期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2014
卷号：12
期号：3
页码：111-118
DOI：10.14445/22312803/IJCTT-V12P122
出版社：Seventh Sense Research Group
摘要：A large amount of data on the WWW remains inaccessible to crawlers of Web search engines because it can only be exposed on demand as users fill out and submit forms. The Hidden web refers to the collection of Web data which can be accessed by the crawler only through an interaction with the Webbased search form and not simply by traversing hyperlinks. Research on Hidden Web has emerged almost a decade ago with the main line being exploring ways to access the content in online databases that are usually hidden behind search forms. The efforts in the area mainly focus on designing hidden Web crawlers that focus on learning forms and filling them with meaningful values. The paper gives an insight into the various Hidden Web crawlers developed for the purpose giving a mention to the advantages and shortcoming of the techniques employed in each.
