将无效！！！ -->
<property name="context">
<value>
org.acegisecurity.captcha.CaptchaSecurityContextImpl
</value>
</property>
</bean>
·············省略了一些spring安全框架的bean，自己加去吧
４、编写jcaptcha的实体类
实体类包的路径一定要和spring配置文件里的路径一样
（１）CaptchaEngine 类
package cn.hxex.order.core.jcaptcha.engine;
import java.awt.Color;
import com.octo.captcha.component.image.backgroundgenerator.BackgroundGenerator;
import com.octo.captcha.component.image.backgroundgenerator
.FunkyBackgroundGenerator;
import com.octo.captcha.component.image.fontgenerator.FontGenerator;
import com.octo.captcha.component.image.fontgenerator
.TwistedAndShearedRandomFontGenerator;
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;
/**
* SpringSide Custom的认证图片
*
* @author cac
*/
public class CaptchaEngine extends ListImageCaptchaEngine {
/**
* @see ListImageCaptchaEngine
*/
protected void buildInitialFactories() {
WordGenerator wordGenerator
= new RandomWordGenerator("023456789");
// nteger minAcceptedWordLength, Integer maxAcceptedWordLength,Color[]
// textColors
TextPaster textPaster = new RandomTextPaster(4,5, Color.WHITE);
// Integer width, Integer height
BackgroundGenerator backgroundGenerator
= new FunkyBackgroundGenerator(100,40);
// Integer minFontSize, Integer maxFontSize
FontGenerator fontGenerator = new TwistedAndShearedRandomFontGenerator(20, 22);
WordToImage wordToImage = new ComposedWordToImage(fontGenerator,
backgroundGenerator, textPaster);
addFactory(new GimpyFactory(wordGenerator, wordToImage));
}
}
（２）CaptchaEngineEx 类
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