Video: Dab tsi yog qhov kev thov getParameter hauv JSP?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
getParameter () - Hla cov ntaub ntawv los ntawm tus neeg siv khoom mus rau JSP
Kev paub ntawm cov getParameter () txoj hauv kev tau txais cov ntaub ntawv, tshwj xeeb tshaj yog cov ntaub ntawv, los ntawm tus neeg siv nplooj ntawv HTML mus rau a JSP nplooj yog dealt nrog no. Cov thov . getParameter () ua siv ntawm no los khaws cov ntaub ntawv los ntawm cov neeg siv khoom sab.
Tom qab ntawd, qhov kev thov getParameter ua li cas?
getParameter () txoj kev yog siv kom tau tus nqi parameter txuam nrog thov khoom ntawm HTML daim ntawv teb. Cov nqi teb no muaj feem cuam tshuam rau HTTP thov tom qab xa daim ntawv. Txoj kev no xa rov qab tus nqi String yog tias qhov kev thov tsis muaj nyob lossis rov qab tsis tau yog tias qhov kev thov tsis muaj nyob.
Kuj Paub, daim ntawv txiav txim ua dab tsi hauv JSP? jsp ua file muaj a daim ntawv raws li nws lub ntsiab tseem ceeb. Cov daim ntawv yog txhais nrog Struts html: daim ntawv tag. Cov kev ua attribute ntawm html: daim ntawv element qhia cov kev ua rau qhov daim ntawv xa tuaj. Cov kev ua yog txheeb xyuas los ntawm txoj kev attribute ntawm nws kev ua configuration element.
Ib yam li ntawd, nws tau nug, qhov kev thov hauv JSP yog dab tsi?
JSP thov yam khoom. Cov JSP thov yog ib qho khoom siv tsis raug ntawm hom HttpServletRequest piv txwv li tsim rau txhua tus jsp xav los ntawm lub vev xaib. Nws tuaj yeem siv tau thov cov ntaub ntawv xws li parameter, header information, remote address, server name, server port, content type, character encoding thiab lwm yam.
Yuav ua li cas hla tus nqi ntawm ib daim ntawv mus rau lwm qhov hauv JSP?
Ntawm no hauv JSP (Java Server Pages) peb tuaj yeem ua tau dhau qhov nqi los ntawm ob txoj kev: Ua ntej, yog tias peb yuav tsum tsuas yog kis tus nqi los ntawm ib qho paj to lwm nplooj ntawv sib law liag uas raug hu ces peb tau txais cov no tus nqi los ntawm kev siv cov khoom implicit thov hu rau txoj kev thov. getAttribute(" parameter npe").
Pom zoo:
Dab tsi yog qhov sib txawv loj ntawm kev txheeb xyuas qhov yuam kev thiab kev kho cov lej yuam kev?
Ob qhov kev tshawb nrhiav qhov yuam kev thiab kev kho qhov yuam kev yuav tsum muaj qee qhov ntawm cov ntaub ntawv rov qab xa mus nrog cov ntaub ntawv tiag tiag; kev kho yuav tsum muaj ntau tshaj li kev tshawb nrhiav. Parity bits yog ib txoj hauv kev yooj yim rau kev tshawb nrhiav qhov yuam kev. Ib qho parity me ntsis yog ib qho ntxiv me ntsis xa nrog cov ntaub ntawv uas tsuas yog 1-ntsis suav ntawm cov ntaub ntawv
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Dab tsi yog qhov dav thawj qhov kev tshawb nrhiav thiab qhov tob thawj qhov kev tshawb fawb?
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Dab tsi yog qhov txawv ntawm kev thov synchronous thiab asynchronous thov?
Synchronous: Ib qho kev thov synchronous thaiv tus neeg siv khoom kom txog thaum ua haujlwm tiav. Asynchronous Ib qho kev thov asynchronous tsis thaiv tus neeg siv khoom xws li browser teb. Lub sijhawm ntawd, tus neeg siv tuaj yeem ua lwm yam haujlwm. Hauv qhov xwm txheej zoo li no, javascript cav ntawm browser tsis raug thaiv
Lub luag haujlwm ntawm daim ntawv thov kev pab cuam hauv DBMS txoj hauv kev yog dab tsi?
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