Video: Inject annotation yog dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Cov @ Txhaj annotation cia peb txhais ib qho txhaj tshuaj point yog txhaj thaum lub sij hawm taum instantiation. Txhaj tshuaj tuaj yeem tshwm sim ntawm peb lub tshuab sib txawv. Taum constructor parameter txhaj tshuaj : public class Checkout { tus kheej zaum kawg ShoppingCart laub; @ Txhaj.
Tsuas yog li ntawd, javax txhaj tshuaj yog dab tsi?
Kev piav qhia. Txhaj . Txheeb xyuas cov tshuaj txhaj tshuaj, cov txheej txheem, thiab cov teb. Lub npe. Txoj hlua-raws li kev tsim nyog.
Ib tug kuj yuav nug, qhov txawv ntawm @autowired thiab @inject yog dab tsi? Koj tuaj yeem sau cov lus teb thiab tus tsim qauv siv @ Autowired mus qhia Spring moj khaum nrhiav kev vam meej rau koj. Cov @ Txhaj annotation kuj pab tib lub hom phiaj, tab sis lub ntsiab qhov sib txawv ntawm lawv yog @ Txhaj yog tus qauv annotation rau kev vam khom txhaj tshuaj thiab @ Autowired yog caij nplooj ntoos hlav tshwj xeeb.
Tsis tas li lo lus nug yog, dab tsi yog ob lub ntsiab lus siv los txhaj tshuaj tiv thaiv?
1. Txheej txheem cej luam. Kab lus Caij Nplooj Ntoos Hlav no yuav qhia txog kev siv cov lus piav qhia ntsig txog kev vam meej txhaj tshuaj , uas yog @Resource, @ Txhaj , thiab @Autowired cov lus piav qhia . Cov no cov lus piav qhia muab cov chav kawm nrog txoj kev tshaj tawm los daws kev vam khom.
Dab tsi yog kev txhaj tshuaj tiv thaiv nrog piv txwv?
Hauv software engineering, kev vam meej txhaj tshuaj yog ib txoj kev uas ib yam khoom muab cov kev vam khom ntawm lwm yam khoom. A " kev vam khom " yog ib yam khoom uas yuav siv tau, rau piv txwv raws li kev pabcuam. Hloov chaw tus neeg siv khoom qhia qhov kev pabcuam twg nws yuav siv, qee yam qhia tus neeg siv khoom siv qhov kev pabcuam twg.
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