java - What is the best way to check each link of a website? -

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I want to create a crawler that follows every link on a site, and the URL checks to see if it Works or not. Now my code is url.openStream () .

, what is the best way to create a crawler?

Use an HTML parser. 

 set  & lt; String & gt; Valid links = new hashset & lt; String & gt; (); Set up & lt; String & gt; InvalidLinks = NewHashet & lt; String & gt; (); Document Document = Jsoup.connect ("http://example.com") .get (); Element link = document. Select ("a"); (String link: links) {string url = link.bsr ("href"); If (! Legitimate link link (url) & illegal link link (url)) {iit status code = jsoup.connect (url) .execute (). Statuscode (); If (200 & lt; = statusCode & amp; status code & lt; 400) {validLinks.add (url); } And {invalidLinks.add (url); }} Hold (exception e) {invalidLinks.add (url); }}}   
 You want to send a HEAD instead of that loop to make it more efficient, but then you instead use  URLConnection  as Jason Do not support it by design (a HEAD does not give any content)

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