如何JSON使用閱讀下面的內(nèi)容Jackson ObjectMapper？我已經(jīng)開(kāi)發(fā)了代碼，但出現(xiàn)以下錯(cuò)誤。com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.util.ArrayList` out of START_OBJECT token at [Source: (File); line: 7, column: 19] (through reference chain: com.example.demo.resources.Orgnization["secondaryIds"])JSON{ "id": "100000", "name": "ABC", "keyAccount": false, "phone": "1111111", "phoneExtn": "11", "secondaryIds": { "ROP": [ "700010015", "454546767", "747485968", "343434343" ], "AHID": [ "01122006", "03112001" ] }}
1 回答
慕桂英546537
TA貢獻(xiàn)1848條經(jīng)驗(yàn) 獲得超10個(gè)贊
您需要啟用ACCEPT_SINGLE_VALUE_AS_ARRAY功能。可能在POJO你有一個(gè)List但是當(dāng)有效負(fù)載中只有一個(gè)元素時(shí)List?JSON生成的沒(méi)有數(shù)組括號(hào)。
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.File;
import java.util.List;
public class JsonApp {
? ? public static void main(String[] args) throws Exception {
? ? ? ? File jsonFile = new File("./src/main/resources/test.json");
? ? ? ? ObjectMapper mapper = new ObjectMapper();
? ? ? ? mapper.enable(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY);
? ? ? ? Orgnization root = mapper.readValue(jsonFile, Orgnization.class);
? ? ? ? System.out.println(root);
? ? }
}
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