javaweb kaptcha的使用

步骤一导入kaptcha的jar包 步骤二在xml中配置servlet

    <servlet>
        <servlet-name>KaptchaServletservlet-name>
        <servlet-class>com.google.code.kaptcha.servlet.KaptchaServletservlet-class>
        
        <init-param>
            <param-name>kaptcha.border.colorparam-name>
            <param-value>redparam-value>
        init-param>
        <init-param>
            <param-name>kaptcha.textproducer.char.stringparam-name>
            <param-value>abcdefgparam-value>
        init-param>
          
    servlet>
    <servlet-mapping>
        <servlet-name>KaptchaServletservlet-name>
        <url-pattern>/kaptcha.jpgurl-pattern>
    servlet-mapping>

步骤三前端写代码测试

<img src="kaptcha.jpg"/>

最后重启tomcat就能看到啦

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分界线 这里是可以选配

public static final String KAPTCHA_SESSION_KEY = "KAPTCHA_SESSION_KEY";
    public static final String KAPTCHA_SESSION_DATE = "KAPTCHA_SESSION_DATE";
    public static final String KAPTCHA_SESSION_CONFIG_KEY = "kaptcha.session.key";
    public static final String KAPTCHA_SESSION_CONFIG_DATE = "kaptcha.session.date";
    public static final String KAPTCHA_BORDER = "kaptcha.border";
    public static final String KAPTCHA_BORDER_COLOR = "kaptcha.border.color";
    public static final String KAPTCHA_BORDER_THICKNESS = "kaptcha.border.thickness";
    public static final String KAPTCHA_NOISE_COLOR = "kaptcha.noise.color";
    public static final String KAPTCHA_NOISE_IMPL = "kaptcha.noise.impl";
    public static final String KAPTCHA_OBSCURIFICATOR_IMPL = "kaptcha.obscurificator.impl";
    public static final String KAPTCHA_PRODUCER_IMPL = "kaptcha.producer.impl";
    public static final String KAPTCHA_TEXTPRODUCER_IMPL = "kaptcha.textproducer.impl";
    public static final String KAPTCHA_TEXTPRODUCER_CHAR_STRING = "kaptcha.textproducer.char.string";
    public static final String KAPTCHA_TEXTPRODUCER_CHAR_LENGTH = "kaptcha.textproducer.char.length";
    public static final String KAPTCHA_TEXTPRODUCER_FONT_NAMES = "kaptcha.textproducer.font.names";
    public static final String KAPTCHA_TEXTPRODUCER_FONT_COLOR = "kaptcha.textproducer.font.color";
    public static final String KAPTCHA_TEXTPRODUCER_FONT_SIZE = "kaptcha.textproducer.font.size";
    public static final String KAPTCHA_TEXTPRODUCER_CHAR_SPACE = "kaptcha.textproducer.char.space";
    public static final String KAPTCHA_WORDRENDERER_IMPL = "kaptcha.word.impl";
    public static final String KAPTCHA_BACKGROUND_IMPL = "kaptcha.background.impl";
    public static final String KAPTCHA_BACKGROUND_CLR_FROM = "kaptcha.background.clear.from";
    public static final String KAPTCHA_BACKGROUND_CLR_TO = "kaptcha.background.clear.to";
    public static final String KAPTCHA_IMAGE_WIDTH = "kaptcha.image.width";
    public static final String KAPTCHA_IMAGE_HEIGHT = "kaptcha.image.height";