我正在创建一个程序，将下载一个。jar (java)文件从一个web服务器，通过读取URL指定在同一游戏/应用程序的。jad文件。我使用的是Python 3.2.1
我已经设法从JAD文件中提取JAR文件的URL(每个JAD文件都包含到JAR文件的URL)，但是正如您想象的那样，提取的值是type()字符串。
这是相关的函数:
def downloadFile(URL=None):
import httplib2
h = httplib2.Http(".cache")
resp, content = h.request(URL, "GET")
return content
downloadFile(URL_from_file)
然而，我总是得到一个错误，说在上面的函数的类型必须是字节，而不是字符串。我尝试使用URL.encode('utf-8')，也字节(URL,encoding='utf-8')，但我总是得到相同或类似的错误。
所以基本上我的问题是如何从服务器下载文件时，URL存储在字符串类型?
当前回答
是的，当然requests是一个很好的包，用于与HTTP请求相关的东西。但是我们需要注意输入数据的编码类型，下面是一个解释差异的示例
from requests import get
# case when the response is byte array
url = 'some_image_url'
response = get(url)
with open('output', 'wb') as file:
file.write(response.content)
# case when the response is text
# Here unlikely if the reponse content is of type **iso-8859-1** we will have to override the response encoding
url = 'some_page_url'
response = get(url)
# override encoding by real educated guess as provided by chardet
r.encoding = r.apparent_encoding
with open('output', 'w', encoding='utf-8') as file:
file.write(response.content)
其他回答
如果你正在使用Linux，你可以通过python shell使用Linux的wget模块。下面是一个示例代码片段
import os
url = 'http://www.example.com/foo.zip'
os.system('wget %s'%url)
是的，当然requests是一个很好的包，用于与HTTP请求相关的东西。但是我们需要注意输入数据的编码类型，下面是一个解释差异的示例
from requests import get
# case when the response is byte array
url = 'some_image_url'
response = get(url)
with open('output', 'wb') as file:
file.write(response.content)
# case when the response is text
# Here unlikely if the reponse content is of type **iso-8859-1** we will have to override the response encoding
url = 'some_page_url'
response = get(url)
# override encoding by real educated guess as provided by chardet
r.encoding = r.apparent_encoding
with open('output', 'w', encoding='utf-8') as file:
file.write(response.content)
我希望我正确理解了这个问题，即:当URL存储为字符串类型时，如何从服务器下载文件?
我下载文件并保存在本地使用下面的代码:
import requests
url = 'https://www.python.org/static/img/python-logo.png'
fileName = 'D:\Python\dwnldPythonLogo.png'
req = requests.get(url)
file = open(fileName, 'wb')
for chunk in req.iter_content(100000):
file.write(chunk)
file.close()
这里我们可以在Python3中使用urllib的Legacy接口:
下面的函数和类是从Python 2模块urllib(而不是urllib2)移植过来的。它们在将来的某个时候可能会被弃用。
示例(2行代码):
import urllib.request
url = 'https://www.python.org/static/img/python-logo.png'
urllib.request.urlretrieve(url, "logo.png")
from urllib import request
def get(url):
with request.urlopen(url) as r:
return r.read()
def download(url, file=None):
if not file:
file = url.split('/')[-1]
with open(file, 'wb') as f:
f.write(get(url))
