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crawler4j is an open source webcrawler for Java which provides a simple interface for crawling the Web. Using it, you can setup a multi-threaded webcrawler in few minutes. You need to create a crawler class that extends WebCrawler. This class decides which URLs should be crawled and handles the downloaded page. shouldVisit function decides whether the given URL should be crawled or not.
The Java Sitemap Parser can parse a website's Sitemap (http://www.sitemaps.org/). This is useful for web crawlers that want to discover URLs from a website that is using the Sitemap Protocol.
This project has been incorporated into crawler-commons (https://github.com/crawler-commons/crawler-commons) and is no longer being maintained.