Bagaimana untuk mengelakkan pendaftaran berniat jahat di Java

// 在注册页面添加验证码
@RequestMapping(value = "/register", method = RequestMethod.GET)
public String showRegisterPage(Model model) {
    Captcha captcha = captchaService.generateCaptcha();
    model.addAttribute("captchaId", captcha.getId());
    return "register";
}

// 验证验证码
@RequestMapping(value = "/register", method = RequestMethod.POST)
public String register(@RequestParam("captchaId") String captchaId, @RequestParam("captcha") String captcha, User user) {
    boolean valid = captchaService.validateCaptcha(captchaId, captcha);
    if (!valid) {
        return "register";
    }
    userService.register(user);
    return "success";
}

// 对 IP 进行限制
public boolean checkIp(String ip) {
    int count = userMapper.countByIp(ip, new Date(System.currentTimeMillis() - 24 * 60 * 60 * 1000)); // 限制一天内的注册行为
    if (count >= 10) { // 如果一个 IP 地址在一天内注册行为超过10次，就禁止该 IP 地址进行注册行为
        return false;
    }
    return true;
}

// 在注册页面添加滑动验证
@RequestMapping(value = "/register", method = RequestMethod.GET)
public String showRegisterPage(Model model) {
    SlideVerify slideVerify = slideVerifyService.generateSlideVerify();
    model.addAttribute("slideVerifyId", slideVerify.getId());
    return "register";
}

// 验证滑动验证
@RequestMapping(value = "/register", method = RequestMethod.POST)
public String register(@RequestParam("slideVerifyId") String slideVerifyId, @RequestParam("slideVerify") String slideVerify, User user)

// 注册成功后发送验证邮件
@RequestMapping(value = "/register", method = RequestMethod.POST)
public String register(User user) {
    userService.register(user);
    emailService.sendValidationEmail(user.getEmail(), user.getValidationCode());
    return "success";
}

// 邮箱验证
@RequestMapping(value = "/validate", method = RequestMethod.GET)
public String validate(@RequestParam("email") String email, @RequestParam("code") String code) {
    userService.validate(email, code);
    return "success";
}