开源组件Kaptcha实现验证码的详细配置：
<servlet> 
<servlet-name>Kaptcha</servlet-name> 
<servlet-class&le.code.kaptcha.servlet.KaptchaServlet</servlet-class> 
<init-param> 
<description> Border around kaptcha. Legal values are yes or no. </description> 
<param-name>kaptcha.border</param-name> 
<param-value>no</param-value> 
</init-param> 
<init-param> 
<description>Color of the border. Legal values are r,g,b (and optional alpha) or white,black,blue. </description> 
<param-name>lor</param-name> 
<param-value>red</param-value> 
</init-param> 
<init-param> 
<description>Thickness of the border around kaptcha. Legal values are > 0. </description> 
<param-name>kaptcha.border.thickness</param-name> 
<param-value>5</param-value> 
</init-param> 
<init-param> 
<description>Width in pixels of the kaptcha image. </description> 
<param-name>kaptcha.image.width</param-name> 
<param-value>80</param-value> 
</init-param> 
<init-param> 
<description>Height in pixels of the kaptcha image. </description> 
<param-name>kaptcha.image.height</param-name> 
<param-value>40</param-value> 
</init-param> 
<init-param> 
<description>The image producer. </description> 
<param-name>kaptcha.producer.impl</param-name> 
<param-value&le.code.kaptcha.impl.DefaultKaptcha </param-value> 
</init-param> 
<init-param> 
<description>The text producer. </description> 
<param-name&producer.impl</param-name> 
<param-value&le.impl.DefaultTextCreator</param-value> 
</init-param> 
<init-param> 
<description>The characters that will create the kaptcha. </description> 
<param-name&producer.char.string</param-name> 
<param-value>abcde2345678gfynmnpwx </param-value> 
</init-param> 
<init-param> 
<description>The number of characters to display. </description> 
<param-name&producer.char.length</param-name> 
<param-value>5</param-value> 
</init-param> 
<init-param> 
<description>A list of comma separated font names.</description> 
<param-name&producer.font.names</param-name> 
<param-value>Arial, Courier</param-value> 
</init-param> 
<init-param> 
<description>The size of the font to use. </description> 
<param-name&producer.font.size</param-name> 
<param-value>23</param-value> 
</init-param> 
<init-param> 
<description>The color to use for the font. Legal values are r,g,b. </description> 
<param-name&lor</param-name> 
<param-value>black</param-value> 
</init-param> 
<init-param> 
<description>The noise producer. </description> 
<param-name&ise.impl</param-name> 
<param-value&le.code.kaptcha.impl.NoNoise </param-value> 
</init-param> 
<init-param> 
<description>The noise color. Legal values are r,g,b. </description> 
<param-name&lor</param-name> 
<param-value>black</param-value> 
</init-param> 
<init-param> 
<description>The obscurificator implementation. </description> 
<param-name>kaptcha.obscurificator.impl</param-name> 
<param-value&le.code.kaptcha.impl.ShadowGimpy</param-value> 
</init-param> 
<init-param> 
<description>The background implementation. </description> 
<param-name>kaptcha.background.impl</param-name> 
<param-value&le.code.kaptcha.impl.DefaultBackground</param-value> 
</init-param> 
<init-param> 
<description>Ending background color. Legal values are r,g,b. </description> 
<param-name>kaptcha.</param-name> 
<param-value>white</param-value> 
param name
</init-param> 
<init-param> 
<description>The word renderer implementation. </description> 
<param-name>kaptcha.word.impl</param-name> 
<param-value&le.impl.DefaultWordRenderer</param-value> 
</init-param> 
<init-param> 
<description>The value for the kaptcha is generated and is put into the HttpSession. This is the key value for that item in the session. </description> 
<param-name>kaptcha.session.key</param-name> 
<param-value>KAPTCHA_SESSION_KEY</param-value> 
</init-param> 
<init-param> 
<description>The date the kaptcha is generated is put into the HttpSession. This is the key value for that item in the session. </description> 
<param-name>kaptcha.session.date</param-name> 
<param-value>KAPTCHA_SESSION_DATE</param-value> 
</init-param> 
</servlet> 
<servlet-mapping> 
<servlet-name>Kaptcha</servlet-name> 
<url-pattern>/Kaptcha.jpg</url-pattern> 
</servlet-mapping> 

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