是有关网络爬虫技术方面的知识，详细的描述了爬虫原理及爬取策略。-This PPT is about the web crawler technology, knowledge, a detailed descr iption of the reptiles crawling principles and strategies.

是网络爬虫方面的PDF格式的文档资料，主要介绍了爬网方面的技术原理及代码示例，涉及到JAVA方面的线程知识。-Reptiles in the network documentation in PDF format, focuses on the crawl technical principles and code samples, related to the knowledge of JAVA in the thread.