１、從jcaptcha官方網(wǎng)站下載jcaptcha的發(fā)行包，并將其發(fā)行包中的jar文件考貝到本地項目WEB-INF目錄下的lib目錄中。

官方網(wǎng)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">
        <!--驗證碼驗證失敗后轉(zhuǎn)向的頁面!-->
        <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 -->
　　　<!--自己定義的實體類（注意路徑！！）-->
    <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">
		<!-- 將下面的property注釋掉，驗證碼將無效！！！ -->
		<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、編寫jcaptcha的實體類

實體類包的路徑一定要和spring配置文件里的路徑一樣

（１）CaptchaEngine 類

    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的認證圖片
 * 
 * @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 類

spring+ jcaptcha(spring框架下的彩色驗證碼)