python爬虫分页获取图片并下载

--刚接触python2天，想高速上手，就写了个爬虫，写完之后，成就感暴增，用起来顺手多了。

1.源代码

#coding=utf-8

import urllib

import re

class Page():

	__slots__ = ('url', 'regex', 'arg' )

	def __init__(this ,url ,regex ,arg ):

		if not arg :

			arg['download'] = False

			arg['write'] = False

			arg['outpath'] = ''

		this.filter = Filter(url,{

			'regex' : regex,

			'custom' : arg['custom'] if arg.has_key('custom') else ''

		})

		this.url = url;

		this.outpath = arg['outpath'] if arg.has_key('outpath') else ''

		this.download =arg['download'] if arg.has_key('download') else False

		this.write = arg['write'] if arg.has_key('write') else False

		this.pagin = arg['pagin'] if arg.has_key('pagin') else False

	def start(this ,*prefix):

		_pagin = this.pagin; _getHtml = this.getHtml;_prefix = '1';

		if len(prefix) >= 1 : _prefix = prefix[0];

		_getHtml(this.url ,_prefix);

		if _pagin != False :

			_start = _pagin['start']; _end = _pagin['end']; _rule = _pagin['rule'];

			while _start <= _end :

				_getHtml(_rule.replace('{page}',str(_start)) ,str(_start));

				_start += 1

	def down(this ,url ,prefix):

		try:

			filename = str(prefix) + '_' + url[url.rfind("/")+1:]

			urllib.urlretrieve(url, this.outpath + filename);

			print 'download-succeed\t->',filename

		except:

			print 'download->failed'

	def downs(this ,arr ,prefix):

		for x in arr: this.down(x ,prefix);

	def writeFile(this ,arr):

		_file = open(this.outpath + 'list.txt', 'a+')

		try:

			_file.writelines('\n\n'+'\n'.join(arr))

		finally:

			_file.close()

	def getHtml(this ,url ,prefix):

		try:

			_p = urllib.urlopen(url); html = _p.read(); _p.close()

			html = unicode(html, "gb2312").encode("utf8")

			arr = this.filter.execute(html ,prefix)

			if this.download == True : this.downs(arr ,prefix);

			if this.write == True : this.writeFile(arr);

		except:

			print "catch finally exception." 

class Filter():

	def __init__(this ,url ,arg):

		this.arg = arg

		this.url = url

	def _getDomain(this):

		url = this.url.split('/')

		return url[0]+'//'+url[2]

	def _getRealUrl(this ,domain, url):

		if url[0] == '/' : return  domain + url;

		if 'http://' in url : return url

		#==============须要处理的字符串链接...

		return domain + '/' +url;

	def execute(this ,html ,prefix):

		_arg = this.arg; arr=[]; getRealUrl = this._getRealUrl;

		its = re.finditer( _arg['regex'] ,html)

		for match in its: arr.append(getRealUrl(this._getDomain() ,match.groups()[0]))

		if _arg.has_key('custom') == True and _arg['custom'] != '' : _arg['custom'](arr ,prefix);

		return arr

def paginList(arr ,prefix):

	num = 1;

	for x in arr:

		Page(x ,'<p><img\ssrc="(.*?)"\salt.*?</p>' ,{

			'download' : True,

			'outpath' : 'f:/temp/'

		}).start(prefix+'_'+str(num));

		num+=1

Page("http://www.netbian.com/fengjing/" ,'<li><a\shref="(.*?

)"\s.*?\salt="(.*?)"\s.*?</li>' ,{

	'custom' : paginList,

	'pagin' : {

		'start' : 2,

		'end' : 10,

		'rule' : 'http://www.netbian.com/fengjing/index_{page}.htm'

	}

}).start()

2.执行例如以下

$ python getjpg.py

download-succeed -> 1_1_1bdbc1d1628a1f0ebd5fc60055ee506e.jpg

download-succeed -> 1_2_01b5b45171979aace617ab79299d7515.jpg

download-succeed -> 1_3_5698c42371add40501a328ef2c753b4d.jpg

download-succeed -> 1_4_f7219087ce29c474a777867b8e4755ed.jpg

download-succeed -> 1_5_58bf8172ea8bbc4cee0a0f8240f2b289.jpg

download-succeed -> 1_6_b4700f4bd96f90039ed662ebbf6c1f7c.jpg

download-succeed -> 1_7_8a637b3362acddac4671d9ad02e4a93f.jpg

download-succeed -> 1_8_f28e22908b68d6fbe42a15c4fcd62613.jpg

download-succeed -> 1_9_03806c0b3d33cfc3a3eb4ea3bbe8ca9e.jpg

download-succeed -> 1_10_cf26fb246e9b57c06e328af94e60450b.jpg

download-succeed -> 1_11_7563610f39bd29b8381201b95eed2624.jpg

download-succeed -> 1_12_8ccaccede13d0f377d0d8822243f3b6a.jpg

download-succeed -> 1_13_c95a0207db67a334be4812cec25d7023.jpg

download-succeed -> 1_14_71ce070aef91660e8dad60a5919ec505.jpg

download-succeed -> 1_15_9a647a8f449cdb3208a561b4c9fe2ce6.jpg

download-succeed -> 1_16_45d9992e3d5080cf14ef73da14066283.jpg

download-succeed -> 1_17_7bd84ee7d6f5cb911a3b1dbc6e0775c4.jpg

download-succeed -> 1_18_8397b9d434a187444c389ebff48bcfb5.jpg

download-succeed -> 2_1_f14e658f2464769756039e1ff18d5693.jpg

download-succeed -> 2_2_ad051a669008969800ccd324de056465.jpg

download-succeed -> 2_3_6190ffe369199b95274100996b02359a.jpg

download-succeed -> 2_4_f14dce28d960941781a12a57123076df.jpg

download-succeed -> 2_5_c7fb3b6f700339e9f3c9ee02474211eb.jpg

download-succeed -> 2_6_327f1a33b8c5989a2d014ea41565caef.jpg

...

3.结果例如以下

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="">