Develop a Web Crawler to get forms

Develop a webcrawler that goes through websites and identifies websites that have forms(any kinds of forms - like application forms, airline forms, survey forms, login forms etc) in [login to view URL] results that is the location at which the form has been found should be stored in a text file. Also, a hash table has to be maintained that saves the websites that have been visited and checks through the hash table everytime a new website is to be traversed.