1、锁定某个主题抓取；

2、能够产生日志文本文件，格式为：时间戳(timestamp)、URL；

3、抓取某一URL时最多允许建立2个连接（注意：本地作网页解析的线程数则不限）

4、遵守文明蜘蛛规则：必须分析robots.txt文件和meta tag有无限制；一个线程抓完一个网页后要sleep 2秒钟；

5、能对HTML网页进行解析，提取出链接URL，能判别提取的URL是否已处理过，不重复解析已crawl过的网页；

6、能够对spider/crawler程序的一些基本参数进行设置，包括：抓取深度(depth)、种子URL等；

7、使用User-agent向服务器表明自己的身份；

8、产生抓取统计信息：包括抓取速度、抓取完成所需时间、抓取网页总数；重要变量和所有类、方法加注释；

9、请遵守编程规范，如类、方法、文件等的命名规范，

10、可选：GUI图形用户界面、web界面，通过界面管理spider/crawler，包括启停、URL增删等

-1, the ability to lock a particular theme crawls; 2, can produce log text file format : timestamp (timestamp), the URL; 3. crawls up a URL to allow for the establishment of two connecting (Note : local website for a few analytical thread is not limited) 4, abide by the rules of civilized spiders : to be analyzed robots.txt file and meta tag unrestricted; End grasp a thread after a website to sleep two seconds; 5, capable of HTML pages for analysis, Links to extract URL, the extract can judge whether the URL have been processed. Analysis has not repeat crawl over the web; 6. to the spider / crawler some of the basic procedures for setting up parameters, including : Grasp depth (depth), seeds URL; 7. use User-agent to the server to identify themselves; 8, crawls produce statistical informati