Video: ObjectMapper readValue ua dab tsi?
2024 Tus sau: Lynn Donovan | [email protected]. Kawg hloov kho: 2023-12-15 23:47
Lub Jackson ObjectMapper tuaj yeem parse JSON los ntawm ib txoj hlua, kwj lossis cov ntaub ntawv, thiab tsim cov khoom Java lossis cov duab kos uas sawv cev rau JSON parsed. Parsing JSON rau hauv Java khoom yog tseem hu ua deserialize Java khoom los ntawm JSON. Lub Jackson ObjectMapper tuaj yeem kuj tsim JSON los ntawm Java khoom.
Raws li, kev siv ObjectMapper yog dab tsi?
ObjectMapper yog chav kawm tseem ceeb ntawm Jackson lub tsev qiv ntawv. ObjectMapper chav kawm ObjectMapper muab kev ua haujlwm rau kev nyeem ntawv thiab sau JSON, xws li mus rau thiab los ntawm POJOs (Plain Old Java Yam khoom), lossis mus rau thiab los ntawm lub hom phiaj JSON Tsob Ntoo Model (JsonNode), nrog rau kev ua haujlwm muaj feem xyuam rau kev hloov pauv.
Tsis tas li ntawd, ObjectMapper puas tuaj yeem nyeemValue rov null? 1 Teb. nyeemValue () rov null rau JSON cov tswv yim suav nrog JSON tus nqi null . Nws ua tsis yog rov null rau lwm qhov xwm txheej: cov tswv yim uas ploj lawm (piv txwv li) yuav tau txais txiaj ntsig los ntawm kev zam; thiab tsis muaj deserializer tsim null los ntawm lub neej ntawd.
Cov lus nug tseem yog, REST API ObjectMapper yog dab tsi?
Interface ObjectMapper Ib khoom mapper yog siv los serialize thiab deserialize ib yam khoom Java rau thiab los ntawm ib txoj hlua, byte lossis InputStream. REST Assured muab mappers rau XML thiab JSON tawm ntawm lub npov (saib ObjectMapperType) tab sis koj tuaj yeem siv qhov kev sib tshuam no los yob koj tus kheej mapper siv rau cov qauv kev cai.
Puas yog ObjectMapper xov zoo?
Lawv tag nrho tsis hloov, xov - nyab xeeb , txhais hais tias nws tsis yog txawm theoretical ua tau los ua xov - kev nyab xeeb teeb meem (uas tuaj yeem tshwm sim nrog ObjectMapper yog tias code sim rov teeb tsa piv txwv).
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