python中Urllib模块应用实例
# -*-coding:utf-8-*-# urllib用于访问不需要验证的网络资源
# urllib.urlretrave(url，tempfile, functionLodingProcess,)提供了下载资源的功能。所需参数如其名，
# 不给定临时文件时，自动生成，返回文件名，和执行信息。
# get 和post 是http的两种常用的方法，get-->就象明信片方式[内容显式放在URL中、内容长度受限、不安全]
# post-->信封模式[内容放在信封里，内容长度不受某些限制，安全]
# 实例get方式：
import urllib
import os
def reporthook(blocks_read, block_size, total_size):
"""total_size is reported in bytes;
block_size is the amount read each time;
block_read is the number ofblocks successful read.
"""
if not blocks_read:
print 'connection opened'
return
if total_size < 0:# 没有给定总大小就输出已获得多少数据
print 'read %d blocks,(%d bytes)' % (blocks_read, blocks_read * block_size)
else:# 给定了total_size值输出获得比值
amount_read = block_size * blocks_read
print 'read %d blocks, or %d/%d' % (blocks_read, amount_read, total_size)
return
try:
filename, msg = urllib.urlretrieve('http://cve.scap.org.cn/CVE-2015-4785.html', reporthook=reporthook)
finally:
print 'File Exist?:', os.path.exists(filename), filename
txt = file(filename)
content = txt.read()
print content
urllib.urlcleanup()# 清理临时文件
print 'File Exist?:', os.path.exists(filename)
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