update

utils/ftp.py

 import ftplib
+import os
 
 
 class FTPUtil:
@@ -20,12 +21,37 @@ class FTPUtil:
     def get_connection(self):
         return self.ftp
 
-    def download(self, remote_path, local_path):
-        """
-        remote_path means the remote file name
-        and local_path is the local file name.
-        """
-        with open(local_path, 'wb') as fp:
-            self.ftp.retrbinary('RETR ' + remote_path, fp.write)
+    def download(self, remote_file, local_file):
+        try:
+            # 检查本地文件是否已经存在，如果存在则获取其大小
+            local_file_size = 0
+            if os.path.exists(local_file):
+                local_file_size = os.path.getsize(local_file)
+
+            # 设置从指定位置开始下载
+            self.ftp.voidcmd('TYPE I')
+            remote_file_size = self.ftp.size(remote_file)
+            if local_file_size < remote_file_size:
+                self.ftp.sendcmd('REST {}'.format(local_file_size))
+
+            # 以追加模式打开本地文件
+            with open(local_file, 'ab') as file:
+                def callback(data):
+                    file.write(data)
+
+                # 开始下载文件
+                self.ftp.retrbinary('RETR {}'.format(remote_file), callback)
+
+            print(f'{local_file} 文件下载完成')
+        except Exception as e:
+            print(f'下载 {local_file} 过程中出现错误: {e}')
+
+    # def download(self, remote_path, local_path):
+    #     """
+    #     remote_path means the remote file name
+    #     and local_path is the local file name.
+    #     """
+    #     with open(local_path, 'wb') as fp:
+    #         self.ftp.retrbinary('RETR ' + remote_path, fp.write)