The paperanalyzes typicalopen sourceWeb crawl software, such asNutch, Heritrix, WCT, andWeb-Har- vest. Following the analyzed result, itputs forward a targetedwebsitesharvestsystem based onNutch. Fourkey issues of this system are discussed emphatically, which are the initial seedwebsites selection, the harvestprocessmanagement, the web page contentdenoising, and discovering ofnew seedwebsites.

Nutch-Web.caj

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