Spring|9、springboot 集成 kaptcha验证码 Spring|系列

kaptcha： https://github.com/penggle/kaptcha
基于 SimpleCaptcha 开发的验证码插件，google开源插件 1、引入kaptcha maven依赖
kaptcha 依赖

com.github.penggle
kaptcha
2.3.2

2、构建 kaptcha 配置类，并添加@Configuration 注解

springboot启动时会自动读取配置参数，并将DefaultKaptcha 实例 captchaProducer 注入到spring容器中
验证码样式及格式在配置参数中设置

kaptcha 配置类

/**
* @author changneng
* @version 1.0
* @title: KaptchaConfig
* @description: Kaptcha 验证码配置类
* @date 2019/4/1216:47
*/
@Configuration
public class KaptchaConfig {
@Bean
public DefaultKaptcha getDefaultKaptcha(){
DefaultKaptcha captchaProducer = new

DefaultKaptcha();

Properties properties = new

Properties();

/**
* @description: 设置 Kaptcha 生成验证码格式
* @param []
* @return com.google.code.kaptcha.impl.DefaultKaptcha
* @author changneng
【Spring|9、springboot 集成 kaptcha验证码】* @date 2019/4/12 16:53
* @version 1.0
*/
properties.setProperty("kaptcha.textproducer.font.color", "blue"

);

properties.setProperty("kaptcha.textproducer.char.length", "4"

);

properties.setProperty("kaptcha.textproducer.font.size", "30"

);

properties.setProperty("kaptcha.image.width", "120"

);

properties.setProperty("kaptcha.image.height", "40"

);

properties.setProperty("kaptcha.textproducer.char.space", "6"

);

properties.setProperty("kaptcha.textproducer.font.names", "Arial, Courier"

);

Config config = new

Config(properties);

captchaProducer.setConfig(config);

return

captchaProducer;

}
}

3、构建kaptcha 验证码的controller 方法，以流的形式返回给客户端（登录页面）

kaptcha 提供验证码服务

/**
* @description: TODO
* @param
* @return
* @author changneng
* @date 2019/4/12 16:27
* @version 1.0
*/
@RequestMapping(value=https://www.it610.com/article/"/getKaptcha", method = RequestMethod.GET)
public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {

HttpSession session = request.getSession();

String code = (String)session.getAttribute(Constants.KAPTCHA_SESSION_KEY);

System.out.println("******************上次的验证码是: " + code + "******************"

);

// 设置浏览器不要对数据进行缓存
response.setDateHeader("Expires", 0

);

// Set standard HTTP/1.1 no-cache headers.
response.setHeader("Cache-Control","no-store, no-cache, must-revalidate"

);

// Set IE extended HTTP/1.1 no-cache headers (use addHeader).
response.addHeader("Cache-Control", "post-check=0, pre-check=0"

);

// Set standard HTTP/1.0 no-cache header.
response.setHeader("Pragma", "no-cache"

);

// return a jpeg
response.setContentType("image/jpeg"

);

// create the text for the image

String capText =captchaProducer.createText();

// store the text in the session

session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);

//settimg time out
session.setMaxInactiveInterval(120

);

System.out.println("session中验证码的超时时间是："+session.getMaxInactiveInterval()+" seconds"

);

System.out.println("******************本次的验证码是: " + capText + "******************"

);

// create the image with the text

BufferedImage bi = captchaProducer.createImage(capText);

ServletOutputStream out = response.getOutputStream();

// write the data out
ImageIO.write(bi, "jpg"

, out);

try {

out.flush();

} finally {

out.close();

}
}

4、kaptcha 验证码校验
从session中获取验证码：String code = (String)session.getAttribute(Constants.KAPTCHA_SESSION_KEY);
从登录请求中获取用户输入的验证码：request.getParameter("authCode")
二者比较即可
5、总结