Kaptcha生成验证码

基本步骤

• 导入jar包

• 编写Kaptcha配置类

  @Configuration
  public class KaptchaConfig {
      @Bean
      public Producer kaptchaProducer() {
          Properties properties = new Properties();
          properties.setProperty("kaptcha.image.width", "100");
          properties.setProperty("kaptcha.image.height", "40");
          properties.setProperty("kaptcha.textproducer.font.size", "32");
          properties.setProperty("kaptcha.textproducer.char.string", "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ");
          properties.setProperty("kaptcha.textproducer.char.length", "4");
          properties.setProperty("kaptcha.noise.impl", "com.google.code.kaptcha.impl.NoNoise");
  
          DefaultKaptcha kaptcha = new DefaultKaptcha();
          Config config = new Config(properties);
          kaptcha.setConfig(config);
          return kaptcha;
      }
  }

• 引入bean，生成随机字符，生成图片

  @RequestMapping(path="/kaptcha", method = RequestMethod.GET)
  public void getKaptcha(HttpServletResponse response, HttpSession session) {
      //生成验证码
      String text = kaptchaProducer.createText();
      BufferedImage image = kaptchaProducer.createImage(text);
  
      //存入session
      session.setAttribute("kaptcha", image);
  
      //将图片输出给浏览器
      response.setContentType("image/png");
      try {
          OutputStream os = response.getOutputStream();
          ImageIO.write(image, "png", os);
      } catch (IOException e) {
          logger.error("响应验证码失败" + e.getMessage());
      }
  }