使用google的DefaultKaptcha生成验证码

落日映苍穹つ 2022-02-01 08:43 418阅读 0赞

### 配置生成规则 ###

<bean id="captchaProducer" class="com.google.code.kaptcha.impl.DefaultKaptcha">
            <property name="config">
                <bean class="com.google.code.kaptcha.util.Config">
                    <constructor-arg>
                        <props>
                            
                            <prop key="kaptcha.border">no</prop>
                            
                            <prop key="kaptcha.image.width">95</prop>
                            
                            <prop key="kaptcha.image.height">45</prop>
                            
                            <prop key="kaptcha.background.clear.from">248,248,248</prop>
                            
                            <prop key="kaptcha.background.clear.to">248,248,248</prop>
                            
                            <prop key="kaptcha.textproducer.char.string">
                                0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
                            </prop>
                            
                            <prop key="kaptcha.textproducer.font.color">0,0,255</prop>
                            
                            <prop key="kaptcha.obscurificator.impl">
                                com.google.code.kaptcha.impl.ShadowGimpy
                            </prop>
                            
                            <prop key="kaptcha.textproducer.font.size">35</prop>
                            
                            <prop key="kaptcha.textproducer.char.length">4</prop>
                            
                            <prop key="kaptcha.textproducer.char.space">2</prop>
                            
                            <prop key="kaptcha.textproducer.font.names">
                                new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize)
                            </prop>
                            
                            <prop key="kaptcha.noise.impl">com.google.code.kaptcha.impl.NoNoise</prop>
                        </props>
                    </constructor-arg>
                </bean>
            </property>
        </bean>

### 使用方法 ###

/**
         * 生成带验证码的图片
         */
        @GetMapping(value = "/getCaptchaImage.pub")
        public void getCaptchaImage(HttpServletRequest request, HttpServletResponse response) throws IOException {
            response.setDateHeader("Expires", 0);
            response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
            response.addHeader("Cache-Control", "post-check=0, pre-check=0");
            response.setHeader("Pragma", "no-cache");
            response.setContentType("image/jpeg");
            String capText = captchaProducer.createText();
    
            request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
            request.getSession().setAttribute(Constants.KAPTCHA_SESSION_DATE, new Date());
            BufferedImage bi = captchaProducer.createImage(capText);
            try (ServletOutputStream out = response.getOutputStream()) {
                ImageIO.write(bi, "jpeg", out);
                out.flush();
            }
        }