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配置生成规则

       
           
                
                     
                          
                               
                                
        
         no
                                
                                
        
         95
                                
                                
        
         45
                                
                                
        
         248,248,248
                                
                                
        
         248,248,248
                                
                                
        
          0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ 
                                
                                
        
         0,0,255
                                
                                
        
          com.google.code.kaptcha.impl.ShadowGimpy 
                                
                                
        
         35
                                
                                
        
         4
                                
                                
        
         2
                                
                                
        
          new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize) 
                                
                                
        
         com.google.code.kaptcha.impl.NoNoise
                            
                       
                  
             
        
   

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();        }    }

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