Video: Koj tuaj yeem ua dab tsi nrog lub web crawler?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Web crawlers feem ntau yog siv los tsim ib daim qauv ntawm tag nrho cov nplooj ntawv tuaj xyuas tom qab ua tiav los ntawm kev tshawb fawb cav, uas yuav index cov nplooj ntawv downloaded los muab kev tshawb nrhiav ceev. Crawlers tuaj yeem kuj yog siv rau automating txij nkawm taskson a Web site, xws li xyuas cov ntawv txuas lossis siv tau HTMLcode.
Ib yam li ntawd, lub web crawler ua haujlwm li cas?
A tus crawler yog ib qhov program uas tuaj xyuas Web cov chaw thiab nyeem lawv cov nplooj ntawv thiab lwm cov ntaub ntawv txhawm rau tsim cov ntawv nkag rau kev tshawb fawb cav index. Crawlers Thaj tau lub npe vim lawv nkag mus los ntawm ib nplooj ntawv sitea ib zaug, ua raws li cov kev txuas mus rau lwm nplooj ntawv ntawm qhov chaw mus txog rau tag nrho cov nplooj ntawv tau nyeem.
Web crawling thiab scraping yog dab tsi? Nkag mus feem ntau yog hais txog kev cuam tshuam nrog cov ntaub ntawv loj-poob uas koj tsim koj tus kheej crawlers (los yog bots) uas nkag mus mus rau qhov tob tshaj ntawm cov web nplooj ntawv. Cov ntaub ntawv khawb ntawm qhov tod tes, hais txog kev muab cov ntaub ntawv los ntawm ib qho twg (tsis tas yuav yog web ).
Ntawm no, koj tuaj yeem paub tseeb tias txhua qhov web crawlers thiab cov cuab yeej pabcuam yuav ua li cas?
Web crawlers luam cov nplooj ntawv rau ua bya tshawb fawb cav uas indexes cov nplooj ntawv rub tawm kom cov neeg siv ua tau nrhiav kom tau zoo dua. Crawlers tuaj yeem validatehyperlinks thiab HTML code. Lawv ua tau kuj tseem siv tau rau web scraping (saib cov ntaub ntawv-drivenprogramming).
Dab tsi siv tshuab tshawb fawb siv los nkag cov vev xaib bots?
Lub web crawler, los yog kab laug sab, yog ib hom bot uas yog ib txwm ua los ntawm nrhiav cav zoo li Google thiab Bing. Lawv lub hom phiaj yog txhawm rau txheeb xyuas cov ntsiab lus ntawm cov vev xaib tag nrho thoob plaws hauv Internet li ntawd cov vev xaib tuaj yeem tshwm hauv tshuab tshawb nrhiav tshwm sim.
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