python pycurl模块网络编程简单例子

#!/usr/bin/env python2
#encoding=utf8

import pycurl
import StringIO

# 安装pycurl到http://pycurl.sourceforge.net/这里去找.
# 在windows安装http://pycurl.sourceforge.net/download/, 视python版本决定文件下载，windows使用python2.4，需要下载 pycurl-ssl-7.15.5.1.win32-py2.4.exe 。

def test(debug_type, debug_msg):
print "debug(%d): %s" % (debug_type, debug_msg)

def postFile(url,post_file):
#print pycurl.version_info()

#这个函数创建一个同 libcurl中的CURL处理器相对应的Curl对象.Curl对象自动的设置CURLOPT_VERBOSE为0, CURLOPT_NOPROGRESS为1,提供一个默认的CURLOPT_USERAGENT和设置CURLOPT_ERRORBUFFER指向一个私有的错误缓冲区.
c = pycurl.Curl() #创建一个同libcurl中的CURL处理器相对应的Curl对象

b = StringIO.StringIO()

#c.setopt(c.POST, 1)

c.setopt(pycurl.URL, url) #设置要访问的网址 url = "http://www.jb200.com"

#写的回调
c.setopt(pycurl.WRITEFUNCTION, b.write)
c.setopt(pycurl.FOLLOWLOCATION, 1) #参数有1、2

#最大重定向次数,可以预防重定向陷阱
c.setopt(pycurl.MAXREDIRS, 5)

#连接超时设置
c.setopt(pycurl.CONNECTTIMEOUT, 60) #链接超时
# c.setopt(pycurl.TIMEOUT, 300) #下载超时

# c.setopt(pycurl.HEADER, True)
# c.setopt(c.HTTPHEADER, ["Content-Type: application/x-www-form-urlencoded","X-Requested-With:XMLHttpRequest","Cookie:"+set_cookie[0]])

#模拟浏览器
c.setopt(pycurl.USERAGENT, "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)")
# c.setopt(pycurl.AUTOREFERER,1)
# c.setopt(c.REFERER, url)

# cookie设置
# Option -b/--cookie <name=string/file> Cookie string or file to read cookies from
# Note: must be a string, not a file object.
# c.setopt(pycurl.COOKIEFILE, "cookie_file_name")

# Option -c/--cookie-jar Write cookies to this file after operation
# Note: must be a string, not a file object.
# c.setopt(pycurl.COOKIEJAR, "cookie_file_name")

# Option -d/--data HTTP POST data
post_data_dic = {"name":"value"}
c.setopt(c.POSTFIELDS, urllib.urlencode(post_data_dic))

#设置代理
# c.setopt(pycurl.PROXY, ‘http://11.11.11.11:8080′)
# c.setopt(pycurl.PROXYUSERPWD, ‘aaa:aaa’)
#不明确作用
# c.setopt(pycurl.HTTPPROXYTUNNEL,1) #隧道代理
# c.setopt(pycurl.NOSIGNAL, 1)

#设置post请求，上传文件的字段名 上传的文件
#post_file = "/home/ubuntu/avatar.jpg"
c.setopt(c.HTTPPOST, [("textname", (c.FORM_FILE, post_file))])

# 调试回调.调试信息类型是一个调试信 息的整数标示类型.在这个回调被调用时VERBOSE选项必须可用
# c.setopt(c.VERBOSE, 1) #verbose 详细
# c.setopt(c.DEBUGFUNCTION, test)

# f = open("body", "wb")
# c.setopt(c.WRITEDATA, f)
# h = open("header", "wb")
# c.setopt(c.WRITEHEADER, h)
# print "Header is in file 'header', body is in file 'body'"
# f.close()
# h.close()

# c.setopt(c.NOPROGRESS, 0)
# c.setopt(c.PROGRESSFUNCTION, progress)

# c.setopt(c.OPT_FILETIME, 1)

#访问,阻塞到访问结束
c.perform() #执行上述访问网址的操作

print "HTTP-code:", c.getinfo(c.HTTP_CODE) #打印出 200(HTTP状态码)
print "Total-time:", c.getinfo(c.TOTAL_TIME)
print "Download speed: %.2f bytes/second" % c.getinfo(c.SPEED_DOWNLOAD)
print "Document size: %d bytes" % c.getinfo(c.SIZE_DOWNLOAD)
print "Effective URL:", c.getinfo(c.EFFECTIVE_URL)
print "Content-type:", c.getinfo(c.CONTENT_TYPE)
print "Namelookup-time:", c.getinfo(c.NAMELOOKUP_TIME)
print "Redirect-time:", c.getinfo(c.REDIRECT_TIME)
print "Redirect-count:", c.getinfo(c.REDIRECT_COUNT)

# epoch = c.getinfo(c.INFO_FILETIME)
#print "Filetime: %d (%s)" % (epoch, time.ctime(epoch))

html = b.getvalue()
print(html)

b.close()
c.close()

## Callback function invoked when body data is ready
def body(buf):
# Print body data to stdout
import sys
sys.stdout.write(buf)
# Returning None implies that all bytes were written

## Callback function invoked when header data is ready
def header(buf):
# Print header data to stderr
import sys
sys.stderr.write(buf)
# Returning None implies that all bytes were written

c = pycurl.Curl()
c.setopt(pycurl.URL, “http://www.python.org/”)
c.setopt(pycurl.WRITEFUNCTION, body)
c.setopt(pycurl.HEADERFUNCTION, header)
c.perform()