This is a basic Webcrawler.

How to Run -->
1) make sure you have all the dependencies in place. 
    a) Jsoup(1.8.2) - for URL handeling
    b) Gson(2.2.4) - To convert to json format.
    c) apache common validator(1.4.1) - to validate the url

2) Compile WebCrawler.java --> javac WebCrawler.java 

3) Run WebCrawler with following arguments
    1) start url (Optional)
    2) Number of Hops (Optional)
    3) Output format (Optional)