From 1302ec09b5b2def90b3f22496d4b55c3b3f9ab81 Mon Sep 17 00:00:00 2001
From: wanghu <wanghu@yunhai.com>
Date: Wed, 19 Aug 2026 20:22:40 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8Dredis=20=E6=97=B6=E9=97=B4?=
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---
 .../controller/api/CacheController.java       | 41 +++++++++++++++++++
 1 file changed, 41 insertions(+)

diff --git a/src/main/java/com/yunhai/bschclassmanage/controller/api/CacheController.java b/src/main/java/com/yunhai/bschclassmanage/controller/api/CacheController.java
index 26775e7..46c4916 100644
--- a/src/main/java/com/yunhai/bschclassmanage/controller/api/CacheController.java
+++ b/src/main/java/com/yunhai/bschclassmanage/controller/api/CacheController.java
@@ -10,6 +10,7 @@ import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.data.redis.core.RedisTemplate;
+import org.springframework.data.redis.serializer.RedisSerializer;
 import org.springframework.web.bind.annotation.*;
 
 import java.util.Arrays;
@@ -96,9 +97,49 @@ public class CacheController extends BaseController {
                 break;
         }
         result.put("value", value);
+
+        // 缓存值大小（字节）：用 ValueSerializer 重新序列化得到实际存储体积
+        long size = 0;
+        try {
+            @SuppressWarnings("unchecked")
+            RedisSerializer<Object> valueSerializer = (RedisSerializer<Object>) redisTemplate.getValueSerializer();
+            if (valueSerializer != null && value != null) {
+                byte[] raw = valueSerializer.serialize(value);
+                size = (raw != null) ? raw.length : 0;
+            }
+        } catch (Exception ignore) {
+            size = 0;
+        }
+        result.put("size", size);
+
+        // 可读过期时间（expire 仍为原始秒：-1 永不过期，-2 不存在）
+        long ttl = redisTemplate.getExpire(key, TimeUnit.SECONDS);
+        result.put("expireText", formatTtl(ttl));
         return result;
     }
 
+    /**
+     * 将剩余秒数格式化为可读文本
+     */
+    private String formatTtl(long ttl) {
+        if (ttl == -1) {
+            return "永不过期";
+        }
+        if (ttl == -2) {
+            return "已过期/不存在";
+        }
+        if (ttl < 60) {
+            return ttl + " 秒";
+        }
+        if (ttl < 3600) {
+            return (ttl / 60) + " 分 " + (ttl % 60) + " 秒";
+        }
+        if (ttl < 86400) {
+            return (ttl / 3600) + " 小时 " + ((ttl % 3600) / 60) + " 分";
+        }
+        return (ttl / 86400) + " 天 " + ((ttl % 86400) / 3600) + " 小时";
+    }
+
     /**
      * 根据模式匹配查询 key 列表（如 school_class_*），方便先找到 key 再查看内容
      *