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！
实例采集并下载天达云的python栏目电子书资源：
# -*- 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
#<h2 class="h2user">crifan</h2>
regex_title = '<h2s+?itemprop="name">(?P<title>.+?)</h2>';
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.jb51.net"+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.jb51.net/ 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天达云网站的支持！