String capStr = null, code = null;BufferedImage image = null;

// 生成验证码if ("math".equals(captchaType)){ String capText = captchaProducerMath.createText(); capStr = capText.substring(0, capText.lastIndexOf("@")); code = capText.substring(capText.lastIndexOf("@") + 1); image = captchaProducerMath.createImage(capStr);}else if ("char".equals(captchaType)){ capStr = code = captchaProducer.createText(); image = captchaProducer.createImage(capStr);}

redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);// 转换流信息写出FastByteArrayOutputStream os = new FastByteArrayOutputStream();try{ ImageIO.write(image, "jpg", os);}catch (IOException e){ return AjaxResult.error(e.getMessage());}

ajax.put("uuid", uuid);ajax.put("img", Base64.encode(os.toByteArray()));return ajax;