生成图形验证码 将图形验证码流写到前台

ByteArrayOutputStream baos = new ByteArrayOutputStream();
Captcha captcha = createCaptcha();
ImageIO.write(captcha.getImage(), "png", baos);
logger.info("图形验证码生成成功【"+captcha.getWord()+"】");byte[] bytes = baos.toByteArray();
String captCode = getUUIDStr();
JedisPoolClient.getInstance().set(captCode,captcha.getWord(),CAPTCHA_OVERDUE_TIMES);
responseJson.addParam("captcha",bytes);

data:image/png;base64,