网络爬虫应该选择 Nutch、Crawler4j、WebMagic、scrapy、WebCollector 还是选择其他？
 
网络爬虫我们可以分为三大类型：
 （1）分布式爬虫：Nutch
 
（2）JAVA爬虫：Crawler4j、WebMagic、WebCollector
 
（3）非JAVA爬虫：scrapy（基于Python语言开发）
 
网络爬虫采集数据过程中，经常会遇到被反爬虫机制限制，最常见的就是ip被限制，网站根据ip的访问频率来识别
 
判断爬虫，当相同的ip频繁的对目标服务器进行访问，那么就会触发服务器的反爬虫机制，这个时候ip就会被限制
 
或者无法进行访问，爬虫工作将无法继续进行，因此需要借用到万变ip代理来突破ip的限制。

  查看全部

针对一些JS网页，动态网页在源码中无法看到它的内容，可以通过抓包分析出其JSON格式的数据。 网页通过通过这些JSON数据对网页的内容进行填充，然后就看到网页里显示相关的内容了。
 
使用过chrome，firefox，wireshark来抓过包，比较方便的是chrome，不需要安装第三方的其它插件，不过打开新页面的时候又要重新开一个捕捉页面，会错过一些实时的数据。 
 
wireshark需要专门掌握它自己的过滤规则，学习成本摆在那里。 
 
最好用的还是firefox＋firebug第三方插件。
 
接下来以拉勾网为例。
 
打开firebug功能
 
www.lagou.com 在左侧栏随便点击一个岗位，以android为例 
 





 
在firebug中，需要点击“网络”选项卡，然后选择XHR。
 





 
Post的信息就是我们需要关注的，点击post的链接
 





 
点击了Android之后 我们从浏览器上传了几个参数到拉勾的服务器
一个是 first ＝true， 一个是kd ＝ android， （关键字） 一个是pn ＝1 （page number 页码）
 
所以我们就可以模仿这一个步骤来构造一个数据包来模拟用户的点击动作。post_data = {'first':'true','kd':'Android','pn':'1'}
然后使用python中库中最简单的requests库来提交数据。 而这些数据 正是抓包里看到的数据。import requests

url = "http://www.lagou.com/jobs/posi ... ot%3B
return_data=requests.post(url,data=post_data)
print return_data.text

呐，打印出来的数据就是返回来的json数据{"code":0,"success":true,"requestId":null,"resubmitToken":null,"msg":null,"content":{"pageNo":1,"pageSize":15,"positionResult":{"totalCount":5000,"pageSize":15,"locationInfo":{"city":null,"district":null,"businessZone":null},"result":[{"createTime":"2016-05-05 17:27:50","companyId":50889,"positionName":"Android","positionType":"移动开发","workYear":"3-5年","education":"本科","jobNature":"全职","companyShortName":"和创（北京）科技股份有限公司","city":"北京","salary":"20k-35k","financeStage":"上市公司","positionId":1455217,"companyLogo":"i/image/M00/03/44/Cgp3O1ax7JWAOSzUAABS3OF0A7w289.jpg","positionFirstType":"技术","companyName":"和创科技（红圈营销）","positionAdvantage":"上市公司，持续股权激励政策，技术极客云集","industryField":"移动互联网 · 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18:30:16","companyId":50889,"positionName":"Android","positionType":"移动开发","workYear":"3-5年","education":"本科","jobNature":"全职","companyShortName":"和创（北京）科技股份有限公司","city":"北京","salary":"20k-35k","financeStage":"上市公司","positionId":1440576,"companyLogo":"i/image/M00/03/44/Cgp3O1ax7JWAOSzUAABS3OF0A7w289.jpg","positionFirstType":"技术","companyName":"和创科技（红圈营销）","positionAdvantage":"上市公司，持续股权激励政策，技术爆棚！","industryField":"移动互联网 · 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在XHR中点击JSON，就可以看到浏览器返回来的数据了。 是不是跟上面使用python程序抓取的一样呢？
 





 
是不是很简单？
 
如果想获得第2页，第3页的数据呢？
 
只需要修改pn＝x 中的值就可以了。post_data = {'first':'true','kd':'Android','pn':'2'} ＃获取第2页的内容
如果想要获取全部内容，写一个循环语句就可以了。
 
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  查看全部

post_data = {'first':'true','kd':'Android','pn':'1'}

import requests



url = "http://www.lagou.com/jobs/posi ... ot%3B

return_data=requests.post(url,data=post_data)

print return_data.text

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post_data = {'first':'true','kd':'Android','pn':'2'} ＃获取第2页的内容