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jsoup is a Javalibrary for working with real-world HTML. It provides a very convenient API for fetching URLs and extracting and manipulating data, using the best of HTML5 DOM methods and CSS selectors. jsoup implements the WHATWG HTML5 specification, and parses HTML to the same DOM as modern browsers do. jsoup is designed to deal with all varieties of HTML found in the wild; from pristine and validating, to invalid tag-soup; jsoup will create a sensible parse tree.
Simple-Scrape is a simple web-scraping library that allows for programmatic access to HTML code. No further techniques are needed and the library is very compact and thus easy to use.
Constellio is an enterprise search engine that allows companies to search all their organization's information through a single interface (Web, CRM, ERP, ECM, Mail etc.). Constellio is Based on Apache Solr and Google Search Appliance's connector. Constellio has a powerful web crawler.
The archive-crawler project is building Heritrix: a flexible, extensible, robust, and scalable web crawler capable of fetching, archiving, and analyzing the full diversity and breadth of internet-accesible content.
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This project is a java web spider (web crawler) with the ability to download (and resume) files. It is also highly customizable with regular expressions and download templates. All backend functionalities are also available in a separate library.
The DeDuplicator is an add-on module (plug-in) for the web crawler Heritrix. It offers a means to reduce the amount of duplicate data collected in a series of snapshot crawls.
J-Obey is a JavaLibrary/package, which allows people writing their own crawlers to have a stable Robots.txt parser, if you are writing a web crawler of some sort you can use J-Obey to take out the hassle of writing a Robots.txt parser/intrepreter.
A Java implementation of a flexible and extensible web spider engine.
Optional modules allow functionality to be added (searching dead links, testing the performance and scalability of a site, creating a sitemap, etc ..
WebSPHINX is a web crawler (robot, spider) Java class library, originally developed by Robert Miller of Carnegie Mellon University. Multithreaded, tollerant HTML parsing, URL filtering and page classification, pattern matching, mirroring, and more.
Spider is web crawler written in the Java.Based on an Regular expression string the spider parses the internet for web pages matching this string and stores it in an MYSQL database.