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Python的ftplib库本身并不支持断点续传
首先,确保已经安装了ftplib和hashlib库。如果没有安装,可以使用以下命令安装:
pip install ftplib
然后,使用以下代码实现断点续传:
import os
import hashlib
from ftplib import FTP
def md5(file_path):
hasher = hashlib.md5()
with open(file_path, 'rb') as f:
buf = f.read(65536)
while buf:
hasher.update(buf)
buf = f.read(65536)
return hasher.hexdigest()
def resume_download(ftp, remote_file_path, local_file_path):
if not os.path.exists(local_file_path):
with open(local_file_path, 'wb') as f:
ftp.retrbinary('RETR ' + remote_file_path, f.write)
else:
local_md5 = md5(local_file_path)
with open(local_file_path, 'rb') as f:
ftp.sendcmd('TYPE I')
remote_md5 = ftp.sendcmd('MD5 ' + remote_file_path)
remote_md5 = remote_md5.split()[1]
if local_md5 == remote_md5:
print("File already fully downloaded.")
else:
with open(local_file_path, 'ab') as f:
ftp.retrbinary('RETR ' + remote_file_path, f.write, rest=os.path.getsize(local_file_path))
print("Download resumed from the last successfully downloaded byte.")
def main():
ftp = FTP('ftp.example.com')
ftp.login(user='username', passwd='password')
remote_file_path = '/path/to/remote/file'
local_file_path = '/path/to/local/file'
resume_download(ftp, remote_file_path, local_file_path)
ftp.quit()
if __name__ == '__main__':
main()
请将ftp.example.com、username、password、/path/to/remote/file和/path/to/local/file替换为实际的FTP服务器地址、用户名、密码、远程文件路径和本地文件路径。这个脚本将尝试从上次成功下载的字节处继续下载文件。如果文件已经完全下载,它将输出相应的消息。
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