How to prevent malicious registration in Java

Malicious registration usually refers to the use of automated scripts or robots to conduct a large number of registrations in a short period of time. This behavior will put pressure on the system and even cause system paralysis. In order to solve this problem, the following measures can be taken:

1. Add verification code

In order to prevent robots or automated scripts from registering, you can add verification codes on the registration page. This way only human users can pass the CAPTCHA verification.

// 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";
}

2. IP restriction

You can restrict the IP address from which registration behavior comes. If an IP address has too many registrations in a short period of time, you can restrict the IP address, for example, restricting the IP address from being able to register for a period of time.

// 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;
}

3. Add sliding verification

In addition to the verification code, you can also use sliding verification to prevent malicious registration by robots. Swipe verification requires a manual swipe from the user, a behavior that bots cannot simulate.

// 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)

4. Add email verification

In order to ensure that the registration behavior is performed by a valid email address, you can send an email to the user for verification after the user successfully registers. Only users who have passed email verification can perform normal operations.

// 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";
}

5. Add blacklist

If it is found that a user has performed malicious registration behavior, the user's information can be added to the blacklist, and future registration behavior will be prohibited.

// 将恶意用户添加到黑名单中
@RequestMapping(value = "/register", method = RequestMethod.POST)
public String register(User user) {
    if (blacklistService.isBlacklisted(user)) {
        return "blacklist";
    }
    userService.register(user);
    return "success";
}

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