diff --git a/api.php b/api.php
index 7438050..d6d03dc 100644
--- a/api.php
+++ b/api.php
@@ -101,7 +101,7 @@ class FundMonitorAPI extends ApiBase {
             'to_emails' => []
         ];
         
-        file_put_contents($this->emailConfigFile, json_encode($defaultEmailConfig, JSON_PRETTY_PRINT));
+        FileManager::saveJsonFile($this->emailConfigFile, $defaultEmailConfig);
         $this->emailConfig = $defaultEmailConfig;
     }
 
@@ -119,7 +119,7 @@ class FundMonitorAPI extends ApiBase {
             'unique_ips' => []
         ];
         
-        file_put_contents($this->statsFile, json_encode($initialStats, JSON_PRETTY_PRINT));
+        FileManager::saveJsonFile($this->statsFile, $initialStats);
     }
 
     /**
@@ -159,7 +159,7 @@ class FundMonitorAPI extends ApiBase {
             ]
         ];
         
-        file_put_contents($this->configFile, json_encode($defaultConfig, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE));
+        FileManager::saveJsonFile($this->configFile, $defaultConfig);
     }
 
     /**
@@ -172,7 +172,7 @@ class FundMonitorAPI extends ApiBase {
             'today_data' => []
         ];
         
-        file_put_contents($this->historyFile, json_encode($initialHistory, JSON_PRETTY_PRINT));
+        FileManager::saveJsonFile($this->historyFile, $initialHistory);
     }
 
     /**
@@ -208,7 +208,7 @@ class FundMonitorAPI extends ApiBase {
             'sent_count' => 0,
             'failed_count' => 0
         ];
-        file_put_contents($this->emailStatusFile, json_encode($initialStatus, JSON_PRETTY_PRINT));
+        FileManager::saveJsonFile($this->emailStatusFile, $initialStatus);
     }
     
     /**
@@ -582,13 +582,10 @@ class FundMonitorAPI extends ApiBase {
      */
     private function getFundFromCache($fundCode) {
         $file = $this->getFundCachePath($fundCode);
-        if (!file_exists($file)) return false;
+        if (!FileManager::fileExists($file)) return false;
         // 过期判断
-        if (time() - filemtime($file) > $this->fundCacheTTL) return false;
-        $raw = @file_get_contents($file);
-        if ($raw === false) return false;
-        $data = json_decode($raw, true);
-        return is_array($data) ? $data : false;
+        if (time() - FileManager::getFileMTime($file) > $this->fundCacheTTL) return false;
+        return FileManager::loadJsonFile($file, false);
     }
 
     /**
@@ -597,7 +594,7 @@ class FundMonitorAPI extends ApiBase {
     private function cacheFundData($fundCode, $fundData) {
         // 保证目录存在
         FileManager::ensureDirExists($this->cacheDir);
-        @file_put_contents($this->getFundCachePath($fundCode), json_encode($fundData, JSON_UNESCAPED_UNICODE));
+        FileManager::saveJsonFile($this->getFundCachePath($fundCode), $fundData);
     }
 
     /**