jackson-databind

问题 I have sample json data like below {"data":{"detection":[{"category":"building","coordinates":{"xmin":"0.31","ymin":"0.42","ymax":"0.82","xmax":"0.89"},"accuracy":"0.66"}]}} Trying to parse data field in jackson parser and created ObjectCategories class(setter getter) for its values. @JsonProperty("categories") private List<ObjectCategory> categories; @SuppressWarnings("unchecked") @JsonProperty(DATA) private void unpackNested(Map<String,Object> data) { this.categories = (ArrayList

问题 We are working in an backend application in which we use Protobuffers as model/pojo files. We have to call an API which returns a response as a JSON. message Example{ string id = 1; string another_id = 2; int32 code = 3; string name = 4; Timestamp date =5; } Now we need to call an API which returns response in JSON: { "json_id":"3", "json_another_id":"43", "code":34, "json_name":"Yeyproto", "json_date":"2018-01-01T10:00:20.021-05:00" } I am mapping the response(which is in json) directly with

问题 We are working in an backend application in which we use Protobuffers as model/pojo files. We have to call an API which returns a response as a JSON. message Example{ string id = 1; string another_id = 2; int32 code = 3; string name = 4; Timestamp date =5; } Now we need to call an API which returns response in JSON: { "json_id":"3", "json_another_id":"43", "code":34, "json_name":"Yeyproto", "json_date":"2018-01-01T10:00:20.021-05:00" } I am mapping the response(which is in json) directly with

问题 I need to send a JSON body to REST service. Unfortunately, service is quite old and I need to send a POJO, containing JSON string field. So it looks like this: class SomeData { int id; SomePojo jsonField; ... } So SomeData should be sent like this: {'id': 1, 'jsonField': some_json_string} I haven't found any Jackson magic annotation to make it works and I've got a doubt it can be made somehow because of type erasure in Java and it may not be possible to write custom serializer for this

问题 Here is the class that I want to serialize. public class ItemRow<T> { private String id; private List<T> items; } There are two variations that are allowed. ItemRow<String>, ItemRow<ItemRow> . In the latter case, it will be nested. eg: ItemRow item1 = new ItemRow("abc", Arrays.asList("item1", "item2", "item3")); String result = mapper.writeValueAsString(item1); System.out.println(result); should give { "abc":["item1","item2","item3"] } Now, the latter case ItemRow item2 = new ItemRow("cde",

问题 My class looks like this class Foo { int x; public void setX(int x){ this.x=x; } public int getX(){ return x; } public int getDoubleX(){ return x*2; } } When serializing the class to JSON using Jackson I get an error: **JSON parse error: Unrecognized field "doubleX"** I tried annotating with @JsonGetter but that did not work. The only thing that seems to work with Jackson is to create a setter that does nothing and annotate it with @JsonIgnore . 回答1: Use @JsonIgnoreProperties annotation:

问题 I have a working spring boot application that uses JSON as exchange data format. Now I had to add a service that sends their data only in xml. I added jackson-dataformat-xml to my pom and it worked perfectly. @Service public class TemplateService { private final RestTemplate restTemplate; private final String serviceUri; public TemplateService (RestTemplate restTemplate, @Value("${service.url_templates}") String serviceUri) { this.restTemplate = restTemplate; this.serviceUri = serviceUri; }

问题 I'm working on native C++ development and looking for JSON parser that can handle complex JSON files and convert into class objects. I've looked at native benchmarks for JSON parsers available in C++ and came to conclusion that RapidJSON is popular and best fit considering processing time and size handling. My requirement is to convert JSON objects to user defined classes and vice versa. The Jackson has Objectmapper class that provides functionality for reading and writing JSON, either to and

问题 i want to change the date format in a json that is delivered by a java rest webservice, that is because the json have the dates like this: 2019-05-23T06:00:00Z[UTC] , so the client confuse the [UTC] with an array, because of the '[' and ']' im using glassfish 5 ,jax-rs , jackson 2.9.4 databind, . i have tried to use @JsonSerialize(using = CustomXSerializer.class) in the model object and didn work, also @JsonFormat(shape= JsonFormat.Shape.STRING, pattern="MM-dd-yyyy",timezone="CET") in the

问题 I need to deserialize a flat JSON object to a Java object with some properties set to child object. { "name": "abcd", "addressLine1": "123", "addressLine2": "1111" } Class Student { String name; Address address; } Class Address { String line1; String line2; } How do I deserialize my JSON using Jackson into a Student object? I am not able to map addressLine1 to Student.Address.line1 and addressLine2 to Student.Address.line2 回答1: You can define your data classes this way: public static class