jackson2

问题 As per JSON specification, I am aware that leading zeroes are not allowed in integers in JSON. But as per Jackson documentation, there is a property in Jackson library i.e. ALLOW_NUMERIC_LEADING_ZEROS which when enabled, does not throw exceptions when leading zeroes are found. I enabled the property ALLOW_NUMERIC_LEADING_ZEROS by setting following property and still I am getting error: Leading zeroes not allowed . spring.jackson.parser.ALLOW_NUMERIC_LEADING_ZEROS=true Relevant Logs: Caused by

问题 I am just trying to make a simple REST request like below String url = "some url"; MultiValueMap<String, String> headers = new LinkedMultiValueMap<>(); headers.add(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE); headers.add(HttpHeaders.AUTHORIZATION, "some authorization"); RestTemplate restTemplate = new RestTemplate(); restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter()); Body body = new Body(); body.setRemarks("test"); org.springframework.http

问题 I have the following JSON: {"beans":["{}",{"name":"Will"}]} and the corresponding POJO classes: public class BeanA { private BeanB[] beans; ...getters/setters } public class BeanB { private String name; ...getters/setters } I would like jackson to deserialize to BeanA with an array of BeanBs, the first element would be just an instance of BeanB and the second with be an instance of BeanB with the name property set. I've created the original string by serializing this: BeanA beanA = new BeanA(

问题 I have a controller whose response is camelCase json value. Now we are re-writing the code with new version and the response required is in snake_case. I have added a message converter and modified object mapper to set setPropertyNamingStrategy(PropertyNamingStrategy.CAMEL_CASE_TO_LOWER_CASE_WITH_UNDERSCORES); public class ResponseJSONConverter extends MappingJackson2HttpMessageConverter { @Autowired public ResponseJSONConverter(ObjectMapper objectMapper) { setObjectMapper(objectMapper); } }

问题 I recently tried to implement a micro service using spring-boot 2. Now, whenever I attempt to return an object which contains a java.time.LocalDateTime from my REST service, the LocalDateTime get serialized as an array of integers. Like so: { "id": "5bf1425f9f8de267f04b22ad", "description": "aaaaaarrrgggghhhhh", "timestamp": [ 2018, 11, 18, 11, 43, 43, 889000000 ], "time": 2.25, ... } I have tried configuring the ObjectMapper through settings in application.yml spring: jackson: serialization:

问题 I have JsonNode result that I want to print out. So far, I am using: ObjectMapper mapper = new ObjectMapper(); mapper.enable(SerializationFeature.INDENT_OUTPUT); File outputFile = new File( getCurOutputDir(), String.format("out.json", getClass().getSimpleName()) ); mapper.writeValue(new FileOutputStream(outputFile), resultNode); which outputs something like: { "A" : [ { "Ai" : { "Ai1" : 42, "Ai2" : 55 } } ], "B" : [ 86 ] } but I need it to be in this specific format: { "A" : [ { "Ai" : { "Ai1

问题 I have a below JSON response that I am getting back from a rest service. Now I need to deserialize below JSON response into a POJO. I am working with Jackson. { "pagination": { "number": 1, "entriesPerPage": 200, "total": 3 }, "postings": [{ "categories": [{ "taskid": "79720", "name": "Sunglasses", "parentCategory": { "taskid": "394", "name": "Sunglasses & Fashion Eyewear", "parentCategory": { "taskid": "2340", "name": "Men's Accessories", "parentCategory": { "taskid": "10987", "name":

问题 @JsonIgnoreProperties(ignoreUnknown=false) is not working with spring 4.2.0 and upper version of spring. But it is working with 4.0.4 and 4.0.1 . I am using spring 4.2.8 and Jackson dependencies are used <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.6.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.6.3</version> </dependency> <dependency>

问题 @JsonIgnoreProperties(ignoreUnknown=false) is not working with spring 4.2.0 and upper version of spring. But it is working with 4.0.4 and 4.0.1 . I am using spring 4.2.8 and Jackson dependencies are used <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.6.3</version> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.6.3</version> </dependency> <dependency>

问题 I have a 'Example' Pojo class as mentioned below. Can any one tel to save instance of Example class to YAML file using Jackson. public class Example { String name; int value; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getValue() { return value; } public void setValue(int value) { this.value = value; } } 回答1: Jackson has a module that supports YAML. Ensure that you add the required dependency to your project, then you can use it