若依自帶的驗證碼樣式比較單一，所以想改用EasyCaptcha驗證碼，另外EasyCaptcha算術驗證碼可能會有負數，輸入時需要寫負號，比較麻煩，所以使用一個簡單的方法過濾掉負數結果

原本的驗證碼依賴和代碼可刪可不刪，注釋掉即可

1. 在父模塊添加依賴

   <properties><captcha.version>1.6.2</captcha.version>
   </properties><dependencyManagement><dependencies>
   <!-- EasyCaptcha驗證碼依賴  --><dependency><groupId>com.github.whvcse</groupId><artifactId>easy-captcha</artifactId><version>${captcha.version}</version></dependency></dependencies>
   </dependencyManagement>
   

   

2. ruoyi-admin模塊中添加依賴

   <!-- 驗證碼 -->
   <dependency><groupId>com.github.whvcse</groupId><artifactId>easy-captcha</artifactId>
   </dependency>
   

   

3. 找到CaptchaController,java，修改getCode方法

   public AjaxResult getCode(HttpServletResponse response) throws IOException, FontFormatException {AjaxResult ajax = AjaxResult.success();boolean captchaEnabled = configService.selectCaptchaEnabled();ajax.put("captchaEnabled", captchaEnabled);if (!captchaEnabled){return ajax;}// 保存驗證碼信息String uuid = IdUtils.simpleUUID();String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;//新驗證碼//圖形驗證碼//SpecCaptcha captcha = new SpecCaptcha(130, 48, 4);//算術驗證碼ArithmeticCaptcha captcha;String code;captcha = new ArithmeticCaptcha(130, 48);//得到驗證碼的值code = captcha.text();//若為負數則重新生成int i = Integer.parseInt(code);while (i < 0){System.out.println("code = " + code + "，負數，重新生成！！！！！！！！");captcha = new ArithmeticCaptcha(130, 48);code = captcha.text();i = Integer.parseInt(code);System.out.println("i = " + i + "，新值！！！");}// 設置內置字體captcha.setFont(Captcha.FONT_1);//captcha.setLen(2);  // 幾位數運算，默認是兩位//captcha.getArithmeticString();  // 獲取運算的公式//存入redisredisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);//舊驗證碼//String capStr = null, code = null;//BufferedImage image = null;// 生成驗證碼//String captchaType = RuoYiConfig.getCaptchaType();//if ("math".equals(captchaType))//{//    String capText = captchaProducerMath.createText();//    capStr = capText.substring(0, capText.lastIndexOf("@"));//    code = capText.substring(capText.lastIndexOf("@") + 1);//    image = captchaProducerMath.createImage(capStr);//}//else if ("char".equals(captchaType))//{//    capStr = code = captchaProducer.createText();//    image = captchaProducer.createImage(capStr);//}////redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES); 轉換流信息寫出//FastByteArrayOutputStream os = new FastByteArrayOutputStream();//try//{//    ImageIO.write(image, "jpg", os);//}//catch (IOException e)//{//    return AjaxResult.error(e.getMessage());//}ajax.put("uuid", uuid);ajax.put("img", captcha.toBase64());return ajax;}
   

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