javaweb kaptcha的使用

    
        KaptchaServlet
        com.google.code.kaptcha.servlet.KaptchaServlet
        
        
            kaptcha.border.color
            red
        
        
            kaptcha.textproducer.char.string
            abcdefg
        
          
    
    
        KaptchaServlet
        /https://blog.csdn.net/wsy12123_/article/details/kaptcha.jpg
    

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";