diff --git a/das/src/main/java/com/das/common/captcha/CaptchaUtil.java b/das/src/main/java/com/das/common/captcha/CaptchaUtil.java
index 1f3d94d4..ef1083dc 100644
--- a/das/src/main/java/com/das/common/captcha/CaptchaUtil.java
+++ b/das/src/main/java/com/das/common/captcha/CaptchaUtil.java
@@ -31,10 +31,7 @@ public class CaptchaUtil {
     public static boolean checkVerificationCode(String uuid, String codeAnswer, AdminRedisTemplate adminRedisTemplate){
         String verifyKey = AdminConstant.CAPTCHA_CODE_KEY + uuid;
         String answer = adminRedisTemplate.get(verifyKey);
-        if (StrUtil.isNotEmpty(codeAnswer) && answer != null && answer.equals(codeAnswer)){
-            return true;
-        }
-        return false;
+        return StrUtil.isNotEmpty(codeAnswer) && answer != null && answer.equals(codeAnswer);
     }
 
     /**
diff --git a/das/src/main/java/com/das/common/interceptor/DecryptingOncePerRequestFilter.java b/das/src/main/java/com/das/common/interceptor/DecryptingOncePerRequestFilter.java
index da984f54..e5d20db5 100644
--- a/das/src/main/java/com/das/common/interceptor/DecryptingOncePerRequestFilter.java
+++ b/das/src/main/java/com/das/common/interceptor/DecryptingOncePerRequestFilter.java
@@ -30,7 +30,7 @@ import static org.springframework.http.HttpMethod.POST;
 
 public class DecryptingOncePerRequestFilter extends OncePerRequestFilter {
 
-    private String aesKey;
+    private final String aesKey;
     public DecryptingOncePerRequestFilter(String aesKey) {
         this.aesKey = aesKey;
     }
diff --git a/das/src/main/java/com/das/common/interceptor/TokenUpdatingHttpServletRequestWrapper.java b/das/src/main/java/com/das/common/interceptor/TokenUpdatingHttpServletRequestWrapper.java
index 2f7a3262..446b1868 100644
--- a/das/src/main/java/com/das/common/interceptor/TokenUpdatingHttpServletRequestWrapper.java
+++ b/das/src/main/java/com/das/common/interceptor/TokenUpdatingHttpServletRequestWrapper.java
@@ -8,7 +8,7 @@ import java.util.Enumeration;
 
 public class TokenUpdatingHttpServletRequestWrapper extends HttpServletRequestWrapper {
 
-    private String newTokenValue;
+    private final String newTokenValue;
 
     public TokenUpdatingHttpServletRequestWrapper(HttpServletRequest request, String newTokenValue) {
         super(request);
@@ -31,4 +31,4 @@ public class TokenUpdatingHttpServletRequestWrapper extends HttpServletRequestWr
         return super.getHeaders(name); // 对于其他header，委托给父类处理
     }
 
-}
\ No newline at end of file
+}
diff --git a/das/src/main/java/com/das/common/log/MdcExecutor.java b/das/src/main/java/com/das/common/log/MdcExecutor.java
index 5e1a0143..00cd9cc2 100644
--- a/das/src/main/java/com/das/common/log/MdcExecutor.java
+++ b/das/src/main/java/com/das/common/log/MdcExecutor.java
@@ -12,7 +12,7 @@ import java.util.concurrent.Executor;
 @Slf4j
 public class MdcExecutor implements Executor {
 
-    private Executor executor;
+    private final Executor executor;
 
     public MdcExecutor(Executor executor) {
         this.executor = executor;
diff --git a/das/src/main/java/com/das/common/utils/JsonUtils.java b/das/src/main/java/com/das/common/utils/JsonUtils.java
index dd00b764..636457c0 100644
--- a/das/src/main/java/com/das/common/utils/JsonUtils.java
+++ b/das/src/main/java/com/das/common/utils/JsonUtils.java
@@ -21,7 +21,7 @@ import java.util.List;
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 public class JsonUtils {
 
-    private static ObjectMapper OBJECT_MAPPER = SpringUtils.getBean(ObjectMapper.class);
+    private static final ObjectMapper OBJECT_MAPPER = SpringUtils.getBean(ObjectMapper.class);
 
     public static ObjectMapper getObjectMapper() {
         return OBJECT_MAPPER;