ValidateCode生成验证码

可用于生成这样的验证码：

需要下载ValidateCode.jar

参考代码：

@RequestMapping("get_verification_code")
public void getVerificationCode(HttpSession session, HttpServletResponse response,
                            @RequestParam(defaultValue = "100") int width, @RequestParam(defaultValue = "30") int height,
                            @RequestParam(defaultValue = "4") int codeCount, @RequestParam(defaultValue = "6") int lineCount) throws IOException {
    ValidateCode validateCode = new ValidateCode(width, height, codeCount, lineCount);
    String code = validateCode.getCode().toLowerCase();
    System.out.println("验证码是：" + code);
    session.setAttribute(SessionKeyConst.VERIFICATION_CODE, code);
    validateCode.write(response.getOutputStream());
}