本文介绍了几种常用的python下载文件的方法,具体使用到了htttplib2,urllib等包,希望对大家有帮忙。
1.简单文件下载
使用htttplib2,具体代码如下:
h = httplib2.Http()
url = 'http://www.lsjlt.com/ip.zip'
resp, content = h.request(url)
if resp['status'] == '200':
with open(filename, 'wb') as f:
f.write(content)
使用urllib,具体代码如下:
filename = urllib.unquote(url).decode('utf8').split('/')[-1]
urllib.urlretrieve(url, filename)
2.较大文件下载
def down_file():
url = "http://www.lsjlt.com/download.abc"
file_name = url.split('/')[-1]
u = urllib2.urlopen(url)
f = open(file_name, 'wb')
meta = u.info()
file_size = int(meta.getheaders("Content-Length")[0])
file_size_dl = 0
block_sz = 8192
while True:
buffer = u.read(block_sz)
if not buffer:
break
file_size_dl += len(buffer)
f.write(buffer)
f.close()
在获取下载文件名的过程中,可以解析url,代码如下:
scheme, netloc, path, query, fragment = urlparse.urlsplit(url)
filename = os.path.basename(path)
if not filename:
filename = 'downloaded.file'
3.端点续传下载
在使用HTTP协议进行下载的时候只需要在头上设置一下Range的范围就可以进行断点续传下载,当然,首先服务器需要支持断点续传。
利用Python的urllib2模块完成断点续传下载的例子:
#!/usr/bin/python
# -*- coding: UTF-8 -*
'''
Created on 2013-04-15
Created by RobinTang
A demo for Resuming Transfer
'''
import urllib2
req = urllib2.Request('http://www.python.org/')
req.add_header('Range', 'bytes=0-20') # set the range, from 0byte to 19byte, 20bytes len
res = urllib2.urlopen(req)
data = res.read()
print data
print '---------'
print 'len:%d'%len(data)