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Python网页抓取urllib,urllib2,httplib[1]
分类: Python笔记2012-03-17 16:0278人阅读评论(0)收藏举报
前阶段使用到ftp,写了个工具脚本http://blog.iyunv.com/wklken/article/details/7059423
最近需要抓网页,看了下python抓取方式
需求:
抓取网页,解析获取内容
涉及库:【重点urllib2】
urllib http://docs.python.org/library/urllib.html
urllib2 http://docs.python.org/library/urllib2.html
httplib http://docs.python.org/library/httplib.html
使用urllib:
1. 抓取网页信息
urllib.urlopen(url[, data[, proxies]]) :
url: 表示远程数据的路径
data: 以post方式提交到url的数据
proxies:用于设置代理
urlopen返回对象提供方法:
- read() , readline() ,readlines() , fileno() , close() :这些方法的使用方式与文件对象完全一样
- info():返回一个httplib.HTTPMessage对象,表示远程服务器返回的头信息
- getcode():返回Http状态码。如果是http请求,200请求成功完成;404网址未找到
- geturl():返回请求的url
使用:
[python] view plaincopyprint?
- #!/usr/bin/python
- # -*- coding:utf-8 -*-
- # urllib_test.py
- # author:wklken
- # 2012-03-17 wklken#yeah.net
-
- import os
- import urllib
- url = "http://www.siteurl.com"
-
- def use_urllib():
- import urllib, httplib
- httplib.HTTPConnection.debuglevel = 1
- page = urllib.urlopen(url)
- print"status:", page.getcode() #200请求成功,404
- print"url:", page.geturl()
- print"head_info:\n", page.info()
- print"Content len:", len(page.read())
#!/usr/bin/python# -*- coding:utf-8 -*-# urllib_test.py# author:wklken# 2012-03-17 wklken#yeah.net import osimport urlliburl = "http://www.siteurl.com"def use_urllib():import urllib, httplibhttplib.HTTPConnection.debuglevel = 1 page = urllib.urlopen(url)print "status:", page.getcode() #200请求成功,404print "url:", page.geturl()print "head_info:\n", page.info()print "Content len:", len(page.read())
附带的其他方法:(主要是url编码解码)
- urllib.quote(string[, safe]):对字符串进行编码。参数safe指定了不需要编码的字符
- urllib.unquote(string) :对字符串进行解码
- urllib.quote_plus(string [ , safe ] ) :与urllib.quote类似,但这个方法用'+'来替换' ',而quote用'%20'来代替' '
- urllib.unquote_plus(string ) :对字符串进行解码
- urllib.urlencode(query[, doseq]):将dict或者包含两个元素的元组列表转换成url参数。例如 字典{'name': 'wklken', 'pwd': '123'}将被转换为"name=wklken&pwd=123"
- urllib.pathname2url(path):将本地路径转换成url路径
- urllib.url2pathname(path):将url路径转换成本地路径
使用:
[python] view plaincopyprint?
- def urllib_other_functions():
- astr = urllib.quote('this is "K"')
- print astr
- print urllib.unquote(astr)
- bstr = urllib.quote_plus('this is "K"')
- print bstr
- print urllib.unquote(bstr)
-
- params = {"a":"1", "b":"2"}
- print urllib.urlencode(params)
-
- l2u = urllib.pathname2url(r'd:\a\test.py')
- print l2u
- print urllib.url2pathname(l2u)
def urllib_other_functions():astr = urllib.quote('this is "K"')print astrprint urllib.unquote(astr)bstr = urllib.quote_plus('this is "K"')print bstrprint urllib.unquote(bstr)params = {"a":"1", "b":"2"}print urllib.urlencode(params)l2u = urllib.pathname2url(r'd:\a\test.py')print l2u print urllib.url2pathname(l2u)
2. 下载远程数据
urlretrieve方法直接将远程数据下载到本地
urllib.urlretrieve(url[, filename[, reporthook[, data]]]):
filename指定保存到本地的路径(若未指定该,urllib生成一个临时文件保存数据)
reporthook回调函数,当连接上服务器、以及相应的数据块传输完毕的时候会触发该回调
data指post到服务器的数据
该方法返回一个包含两个元素的元组(filename, headers),filename表示保存到本地的路径,header表示服务器的响应头。
[python] view plaincopyprint?
- def callback_f(downloaded_size, block_size, romote_total_size):
- per = 100.0 * downloaded_size * block_size / romote_total_size
- if per > 100:
- per = 100
- print"%.2f%%"% per
-
- def use_urllib_retrieve():
- import urllib
- local = os.path.join(os.path.abspath("./"), "a.html")
- print local
- urllib.urlretrieve(url,local,callback_f)
def callback_f(downloaded_size, block_size, romote_total_size):per = 100.0 * downloaded_size * block_size / romote_total_sizeif per > 100:per = 100 print "%.2f%%"% per def use_urllib_retrieve():import urlliblocal = os.path.join(os.path.abspath("./"), "a.html")print localurllib.urlretrieve(url,local,callback_f)
下一篇:httplib
转载请注明出处:http://blog.iyunv.com/wklken
Python网页抓取urllib,urllib2,httplib[2]
分类: Python笔记2012-03-17 16:0986人阅读评论(0)收藏举报
上一篇使用urllib抓取 Python网页抓取urllib,urllib2,httplib[1]
使用httplib抓取:
表示一次与服务器之间的交互,即请求/响应
httplib.HTTPConnection ( host [ , port [ ,strict [ , timeout ]]] )
host表示服务器主机
port为端口号,默认值为80
strict的 默认值为false, 表示在无法解析服务器返回的状态行时(status line) (比较典型的状态行如: HTTP/1.0 200 OK ),是否抛BadStatusLine 异常
可选参数timeout 表示超时时间。
HTTPConnection提供的方法:
- HTTPConnection.request ( method , url [ ,body [ , headers ]] )
调用request 方法会向服务器发送一次请求
method 表示请求的方法,常用有方法有get 和post ;
url 表示请求的资源的url ;
body 表示提交到服务器的数据,必须是字符串(如果method是”post”,则可以把body 理解为html 表单中的数据);
headers 表示请求的http 头。
- HTTPConnection.getresponse ()
获取Http 响应。返回的对象是HTTPResponse 的实例,关于HTTPResponse 在下面会讲解。
- HTTPConnection.connect ()
连接到Http 服务器。
- HTTPConnection.close ()
关闭与服务器的连接。
- HTTPConnection.set_debuglevel ( level )
设置高度的级别。参数level 的默认值为0 ,表示不输出任何调试信息。
httplib.HTTPResponse
-HTTPResponse表示服务器对客户端请求的响应。往往通过调用HTTPConnection.getresponse()来创建,它有如下方法和属性:
-HTTPResponse.read([amt])
获取响应的消息体。如果请求的是一个普通的网页,那么该方法返回的是页面的html。可选参数amt表示从响应流中读取指定字节的数据。
-HTTPResponse.getheader(name[, default])
获取响应头。Name表示头域(header field)名,可选参数default在头域名不存在的情况下作为默认值返回。
-HTTPResponse.getheaders()
以列表的形式返回所有的头信息。
- HTTPResponse.msg
获取所有的响应头信息。
-HTTPResponse.version
获取服务器所使用的http协议版本。11表示http/1.1;10表示http/1.0。
-HTTPResponse.status
获取响应的状态码。如:200表示请求成功。
-HTTPResponse.reason
返回服务器处理请求的结果说明。一般为”OK”
使用例子:
[python] view plaincopyprint?
- #!/usr/bin/python
- # -*- coding:utf-8 -*-
- # httplib_test.py
- # author:wklken
- # 2012-03-17 wklken#yeah.net
- def use_httplib():
- import httplib
- conn = httplib.HTTPConnection("www.baidu.com")
- i_headers = {"User-Agent": "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1) Gecko/20090624 Firefox/3.5",
- "Accept": "text/plain"}
- conn.request("GET", "/", headers = i_headers)
- r1 = conn.getresponse()
- print"version:", r1.version
- print"reason:", r1.reason
- print"status:", r1.status
- print"msg:", r1.msg
- print"headers:", r1.getheaders()
- data = r1.read()
- print len(data)
- conn.close()
-
- if __name__ == "__main__":
- use_httplib()
Python网页抓取urllib,urllib2,httplib[3]
分类: Python笔记2012-03-17 16:2180人阅读评论(0)收藏举报
使用urllib2,太强大了
试了下用代理登陆拉取cookie,跳转抓图片......
文档:http://docs.python.org/library/urllib2.html
直接上demo代码了
包括:直接拉取,使用Reuqest(post/get),使用代理,cookie,跳转处理
[python] view plaincopyprint?
- #!/usr/bin/python
- # -*- coding:utf-8 -*-
- # urllib2_test.py
- # author: wklken
- # 2012-03-17 wklken@yeah.net
-
-
- import urllib,urllib2,cookielib,socket
-
- url = "http://www.testurl....."#change yourself
- #最简单方式
- def use_urllib2():
- try:
- f = urllib2.urlopen(url, timeout=5).read()
- except urllib2.URLError, e:
- print e.reason
- print len(f)
-
- #使用Request
- def get_request():
- #可以设置超时
- socket.setdefaulttimeout(5)
- #可以加入参数 [无参数,使用get,以下这种方式,使用post]
- params = {"wd":"a","b":"2"}
- #可以加入请求头信息,以便识别
- i_headers = {"User-Agent": "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1) Gecko/20090624 Firefox/3.5",
- "Accept": "text/plain"}
- #use post,have some params post to server,if not support ,will throw exception
- #req = urllib2.Request(url, data=urllib.urlencode(params), headers=i_headers)
- req = urllib2.Request(url, headers=i_headers)
-
- #创建request后,还可以进行其他添加,若是key重复,后者生效
- #request.add_header('Accept','application/json')
- #可以指定提交方式
- #request.get_method = lambda: 'PUT'
- try:
- page = urllib2.urlopen(req)
- print len(page.read())
- #like get
- #url_params = urllib.urlencode({"a":"1", "b":"2"})
- #final_url = url + "?" + url_params
- #print final_url
- #data = urllib2.urlopen(final_url).read()
- #print "Method:get ", len(data)
- except urllib2.HTTPError, e:
- print"Error Code:", e.code
- except urllib2.URLError, e:
- print"Error Reason:", e.reason
-
- def use_proxy():
- enable_proxy = False
- proxy_handler = urllib2.ProxyHandler({"http":"http://proxyurlXXXX.com:8080"})
- null_proxy_handler = urllib2.ProxyHandler({})
- if enable_proxy:
- opener = urllib2.build_opener(proxy_handler, urllib2.HTTPHandler)
- else:
- opener = urllib2.build_opener(null_proxy_handler, urllib2.HTTPHandler)
- #此句设置urllib2的全局opener
- urllib2.install_opener(opener)
- content = urllib2.urlopen(url).read()
- print"proxy len:",len(content)
-
- class NoExceptionCookieProcesser(urllib2.HTTPCookieProcessor):
- def http_error_403(self, req, fp, code, msg, hdrs):
- return fp
- def http_error_400(self, req, fp, code, msg, hdrs):
- return fp
- def http_error_500(self, req, fp, code, msg, hdrs):
- return fp
-
- def hand_cookie():
- cookie = cookielib.CookieJar()
- #cookie_handler = urllib2.HTTPCookieProcessor(cookie)
- #after add error exception handler
- cookie_handler = NoExceptionCookieProcesser(cookie)
- opener = urllib2.build_opener(cookie_handler, urllib2.HTTPHandler)
- url_login = "https://www.yourwebsite/?login"
- params = {"username":"user","password":"111111"}
- opener.open(url_login, urllib.urlencode(params))
- for item in cookie:
- print item.name,item.value
- #urllib2.install_opener(opener)
- #content = urllib2.urlopen(url).read()
- #print len(content)
- #得到重定向 N 次以后最后页面URL
- def get_request_direct():
- import httplib
- httplib.HTTPConnection.debuglevel = 1
- request = urllib2.Request("http://www.google.com")
- request.add_header("Accept", "text/html,*/*")
- request.add_header("Connection", "Keep-Alive")
- opener = urllib2.build_opener()
- f = opener.open(request)
- print f.url
- print f.headers.dict
- print len(f.read())
-
- if __name__ == "__main__":
- use_urllib2()
- get_request()
- get_request_direct()
- use_proxy()
- hand_cookie()
#!/usr/bin/python# -*- coding:utf-8 -*-# urllib2_test.py# author: wklken# 2012-03-17 wklken@yeah.netimport urllib,urllib2,cookielib,socketurl = "http://www.testurl....." #change yourself#最简单方式def use_urllib2():try:f = urllib2.urlopen(url, timeout=5).read()except urllib2.URLError, e:print e.reasonprint len(f)#使用Requestdef get_request():#可以设置超时socket.setdefaulttimeout(5)#可以加入参数 [无参数,使用get,以下这种方式,使用post]params = {"wd":"a","b":"2"}#可以加入请求头信息,以便识别i_headers = {"User-Agent": "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.1) Gecko/20090624 Firefox/3.5","Accept": "text/plain"}#use post,have some params post to server,if not support ,will throw exception#req = urllib2.Request(url, data=urllib.urlencode(params), headers=i_headers)req = urllib2.Request(url, headers=i_headers)#创建request后,还可以进行其他添加,若是key重复,后者生效#request.add_header('Accept','application/json')#可以指定提交方式#request.get_method = lambda: 'PUT'try:page = urllib2.urlopen(req)print len(page.read())#like get#url_params = urllib.urlencode({"a":"1", "b":"2"})#final_url = url + "?" + url_params#print final_url#data = urllib2.urlopen(final_url).read()#print "Method:get ", len(data)except urllib2.HTTPError, e:print "Error Code:", e.codeexcept urllib2.URLError, e:print "Error Reason:", e.reasondef use_proxy():enable_proxy = Falseproxy_handler = urllib2.ProxyHandler({"http":"http://proxyurlXXXX.com:8080"})null_proxy_handler = urllib2.ProxyHandler({})if enable_proxy:opener = urllib2.build_opener(proxy_handler, urllib2.HTTPHandler)else:opener = urllib2.build_opener(null_proxy_handler, urllib2.HTTPHandler)#此句设置urllib2的全局openerurllib2.install_opener(opener)content = urllib2.urlopen(url).read()print "proxy len:",len(content)class NoExceptionCookieProcesser(urllib2.HTTPCookieProcessor):def http_error_403(self, req, fp, code, msg, hdrs):return fpdef http_error_400(self, req, fp, code, msg, hdrs):return fpdef http_error_500(self, req, fp, code, msg, hdrs):return fpdef hand_cookie():cookie = cookielib.CookieJar()#cookie_handler = urllib2.HTTPCookieProcessor(cookie)#after add error exception handlercookie_handler = NoExceptionCookieProcesser(cookie)opener = urllib2.build_opener(cookie_handler, urllib2.HTTPHandler)url_login = "https://www.yourwebsite/?login"params = {"username":"user","password":"111111"}opener.open(url_login, urllib.urlencode(params))for item in cookie:print item.name,item.value#urllib2.install_opener(opener)#content = urllib2.urlopen(url).read()#print len(content)#得到重定向 N 次以后最后页面URLdef get_request_direct():import httplibhttplib.HTTPConnection.debuglevel = 1request = urllib2.Request("http://www.google.com")request.add_header("Accept", "text/html,*/*")request.add_header("Connection", "Keep-Alive")opener = urllib2.build_opener()f = opener.open(request)print f.urlprint f.headers.dictprint len(f.read())if __name__ == "__main__":use_urllib2()get_request()get_request_direct()use_proxy()hand_cookie()
Python urllib2递归抓取某个网站下图片
分类: Python笔记2012-03-17 19:5192人阅读评论(0)收藏举报
需求:
抓取某个网站下图片
可定义 图片保存路径,最小图片大小域值,遍历深度,是否遍历到外站,抓取并下载图片
使用库:
urllib http://docs.python.org/library/urllib.html【下载】
urllib2 http://docs.python.org/library/urllib2.html【抓取】
urlparse http://docs.python.org/library/urlparse.html【url切分用到】
sgmllib http://docs.python.org/library/sgmllib.html【html解析用到】
代码:
[python] view plaincopyprint?
- #!/usr/bin/python
- # -*- coding:utf-8 -*-
- # author: wklken
- # 2012-03-17 wklken@yeah.net
- #1实现url解析 #2实现图片下载 #3优化重构
- #4多线程 尚未加入
-
- import os,sys,urllib,urllib2,urlparse
- from sgmllib import SGMLParser
-
- img = []
- class URLLister(SGMLParser):
- def reset(self):
- SGMLParser.reset(self)
- self.urls=[]
- self.imgs=[]
- def start_a(self, attrs):
- href = [ v for k,v in attrs if k=="href"and v.startswith("http")]
- if href:
- self.urls.extend(href)
- def start_img(self, attrs):
- src = [ v for k,v in attrs if k=="src"and v.startswith("http") ]
- if src:
- self.imgs.extend(src)
-
-
- def get_url_of_page(url, if_img = False):
- urls = []
- try:
- f = urllib2.urlopen(url, timeout=1).read()
- url_listen = URLLister()
- url_listen.feed(f)
- if if_img:
- urls.extend(url_listen.imgs)
- else:
- urls.extend(url_listen.urls)
- except urllib2.URLError, e:
- print e.reason
- return urls
-
- #递归处理页面
- def get_page_html(begin_url, depth, ignore_outer, main_site_domain):
- #若是设置排除外站 过滤之
- if ignore_outer:
- ifnot main_site_domain in begin_url:
- return
-
- if depth == 1:
- urls = get_url_of_page(begin_url, True)
- img.extend(urls)
- else:
- urls = get_url_of_page(begin_url)
- if urls:
- for url in urls:
- get_page_html(url, depth-1)
-
- #下载图片
- def download_img(save_path, min_size):
- print"download begin..."
- for im in img:
- filename = im.split("/")[-1]
- dist = os.path.join(save_path, filename)
- #此方式判断图片的大小太浪费了
- #if len(urllib2.urlopen(im).read()) < min_size:
- # continue
- #这种方式先拉头部,应该好多了,不用再下载一次
- connection = urllib2.build_opener().open(urllib2.Request(im))
- if int(connection.headers.dict['content-length']) < min_size:
- continue
- urllib.urlretrieve(im, dist,None)
- print"Done: ", filename
- print"download end..."
-
- if __name__ == "__main__":
- #抓取图片首个页面
- url = "http://www.baidu.com/"
- #图片保存路径
- save_path = os.path.abspath("./downlaod")
- ifnot os.path.exists(save_path):
- os.mkdir(save_path)
- #限制图片最小必须大于此域值 单位 B
- min_size = 92
- #遍历深度
- max_depth = 1
- #是否只遍历目标站内,即存在外站是否忽略
- ignore_outer = True
- main_site_domain = urlparse.urlsplit(url).netloc
-
- get_page_html(url, max_depth, ignore_outer, main_site_domain)
-
- download_img(save_path, min_size)
#!/usr/bin/python# -*- coding:utf-8 -*-# author: wklken# 2012-03-17 wklken@yeah.net#1实现url解析 #2实现图片下载 #3优化重构#4多线程 尚未加入import os,sys,urllib,urllib2,urlparsefrom sgmllib import SGMLParser img = []class URLLister(SGMLParser):def reset(self):SGMLParser.reset(self)self.urls=[]self.imgs=[]def start_a(self, attrs):href = [ v for k,v in attrs if k=="href" and v.startswith("http")]if href:self.urls.extend(href)def start_img(self, attrs):src = [ v for k,v in attrs if k=="src" and v.startswith("http") ]if src:self.imgs.extend(src)def get_url_of_page(url, if_img = False):urls = []try:f = urllib2.urlopen(url, timeout=1).read()url_listen = URLLister()url_listen.feed(f)if if_img:urls.extend(url_listen.imgs)else:urls.extend(url_listen.urls)except urllib2.URLError, e:print e.reasonreturn urls#递归处理页面def get_page_html(begin_url, depth, ignore_outer, main_site_domain):#若是设置排除外站 过滤之if ignore_outer:if not main_site_domain in begin_url:returnif depth == 1:urls = get_url_of_page(begin_url, True)img.extend(urls)else:urls = get_url_of_page(begin_url)if urls:for url in urls:get_page_html(url, depth-1)#下载图片def download_img(save_path, min_size):print "download begin..."for im in img:filename = im.split("/")[-1]dist = os.path.join(save_path, filename)#此方式判断图片的大小太浪费了#if len(urllib2.urlopen(im).read()) < min_size:# continue#这种方式先拉头部,应该好多了,不用再下载一次connection = urllib2.build_opener().open(urllib2.Request(im))if int(connection.headers.dict['content-length']) < min_size:continueurllib.urlretrieve(im, dist,None)print "Done: ", filenameprint "download end..."if __name__ == "__main__":#抓取图片首个页面url = "http://www.baidu.com/"#图片保存路径save_path = os.path.abspath("./downlaod")if not os.path.exists(save_path):os.mkdir(save_path)#限制图片最小必须大于此域值 单位 Bmin_size = 92#遍历深度max_depth = 1#是否只遍历目标站内,即存在外站是否忽略ignore_outer = Truemain_site_domain = urlparse.urlsplit(url).netlocget_page_html(url, max_depth, ignore_outer, main_site_domain)download_img(save_path, min_size)
后续可以优化
1.使用多线程优化下载,目前多层遍历不够速度
2.使用BeautifulSoup写一个版本
3.加入图形界面......
2012-03-17
wklken
转载请注明出处:http://blog.iyunv.com/wklken |
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