update 优化 验证码结果使用spel引擎自动计算

ruoyi-gateway/src/main/java/com/ruoyi/gateway/service/impl/ValidateCodeServiceImpl.java

@@ -2,7 +2,6 @@ package com.ruoyi.gateway.service.impl;
 
 import cn.hutool.captcha.AbstractCaptcha;
 import cn.hutool.captcha.generator.CodeGenerator;
-import cn.hutool.core.convert.Convert;
 import cn.hutool.core.util.IdUtil;
 import com.ruoyi.common.core.constant.CacheConstants;
 import com.ruoyi.common.core.constant.Constants;
@@ -17,6 +16,9 @@ import com.ruoyi.gateway.config.properties.CaptchaProperties;
 import com.ruoyi.gateway.enums.CaptchaType;
 import com.ruoyi.gateway.service.ValidateCodeService;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.expression.Expression;
+import org.springframework.expression.ExpressionParser;
+import org.springframework.expression.spel.standard.SpelExpressionParser;
 import org.springframework.stereotype.Service;
 
 import java.io.IOException;
@@ -57,30 +59,18 @@ public class ValidateCodeServiceImpl implements ValidateCodeService {
         AbstractCaptcha captcha = SpringUtils.getBean(captchaProperties.getCategory().getClazz());
         captcha.setGenerator(codeGenerator);
         captcha.createCode();
-        String code = isMath ? getCodeResult(captcha.getCode()) : captcha.getCode();
+        String code = captcha.getCode();
+        if (isMath) {
+            ExpressionParser parser = new SpelExpressionParser();
+            Expression exp = parser.parseExpression(StringUtils.remove(code, "="));
+            code = exp.getValue(String.class);
+        }
         RedisUtils.setCacheObject(verifyKey, code, Duration.ofMinutes(Constants.CAPTCHA_EXPIRATION));
         ajax.put("uuid", uuid);
         ajax.put("img", captcha.getImageBase64());
         return R.ok(ajax);
     }
 
-    private String getCodeResult(String capStr) {
-        int numberLength = captchaProperties.getNumberLength();
-        int a = Convert.toInt(StringUtils.substring(capStr, 0, numberLength).trim());
-        char operator = capStr.charAt(numberLength);
-        int b = Convert.toInt(StringUtils.substring(capStr, numberLength + 1, numberLength + 1 + numberLength).trim());
-        switch (operator) {
-            case '*':
-                return Convert.toStr(a * b);
-            case '+':
-                return Convert.toStr(a + b);
-            case '-':
-                return Convert.toStr(a - b);
-            default:
-                return StringUtils.EMPTY;
-        }
-    }
-
     /**
      * 校验验证码
      */