This project forked from wen-fei/cnkispider
a spider for cnki patent content, just for study and commucation, no use for business.
知网专利爬虫，仅用于学习交流，不做商业使用
今天同学突然告诉我爬取了100多W（我们需要爬2014年的，总共190W+），细问才知道，知网的专利详情页的url组成是有规则的。
举个例子：
对于这个某个专利的url来说，我们只要变化FileName=CN203968251U就可以了，=号后面代表的是专利公开号，专利公开号亦称专利文献号，组成方式为“国别号+分类号+流水号+标识代码”，如CN1340998A，表示**的第340998号发明专利（来自百度百科）。
假如我们需要爬取2014年的所有专利，我们可以通过搜索找到2014年1月1日（2014年非常早的一篇专利号）和2014年12月31日（2014年非常晚的一篇专利号），取中间的差值，就可以爬取绝大部分需要的专利了。
其中，CN是固定的，末尾的字母是专利标识代码，**只有ASU种
所有，避免了爬取url列表页（反爬虫严重）和复杂的验证码问题，直接构建循环爬取详情页即可。
框架使用的的Scrapy1.3，python版本3.6
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