jackson

问题 I am trying to create a custom annotation to tokenize a given property always when it is annotated with, so I have the following structure: @JsonComponent public class TokenSerializer { @JsonSerialize(using = IdToTokenSerializer.class) // This does not work @JsonDeserialize(using = TokenToIdDeserializer.class) // This does not work @Retention(RetentionPolicy.RUNTIME) public static @interface TokenizedId { Class<?> value(); } public static class IdToTokenSerializer extends JsonSerializer<Long>

问题 I have a controller like the following, @RequestMapping(value = "rest/v1/tester") public class TestController { @RequestMapping(value = "/search", method = RequestMethod.GET) public ResponseEntity<SampleResults> search(@ModelAttribute("criteria")SampleCriteria criteria) throws Exception { SampleResults sampleResults = sampleService.search(criteria); return new ResponseEntity<>(sampleResults, OK); } } I have another controller like so, @RequestMapping(value = "rest/v1/second") public class

问题 I'm trying to deserialize json using jackson, the problem is that field names are not always the same, for instance One call will give me { id: "blabla" aFieldname : { an object if type A} } Another call will give me { id: "blabla" anotherName : { the same kind of object } } I can't predict the name of the field. is it even possible ? 回答1: You could deserialize the JSON as a Map<String, Object> : ObjectMapper mapper = new ObjectMapper(); TypeReference<HashMap<String, Object>> typeReference =

问题 I'm trying to deserialize json using jackson, the problem is that field names are not always the same, for instance One call will give me { id: "blabla" aFieldname : { an object if type A} } Another call will give me { id: "blabla" anotherName : { the same kind of object } } I can't predict the name of the field. is it even possible ? 回答1: You could deserialize the JSON as a Map<String, Object> : ObjectMapper mapper = new ObjectMapper(); TypeReference<HashMap<String, Object>> typeReference =

问题 Im converting a json to a java object but I'm not getting what I want. I have duplicated keys "friend" in my json. My json: { "id" : "5ee2e2f780bc8e7511a65de9", "friends": [{ "friend": { "id": 1, "name": "Priscilla Lynch" }, "friend": { "id": 2, "name": "William Lawrence" } }] } Using readValue from ObjectMapper only takes the last one "friend" but I need both. I know JSONObject use Map to convert so that's why it is taking the last one. Result: Contacts(id=5ee2e2f780bc8e7511a65de9, friends=[

问题 I just updated spring boot from 1.3.2 to 1.4 and as a result also updated jackson from 2.6.5 to 2.8.1. With no other change in code jackson now tries to create instances of my model class using an all-args-constructor (AnnotatedConstructor.java:124) instead of the normal no-args-constructor (AnnotatedConstructor.java:120). Since jackson is using the constructor in the wrong order (setting a String for a Long) this results in an exception: Caused by: com.fasterxml.jackson.databind

问题 In my company we have a fixed JSON message structure: { "headerVal1": "" "headerVal2": "" "customPayload": { "payloadType":"" } } I would like to have some kind of library, which allows me, to not care for the company defined message structure, and instead just send and receive the payload. My idea was, to define the structure of the company template as one object, and use subtypes of a PayloadObject . @JsonTypeInfo( use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.MINIMAL_CLASS,

问题 I have a type from a third party library ( JSONB from jooq) that I've written a custom serializer/deserializer for: @JsonComponent public class JSONBSerializer extends JsonSerializer<JSONB> { @Override public void serialize(JSONB jsonb, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException { jsonGenerator.writeString(jsonb.toString()); } } @JsonComponent public class JSONBDeserializer extends JsonDeserializer<JSONB> { @Override public JSONB deserialize

问题 I need to parse this json: { "id":"cpd4-b39c4b2a-b5cb-4581-b519-6034aaa7fe4e", "transactionId":"768a9be4-b5b3-452f-9bd3-9fff2e9ace5c", "status":"PUBLIC", "confidential":true, "expiringAt":1231231, "locked":true, "metadata":[ { "user":"admin", "creationTimestamp":1538578453285, "value":"metadata" } ], "security":"read", "timestampCreation":1538578453285, "userCreation":"admin", "appCreation":"app", "document":{ "id":null, "transactionId":"768a9be4-b5b3-452f-9bd3-9fff2e9ace5c", "docId":

问题 I need to parse this json: { "id":"cpd4-b39c4b2a-b5cb-4581-b519-6034aaa7fe4e", "transactionId":"768a9be4-b5b3-452f-9bd3-9fff2e9ace5c", "status":"PUBLIC", "confidential":true, "expiringAt":1231231, "locked":true, "metadata":[ { "user":"admin", "creationTimestamp":1538578453285, "value":"metadata" } ], "security":"read", "timestampCreation":1538578453285, "userCreation":"admin", "appCreation":"app", "document":{ "id":null, "transactionId":"768a9be4-b5b3-452f-9bd3-9fff2e9ace5c", "docId":