diff --git a/web/src/main/java/com/zhehekeji/web/service/CronTab.java b/web/src/main/java/com/zhehekeji/web/service/CronTab.java
index 5313200..336bca7 100644
--- a/web/src/main/java/com/zhehekeji/web/service/CronTab.java
+++ b/web/src/main/java/com/zhehekeji/web/service/CronTab.java
@@ -14,6 +14,7 @@ import org.springframework.scheduling.annotation.EnableScheduling;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 
+import javax.annotation.PostConstruct;
 import javax.annotation.Resource;
 import java.io.File;
 import java.io.IOException;
@@ -51,7 +52,16 @@ public class CronTab {
     @Resource
     private LightSourceService lightSourceService;
 
-    @Scheduled(cron = "0 0 0 * * ?")
+    /**
+     * 软件启动时自动触发一次文件清理
+     */
+    @PostConstruct
+    public void initFileClean() {
+        log.info(" startup file cleanup");
+        file();
+    }
+
+//    @Scheduled(cron = "0 0 0 * * ?")
     //@Scheduled(cron = "0 0/1 * * * *")
     public void file() {
         log.info(" corn delete file");
@@ -99,34 +109,44 @@ public class CronTab {
 //    }
 
 
-    public static void checkFileTime(File dir,int days) {
-        if(!dir.exists()){
+    /**
+     * 递归检查并删除目录下所有超期的文件，最后清理空目录
+     * @param dir  目标目录（会遍历其下所有子目录、子文件）
+     * @param days 文件保留天数，超过此天数的文件将被删除
+     */
+    public static void checkFileTime(File dir, int days) {
+        if (!dir.exists()) {
             return;
         }
         if (dir.isDirectory()) {
             String[] children = dir.list();
-            if(children.length == 0){
-                log.info("delete path:{}",dir.getPath());
-                dir.delete();
+            if (children != null) {
+                // 递归处理所有子文件和子目录
+                for (String child : children) {
+                    checkFileTime(new File(dir, child), days);
+                }
             }
-            for (int i = 0; i < children.length; i++) {
-                checkFileTime(new File(dir, children[i]),days);
+            // 处理完所有子项后，检查当前目录是否已空，若为空则删除
+            String[] remaining = dir.list();
+            if (remaining != null && remaining.length == 0) {
+                log.info("delete empty dir:{}", dir.getPath());
+                dir.delete();
             }
-        }else {
-            //判斷時間
+        } else {
+            // 判断文件创建时间，超过保留天数则删除
             BasicFileAttributes attr = null;
             try {
-                Path path =  dir.toPath();
+                Path path = dir.toPath();
                 attr = Files.readAttributes(path, BasicFileAttributes.class);
             } catch (IOException e) {
-                e.printStackTrace();
+                log.warn("read file attributes failed: {}", dir.getPath(), e);
+                return;
             }
-            // 创建时间
             Instant instant = attr.creationTime().toInstant();
             LocalDateTime createTime = LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
-            Duration duration = Duration.between(createTime,now);
-            if(days<=duration.toDays()){
-                log.info("delete path:{}",dir.getPath());
+            Duration duration = Duration.between(createTime, now);
+            if (days <= duration.toDays()) {
+                log.info("delete file:{}", dir.getPath());
                 dir.delete();
             }
         }