Convert Map to JSON String To convert a Java Map to a JSON string, you can use the writeValueAsString() method from the ObjectMapper class: try { // create a map Map<String, Object> map = new HashMap<>(); map.put("name", "John Deo"); map.put("email", "john.doe@example.com...
You can convert JSON String to Java object in just 2 lines by using Gson as shown below : Gson g = new Gson(); Player p = g.fromJson(jsonString, Player.class) You can also convert a Java object to JSON by using the toJson() method as shown below String str = g.toJson(p); ...
3. Convert Map to JSON string This example converts a JavaMapto a JSON string using Jackson. MapToJsonExample.java packagecom.mkyong.json.jackson;importcom.fasterxml.jackson.core.JsonProcessingException;importcom.fasterxml.jackson.databind.ObjectMapper;importjava.util.HashMap;importjava.util.Map;public...
(employee));//The conversion methodstaticMap<String,String>convertObjectToMapUsingObjectMapper(Employeeemployee){ObjectMapperobjectMapper=newObjectMapper();objectMapper.registerModule(newJavaTimeModule());objectMapper.setDateFormat(newSimpleDateFormat("yyyy-MM-dd"));returnobjectMapper.convertValue(employee,Map....
publicclassEnumValueDeserializerextendsJsonSerializer<EnumValue>{@Overridepublicvoidserialize(EnumValue value,JsonGenerator gen,SerializerProvider serializers)throwsIOException{gen.writeString(value.enumValue().toString());}} ObjectMapper objectMapper=newObjectMapper();SimpleModule module=newSimpleModule();module.ad...
Convert JSON String to Java Map For our task status labels, let's define an Enum. We'll have a Map<String, TASK_STATUS> pair, though, you can go with any type here, really: enum TASK_STATUS { In_Progress, Done, Planned } Naturally, Jackson's key class is the ObjectMapper class ...
TypeReference<Map<String, Person>> typeReferenceMap = new TypeReference<Map<String, Person>>() {}; return new ObjectMapper().readValue(idToPersonsNode.traverse(), typeReferenceMap); } First, we create aTypeReferenceobject by passing the exact type we need to convert to. We then call thereadVal...
importcom.fasterxml.jackson.databind.ObjectMapper;importjava.io.FileInputStream;importjava.io.IOException;importjava.io.InputStream;importjava.util.HashMap;publicclassMain{publicstaticvoidmain(String[]args)throwsIOException{InputStream getLocalJsonFile=newFileInputStream("/sample.json");HashMap<String,Object...
In order to use your mapper "fromJson" method you do the following in your main function or anywhere in your dart code: import 'dart:convert'; void main(List<String> arguments) { Map<String, dynamic> map = jsonDecode([MY_JSON_STRING]); var myRootNode = Test.fromJson(map); // Acc...
{ + String base64 = Base64.getEncoder().encodeToString(di.image); + OCRSpace.key = "your key"; + OCRResult result = OCRSpace.detect(base64); + SearchablePDFCreator.addTextOverlay(contentStream,result,image.getHeight()); + }contentStream.close(); } document.save(fileToSave.getAbsolute...