diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/exception/EntityNotFoundException.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/exception/EntityNotFoundException.java
new file mode 100644
index 00000000..8ea360e2
--- /dev/null
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/exception/EntityNotFoundException.java
@@ -0,0 +1,19 @@
+package com.qqchen.deploy.backend.framework.exception;
+
+import com.qqchen.deploy.backend.framework.enums.ResponseCode;
+import java.io.Serializable;
+
+public class EntityNotFoundException extends BusinessException {
+    
+    public EntityNotFoundException(Serializable id) {
+        super(ResponseCode.DATA_NOT_FOUND, new Object[]{id});
+    }
+    
+    public EntityNotFoundException(String message) {
+        super(ResponseCode.DATA_NOT_FOUND, new Object[]{message});
+    }
+    
+    public EntityNotFoundException(String entityName, Serializable id) {
+        super(ResponseCode.DATA_NOT_FOUND, new Object[]{entityName, id});
+    }
+} 
\ No newline at end of file
diff --git a/backend/src/main/java/com/qqchen/deploy/backend/framework/security/SecurityUtils.java b/backend/src/main/java/com/qqchen/deploy/backend/framework/security/SecurityUtils.java
new file mode 100644
index 00000000..ab157039
--- /dev/null
+++ b/backend/src/main/java/com/qqchen/deploy/backend/framework/security/SecurityUtils.java
@@ -0,0 +1,57 @@
+package com.qqchen.deploy.backend.framework.security;
+
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.context.SecurityContextHolder;
+import org.springframework.security.core.userdetails.UserDetails;
+
+public class SecurityUtils {
+    
+    /**
+     * 获取当前登录用户名
+     */
+    public static String getCurrentUsername() {
+        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
+        if (authentication == null || !authentication.isAuthenticated()) {
+            return "SYSTEM";
+        }
+        
+        Object principal = authentication.getPrincipal();
+        if (principal instanceof UserDetails) {
+            return ((UserDetails) principal).getUsername();
+        }
+        return principal.toString();
+    }
+    
+    /**
+     * 检查是否有指定权限
+     */
+    public static boolean hasPermission(String permission) {
+        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
+        return authentication != null && 
+               authentication.isAuthenticated() && 
+               authentication.getAuthorities().stream()
+                   .anyMatch(auth -> auth.getAuthority().equals(permission));
+    }
+    
+    /**
+     * 获取当前用户ID
+     */
+    public static Long getCurrentUserId() {
+        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
+        if (authentication != null && authentication.isAuthenticated()) {
+            Object principal = authentication.getPrincipal();
+            if (principal instanceof UserDetails) {
+                return Long.valueOf(((UserDetails) principal).getUsername());
+            }
+        }
+        return null;
+    }
+    
+    /**
+     * 检查是否已认证
+     */
+    public static boolean isAuthenticated() {
+        Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
+        return authentication != null && authentication.isAuthenticated();
+    }
+} 
\ No newline at end of file