EasyCaptcha Java Captcha Library – Features, Integration, and Usage Guide

EasyCaptcha is a Java graphic captcha library that supports GIF, Chinese characters, arithmetic types and can be used in Java Web, Java SE and other projects.

It offers rich visual effects as shown in the screenshots.

To add the library via Maven, include the following dependency:

<dependencies>
   <dependency>
      <groupId>com.github.whvcse</groupId>
      <artifactId>easy-captcha</artifactId>
      <version>1.6.2</version>
   </dependency>
</dependencies>

In a SpringBoot application, you can create a controller to output the captcha image:

@Controller
public class CaptchaController {

    @RequestMapping("/captcha")
    public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
        CaptchaUtil.out(request, response);
    }
}

On the front end, embed the captcha image with an <img> tag pointing to the "/captcha" endpoint: <img src="/captcha" width="130px" height="48px" /> To verify the captcha during login, use CaptchaUtil.ver and clear the session if verification fails:

@Controller
public class LoginController {

    @PostMapping("/login")
    public JsonResult login(String username, String password, String verCode) {
        if (!CaptchaUtil.ver(verCode, request)) {
            CaptchaUtil.clear(request); // clear session captcha
            return JsonResult.error("验证码不正确");
        }
        // ... other login logic ...
    }
}

The source code is available at https://gitee.com/whvse/EasyCaptcha .

Demo screenshots and a live demo are provided at https://tools.cloudbed.vip .

In summary, EasyCaptcha is extremely easy to use, offers a variety of captcha types, supports multiple integration methods, and is recommended for developers seeking a quick and flexible captcha solution.