用户封禁拦截器，登录验证完成

src/main/java/com/bao/dating/util/UserBanUtil.java

@@ -0,0 +1,43 @@
+package com.bao.dating.util;
+
+import com.bao.dating.context.UserContext;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.stereotype.Component;
+
+/**
+ * 用户封禁验证工具类
+ * 提供统一的用户封禁状态检查功能
+ *
+ * @author KilLze
+ */
+@Component
+public class UserBanUtil {
+
+    @Autowired
+    private RedisTemplate<String, Object> redisTemplate;
+
+    /**
+     * 验证指定用户是否被封禁
+     *
+     * @param userId 用户ID
+     * @throws RuntimeException 如果用户被封禁则抛出异常
+     */
+    public void validateUserNotBanned(Long userId) {
+        String banKey = "user:ban:" + userId;
+        if (Boolean.TRUE.equals(redisTemplate.hasKey(banKey))) {
+            String reason = (String) redisTemplate.opsForValue().get(banKey);
+            throw new RuntimeException("账号已被封禁：" + reason);
+        }
+    }
+
+    /**
+     * 验证当前登录用户是否被封禁
+     *
+     * @throws RuntimeException 如果用户被封禁则抛出异常
+     */
+    public void validateCurrentUserNotBanned() {
+        Long userId = UserContext.getUserId();
+        validateUserNotBanned(userId);
+    }
+}