jb51上面的资源还比较全,就准备用python来实现自动采集信息,与下载啦。
Python具有丰富和强大的库,使用urllib,re等就可以轻松开发出一个网络信息采集器!
下面,是我写的一个实例脚本,用来采集某技术网站的特定栏目的所有电子书资源,并下载到本地保存!
软件运行截图如下:
在脚本运行时期,不但会打印出信息到shell窗口,还会保存日志到txt文件,记录采集到的页面地址,书籍的名称,大小,服务器本地下载地址以及百度网盘的下载地址!
实例采集并下载服务器之家的python栏目电子书资源:
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# -*- coding:utf-8 -*- import re import urllib2 import urllib import sys import os reload (sys) sys.setdefaultencoding( 'utf-8' ) def getHtml(url): request = urllib2.Request(url) page = urllib2.urlopen(request) htmlcontent = page.read() #解决中文乱码问题 htmlcontent = htmlcontent.decode( 'gbk' , 'ignore' ).encode( "utf8" , 'ignore' ) return htmlcontent def report(count, blockSize, totalSize): percent = int (count * blockSize * 100 / totalSize) sys.stdout.write( "r%d%%" % percent + ' complete' ) sys.stdout.flush() def getBookInfo(url): htmlcontent = getHtml(url); #print "htmlcontent=",htmlcontent; # you should see the ouput html #<h1 class="h1user">crifan</h1> regex_title = '<h1s+?itemprop="name">(?P<title>.+?)</h1>' ; title = re.search(regex_title, htmlcontent); if (title): title = title.group( "title" ); print "书籍名字:" ,title; file_object.write( '书籍名字:' + title + 'r' ); #<li>书籍大小:<span itemprop="fileSize">27.2MB</span></li> filesize = re.search( '<spans+?itemprop="fileSize">(?P<filesize>.+?)</span>' , htmlcontent); if (filesize): filesize = filesize.group( "filesize" ); print "文件大小:" ,filesize; file_object.write( '文件大小:' + filesize + 'r' ); #<div class="picthumb"><a href="//img.jbzj.com/do/uploads/litimg/151210/1A9262GO2.jpg" target="_blank" bookimg = re.search( '<divs+?class="picthumb"><a href="(?P<bookimg>.+?)" rel="external nofollow" target="_blank"' , htmlcontent); if (bookimg): bookimg = bookimg.group( "bookimg" ); print "封面图片:" ,bookimg; file_object.write( '封面图片:' + bookimg + 'r' ); #<li><a href="http://xz6.jb51.net:81/201512/books/JavaWeb100(jb51.net).rar" target="_blank">酷云中国电信下载</a></li> downurl1 = re.search( '<li><a href="(?P<downurl1>.+?)" rel="external nofollow" target="_blank">酷云中国电信下载</a></li>' , htmlcontent); if (downurl1): downurl1 = downurl1.group( "downurl1" ); print "下载地址1:" ,downurl1; file_object.write( '下载地址1:' + downurl1 + 'r' ); sys.stdout.write( 'rFetching ' + title + '...n' ) title = title.replace( ' ' , ''); title = title.replace( '/' , ''); saveFile = '/Users/superl/Desktop/pythonbook/' + title + '.rar' ; if os.path.exists(saveFile): print "该文件已经下载了!" ; else : urllib.urlretrieve(downurl1, saveFile, reporthook = report); sys.stdout.write( "rDownload complete, saved as %s" % (saveFile) + 'nn' ) sys.stdout.flush() file_object.write( '文件下载成功!r' ); else : print "下载地址1不存在" ; file_error.write(url + 'r' ); file_error.write(title + "下载地址1不存在!文件没有自动下载!r" ); file_error.write( 'r' ); #<li><a href="http://pan.baidu.com/s/1pKfVNwJ" rel="external nofollow" target="_blank">百度网盘下载2</a></li> downurl2 = re.search( '</a></li><li><a href="(?P<downurl2>.+?)" rel="external nofollow" target="_blank">百度网盘下载2</a></li>' , htmlcontent); if (downurl2): downurl2 = downurl2.group( "downurl2" ); print "下载地址2:" ,downurl2; file_object.write( '下载地址2:' + downurl2 + 'r' ); else : #file_error.write(url+'r'); print "下载地址2不存在" ; file_error.write(title + "下载地址2不存在r" ); file_error.write( 'r' ); file_object.write( 'r' ); print "n" ; def getBooksUrl(url): htmlcontent = getHtml(url); #<ul class="cur-cat-list"><a href="/books/438381.html" rel="external nofollow" class="tit"</ul></div><!--end #content --> urls = re.findall( '<a href="(?P<urls>.+?)" rel="external nofollow" class="tit"' , htmlcontent); for url in urls: url = "//www.zzvips.com" + url; print url + "n" ; file_object.write(url + 'r' ); getBookInfo(url) #print "url->", url if __name__ = = "__main__" : file_object = open ( '/Users/superl/Desktop/python.txt' , 'w+' ); file_error = open ( '/Users/superl/Desktop/pythonerror.txt' , 'w+' ); pagenum = 3 ; for pagevalue in range ( 1 ,pagenum + 1 ): listurl = "//www.zzvips.com/ books/list476_%d.html" % pagevalue; print listurl; file_object.write(listurl + 'r' ); getBooksUrl(listurl); file_object.close(); file_error.close(); |
注意,上面代码部分地方的url被我换了。
总结
以上所述是小编给大家介绍的python采集jb51电子书资源并自动下载到本地实例脚本,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:http://www.topjishu.net/article/123.html